Tibial Plateau Fracture

1. Clinical Overview

Summary

Tibial plateau fractures are complex intra-articular injuries of the proximal tibia, representing approximately 1% of all fractures and 8% of fractures in elderly patients. [1] These injuries result from a combination of axial loading (compressive force) and varus/valgus stress (angular deformity), classically described as the "hammer and chisel" mechanism. The injury pattern demonstrates a bimodal age distribution: high-energy trauma (motor vehicle accidents, falls from height) in younger patients with good bone quality, and low-energy falls in osteoporotic elderly patients. [2]

The cornerstone of classification remains the Schatzker system (Types I-VI), though modern CT-based classifications like the AO/OTA and Three-Column concept provide enhanced surgical planning capabilities. [3,4] Management is strictly dictated by the condition of the soft tissue envelope - a principle that cannot be overstated in proximal tibial trauma. High-energy bicondylar fractures (Schatzker V/VI) represent soft tissue emergencies requiring immediate staged management with temporary spanning external fixation ("Span, Scan, Plan") until soft tissue swelling resolves, typically 10-14 days when the "Wrinkle Sign" appears. [5,6]

Low-energy, minimally displaced fractures may be managed conservatively with protected weight-bearing, while displaced intra-articular fractures require anatomical reduction and stable internal fixation to minimize the risk of post-traumatic osteoarthritis. [7] The proximal tibia's precarious soft tissue coverage demands meticulous surgical timing and technique to avoid catastrophic wound complications.

Key Facts

• Epidemiology: Incidence of 10.3 per 100,000 population per year, with female predominance in elderly cohorts due to osteoporosis. [1]
• Most Common Pattern: Lateral plateau fractures (Schatzker II - split-depression) account for 55-70% of cases, reflecting the physiologic valgus alignment of the knee that predisposes the lateral plateau to compressive loading. [8]
• Soft Tissue Envelope: The proximal tibia has minimal subcutaneous tissue coverage anteriorly. Premature surgery through edematous skin increases infection risk 10-fold. [9]
• Lipohemarthrosis: A fat-fluid level on horizontal beam lateral radiograph (marrow fat floating on hemarthrosis) is pathognomonic for intra-articular fracture, even when fracture lines are radiographically occult. [10]
• Associated Injuries: Meniscal tears occur in 47-91% of plateau fractures, lateral meniscus more commonly affected. Ligamentous injuries (ACL/PCL/collaterals) occur in 20-30% of cases, particularly with medial plateau and bicondylar patterns. [11,12]
• Neurovascular Injury: Common peroneal nerve palsy occurs in 2-10% (higher in Schatzker IV), while popliteal artery injury is rare but must be excluded in high-energy bicondylar fractures and knee dislocations. [13]

Clinical Pearls

"Span, Scan, Plan": The mantra for high-energy tibial plateau fractures (Schatzker V/VI) with severe soft tissue injury:

1. Span: Apply knee-spanning external fixator (distal femur to proximal tibia) to restore length, alignment, and ligamentotaxis.
2. Scan: Obtain CT scan (once swelling reduced) to map articular fragments and plan definitive fixation.
3. Plan: Wait 10-14 days for "Wrinkle Sign" (skin wrinkling indicating resolution of edema) before performing ORIF.

"Beware the Medial Fracture": Schatzker Type IV (isolated medial plateau) is the "fracture of dislocation," requiring high-energy varus force. It has the highest rate of neurovascular injury and often indicates posterolateral corner disruption with common peroneal nerve palsy.

"The Rafting Screw Technique": Modern periarticular plating systems utilize multiple horizontal screws placed immediately subchondral to the articular surface, acting like floor joists or a "raft" to support elevated and reduced articular fragments and prevent subsidence.

"The Wrinkle Sign is Your Friend": Do not operate through tense, edematous skin. Wait until the skin demonstrates fine wrinkling, indicating resolution of edema and reduced risk of wound dehiscence and infection. This typically occurs 10-21 days post-injury. [6]

"Posterior Column - Out of Sight, Out of Mind": Posterior articular fragments are invisible on AP radiographs but common (30-40% of plateau fractures). Always obtain CT imaging and consider posterolateral or posteromedial approaches for adequate fixation. [14]

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2. Epidemiology

Demographics

• Incidence: 10.3 per 100,000 population annually, representing 1% of all fractures and 8% of fractures in the elderly. [1]
• Age Distribution: Bimodal.
  • Young Adults (20-40 years): Predominantly male, high-energy mechanisms (motor vehicle accidents, falls from height, sports injuries).
  • Elderly (\u003e60 years): Female predominance (3:1), low-energy falls related to osteoporosis.
• Gender: Overall slight male predominance (1.2:1), but reverses in elderly cohort due to osteoporotic fractures in women. [2]

Mechanism of Injury

The fracture pattern is determined by bone quality, energy of injury, and direction of force:

• Axial Loading: Drives femoral condyle into tibial plateau, causing articular depression.
• Valgus Force: Lateral plateau fracture (most common). Classic "bumper injury"

• pedestrian struck from lateral side.

• Varus Force: Medial plateau fracture (high-energy, associated ligamentous injury).
• Combined Axial + Rotational: Bicondylar fractures with metaphyseal extension.

Energy Classification

• Low Energy: Ground-level falls in osteoporotic bone. Typically Schatzker I-III (lateral plateau). Better soft tissue envelope.
• High Energy: Motor vehicle accidents, falls from height, high-velocity sports. Schatzker IV-VI. Severe soft tissue injury, higher complication rates.

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3. Pathophysiology

Anatomy of the Proximal Tibia

The tibial plateau consists of medial and lateral articular surfaces with distinct anatomical and biomechanical properties:

Osseous Anatomy:

• Lateral Plateau: Convex superior surface, positioned 5mm higher than medial plateau. Weaker trabecular bone density. More mobile (accommodates femoral rollback).
• Medial Plateau: Concave superior surface, larger surface area, stronger trabecular bone (requires higher energy to fracture). Bears 60-70% of axial load in knee extension. [15]
• Intercondylar Eminence: Central tibial spine with anterior and posterior tubercles (ACL and PCL attachments).
• Posterior Slope: Normal posterior tibial slope 7-10 degrees. Loss of slope (posterior plateau depression) increases ACL strain and contributes to instability.

Soft Tissue Envelope:

• Anterior Coverage: Minimal subcutaneous tissue over anteromedial tibia. Periosteum and skin only.
• Blood Supply: Anterior and posterior tibial arteries provide periosteal and endosteal blood supply. Stripping periosteum during ORIF compromises healing.
• Menisci: Lateral meniscus more mobile, peripheral attachments prone to injury with lateral plateau fractures. Medial meniscus more firmly attached, fewer tears unless high-energy injury.
• Ligaments:
  • ACL: Tibial spine avulsion occurs in 10-25% of plateau fractures.
  • MCL: Associated with lateral plateau fractures (valgus mechanism).
  • LCL/Posterolateral Corner: Associated with medial plateau fractures (varus mechanism). Common peroneal nerve at risk.
• Neurovascular Structures:
  • Popliteal Artery: Tethered proximally at adductor hiatus and distally at soleus arch. Vulnerable to injury with knee dislocation or severe displacement.
  • Common Peroneal Nerve: Winds around fibular neck. Vulnerable to traction injury in posterolateral corner injuries and Schatzker IV fractures.

Fracture Classification Systems

Schatzker Classification (1979) - The Gold Standard

Based on AP radiograph appearance. Most widely used system: [3]

• Type I: Lateral Split (Wedge): Pure cleavage fracture of lateral plateau without depression. Occurs in younger patients with strong trabecular bone. Femoral condyle acts as wedge splitting lateral cortex. Vertical fracture line. Treatment: Percutaneous screw fixation.

• Type II: Lateral Split-Depression: Most common pattern (55-70%). Occurs in middle-aged bone. Lateral cortex splits (wedge fragment) and underlying cancellous bone depresses. Combined shear and axial loading mechanism. Treatment: ORIF with elevation of depressed fragments, bone grafting, and buttress plating.

• Type III: Pure Lateral Depression: Osteoporotic bone. Central or lateral plateau depressed below level of surrounding articular surface. Lateral cortex intact. Axial loading only. Treatment: Percutaneous elevation and bone grafting vs ORIF if \u003e10mm depression.

• Type IV: Medial Plateau: High-energy varus force required. "Fracture of dislocation." Often extends into intercondylar eminence. Associated ligamentous injury (LCL, posterolateral corner, cruciates). Highest risk of neurovascular injury (common peroneal nerve, popliteal artery). Treatment: ORIF with medial buttress plate, assess for posterolateral corner injury.

• Type V: Bicondylar: Both medial and lateral plateaus fractured. Metaphyseal component intact (inverted "Y" or "T" configuration). High energy. Treatment: Dual plating (medial + lateral) or lateral locked plate with medial screws.

• Type VI: Bicondylar with Metaphyseal Dissociation: Complete dissociation of articular surface from tibial shaft. Severe soft tissue injury. "Floating plateau." Often requires damage control with spanning external fixation. Treatment: Staged management - temporary external fixation → delayed ORIF with dual plating or ring fixation.

AO/OTA Classification (41-B and 41-C)

More comprehensive, based on severity and prognosis:

• 41-B: Partial articular (one condyle).
  • B1: Pure split.
  • B2: Pure depression.
  • B3: Split-depression.
• 41-C: Complete articular (bicondylar).
  • C1: Simple articular, simple metaphyseal.
  • C2: Simple articular, multifragmentary metaphyseal.
  • C3: Multifragmentary articular.

Three-Column Concept (Luo et al, 2010)

CT-based classification addressing posterior column fractures invisible on AP radiographs: [4]

1. Lateral Column: Most common, accessible via anterolateral approach.
2. Medial Column: Requires anteromedial or posteromedial approach.
3. Posterior Column: Invisible on AP views. Requires CT for identification. 30-40% of plateau fractures involve posterior column. Requires posterolateral or posteromedial approach for fixation.

The three-column concept changed surgical planning by recognizing that:

• Posterior fragments cannot be adequately reduced or fixed through anterior approaches.
• Failure to fix posterior column leads to loss of reduction and posteromedial instability.
• CT imaging is mandatory for operative planning.

Mechanism of Articular Cartilage Damage

The compressive forces that cause tibial plateau fractures simultaneously damage articular cartilage through:

1. Direct Impact Injury: Femoral condyle crushes tibial plateau cartilage at moment of injury. Chondrocyte death occurs immediately.
2. Articular Step-Off: Incongruent joint surface creates focal stress concentrations and accelerates cartilage degeneration.
3. Meniscal Injury: Loss of meniscal shock absorption increases contact stress on articular cartilage.
4. Ligamentous Laxity: Chronic instability from unrepaired ligament injuries causes abnormal kinematics and cartilage wear.

"The Die is Cast at the Moment of Impact": The irreversible cartilage damage occurs at the time of injury. Perfect anatomical reduction minimizes but cannot eliminate the risk of post-traumatic arthritis.

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4. Clinical Presentation

Symptoms

• Acute Knee Pain: Immediate onset, severe, exacerbated by weight-bearing or movement.
• Inability to Bear Weight: Patients typically cannot walk after injury.
• Swelling: Rapid hemarthrosis develops within 1-2 hours of injury.
• Deformity: Visible varus or valgus angulation in displaced fractures.
• Mechanical Symptoms: Locking or catching if meniscal tear or loose bodies present.

Signs

Inspection:

• Deformity: Valgus angulation (lateral plateau), varus angulation (medial plateau), or knee hyperextension (bicondylar).
• Swelling: Tense effusion, loss of normal knee contours.
• Skin Integrity:
  • Open Fracture: Rare (\u003c5%), but requires emergent debridement.
  • Fracture Blisters: Appear 24-48 hours post-injury. Critical surgical timing consideration.
    • Serous (Clear Fluid): Epidermo-dermal separation. Relatively safe to incise near (but better to wait).
    • Hemorrhagic (Blood-Filled): Dermo-dermal separation. Absolutely do NOT incise through - extremely high infection risk. [9]
  • Skin Tension/Edema: Tense, shiny skin indicates severe soft tissue swelling. Do NOT operate until wrinkle sign appears.
• Ecchymosis: May extend down leg, not a contraindication to surgery if skin quality good.

Palpation:

• Bony Tenderness: Over fracture site (proximal tibia).
• Crepitus: With movement (indicates fracture).
• Effusion: Ballotable patella, bulge sign.
• Compartments: Palpate all four compartments of leg (anterior, lateral, superficial posterior, deep posterior). Tense, woody compartments suggest compartment syndrome.

Neurovascular Examination (MANDATORY):

Vascular:

• Pulses: Palpate dorsalis pedis and posterior tibial arteries bilaterally. Compare to contralateral limb.
• Ankle-Brachial Index (ABI): If pulses diminished or asymmetric, measure ABI. ABI \u003c0.9 mandates CT angiography.
• Capillary Refill: Should be \u003c2 seconds.
• Signs of Ischemia: Pallor, paraesthesias, pain, pulselessness, poikilothermia (5 P's).

Neurological:

• Common Peroneal Nerve (L4-S2):
  • Motor: Ankle dorsiflexion (tibialis anterior), toe extension (extensor hallucis longus, extensor digitorum longus).
  • Sensory: First dorsal web space.
  • Injury Pattern: Foot drop, high-steppage gait. Occurs in 2-10% of plateau fractures, especially Schatzker IV and posterolateral injuries. [13]
• Tibial Nerve (L4-S3):
  • Motor: Ankle plantarflexion, toe flexion.
  • Sensory: Sole of foot.
• Superficial Peroneal Nerve: Ankle eversion, lateral foot sensation.
• Deep Peroneal Nerve: Toe extension, first web space sensation.

Range of Motion:

• Avoid stressing acutely injured knee.
• Passive range of motion assessment under anesthesia during surgery to assess ligamentous stability.

Compartment Syndrome Assessment

Compartment syndrome occurs in 5-10% of high-energy tibial plateau fractures, particularly Schatzker VI. [16] It is a surgical emergency requiring immediate fasciotomy.

Clinical Signs (Early):

• Pain Out of Proportion: Severe pain despite adequate analgesia, including opioids.
• Pain on Passive Stretch: Passively dorsiflexing toes (stretching deep posterior compartment) causes severe pain. Most sensitive early sign.
• Tense Compartments: Firm, woody feel to calf compartments on palpation.
• Paraesthesias: Altered sensation in distribution of nerves traversing affected compartment.

Clinical Signs (Late - Tissue Damage Established):

• Pulselessness: Absent pulses (late sign, indicates irreversible damage).
• Pallor: Pale, cool extremity.
• Paralysis: Motor weakness or paralysis (late sign).

Clinical Pearl: Pain out of proportion and pain on passive stretch are the earliest and most reliable clinical signs. Do NOT wait for pulselessness or paralysis - irreversible damage has occurred by this stage.

Compartment Pressure Measurement:

• Indications: High clinical suspicion, obtunded/unreliable patient, unclear clinical picture.
• Technique: Stryker needle or arterial line transducer. Measure all four compartments (anterior, lateral, superficial posterior, deep posterior).
• Diagnostic Criteria:
  • Absolute Pressure \u003e30-40 mmHg: Compartment syndrome likely.
  • Delta Pressure (Diastolic BP - Compartment Pressure) \u003c30 mmHg: Diagnostic. Most reliable criterion. [17]

Management: Emergency four-compartment fasciotomy within 6 hours of onset to prevent irreversible muscle necrosis and Volkmann's contracture.

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5. Investigations

Initial Trauma Assessment

Standard ATLS protocol for polytrauma patients. Tibial plateau fractures often occur in high-energy mechanisms with multi-system injuries.

Imaging

Radiographs (Initial Assessment)

Standard Views:

• AP Knee: Assess for fracture pattern, articular step-off, condylar widening.
• Lateral Knee: Assess for posterior plateau fracture, posterior slope. Horizontal beam lateral (shoot-through) for lipohemarthrosis (fat-fluid level in suprapatellar pouch - pathognomonic for intra-articular fracture). [10]
• Oblique Views (Internal and External Rotation): Better visualize depression and plateau contour.

Full-Length Tibia/Fibula: Rule out concomitant tibial shaft fracture, fibular fracture.

Contralateral Knee: Compare plateau morphology, especially posterior slope.

Radiographic Measurements:

• Articular Depression: Depth in millimeters (normal plateau should be level).
• Articular Step-Off: Height difference between fracture fragments.
• Condylar Widening: Measured at level of tibial spines. \u003e5mm indicates significant ligamentous injury.
• Posterior Slope: Normally 7-10 degrees. Loss of slope indicates posterior plateau depression.

Lipohemarthrosis Sign:

• Horizontal beam lateral radiograph with knee slightly flexed.
• Fat-fluid level (marrow fat floating on blood) in suprapatellar pouch.
• Pathognomonic for intra-articular fracture, even if fracture line not visible on radiograph.

CT Scan (Gold Standard for Operative Planning)

Indications: All tibial plateau fractures considered for operative management. [4]

Protocol:

• Thin-slice (1-2mm) axial images.
• Coronal and sagittal reconstructions.
• 3D reconstructions (helpful for complex patterns but not essential).

Information Provided:

• Fracture Mapping: Identify all fracture lines, including posterior column (invisible on AP radiograph).
• Depression Quantification: Measure depth of articular depression in millimeters.
• Fragment Size: Assess size and displacement of individual fragments.
• Surgical Planning: Determine approaches required (anterolateral, posteromedial, posterolateral).
• Bone Quality: Assess for osteoporosis (may require locked plating or augmentation).

Timing: In high-energy fractures, obtain CT after application of spanning external fixator once swelling reduced (5-7 days). In low-energy stable fractures, obtain CT immediately if operative management considered.

MRI (Selective Use)

Indications:

• Assessment of ligamentous injuries (ACL, PCL, MCL, LCL, posterolateral corner) if clinical examination suggests instability.
• Evaluation of meniscal tears (though arthroscopy at time of ORIF is more definitive).
• Occult fractures (radiographs and CT negative but high clinical suspicion).
• Subacute presentation where bone edema pattern helpful.

Limitations:

• Limited availability in acute trauma setting.
• Degraded image quality if metal fixation already in place.
• Cannot replace CT for fracture mapping and operative planning.

Findings:

• Bone marrow edema patterns.
• Meniscal tears (47-91% of plateau fractures). [11]
• Ligament tears (ACL 15-20%, PCL 5%, collaterals 20-30%).
• Cartilage injury.

Vascular Studies

Indications:

• Asymmetric or absent pulses.
• ABI \u003c0.9.
• High-energy bicondylar fracture (Schatzker IV, V, VI).
• Knee dislocation (even if reduced).
• Expanding hematoma.

Ankle-Brachial Index (ABI):

• Blood pressure cuff on injured leg, measure systolic pressure at dorsalis pedis/posterior tibial.
• Divide by brachial systolic pressure.
• ABI \u003c0.9: Abnormal, requires further investigation with CT angiography.

CT Angiography:

• Non-invasive, rapid, excellent sensitivity and specificity for arterial injury.
• Can be performed simultaneously with fracture CT.
• Visualizes popliteal artery, trifurcation, distal vessels.

Findings:

• Arterial transection, occlusion, intimal injury, pseudoaneurysm.
• If arterial injury identified: Emergency vascular surgery consultation for repair or bypass.

Laboratory Studies

• Full Blood Count: Baseline hemoglobin (may need transfusion if significant blood loss).
• Coagulation Profile: If planning surgery or anticoagulated.
• Group and Save/Crossmatch: For potential surgical blood loss.
• Renal Function: If planning contrast studies (CT angiography).

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6. Management Algorithm

                  TIBIAL PLATEAU FRACTURE IDENTIFIED
                            ↓
                ┌───────────────────────────┐
                │  PRIMARY SURVEY (ATLS)    │
                │  - Assess ABC             │
                │  - Rule out polytrauma    │
                └───────────┬───────────────┘
                            ↓
                ┌───────────────────────────┐
                │  NEUROVASCULAR EXAM       │
                │  - Pulses (ABI if needed) │
                │  - Common peroneal nerve  │
                │  - Compartment assessment │
                └───────────┬───────────────┘
                            ↓
        ┌───────────────────┼───────────────────┐
        │                   │                   │
    VASCULAR           COMPARTMENT          STANDARD
     INJURY             SYNDROME            PATHWAY
        │                   │                   │
        ↓                   ↓                   ↓
  EMERGENCY            EMERGENCY         CLASSIFY FRACTURE
  VASCULAR            FASCIOTOMY         (Schatzker I-VI)
   SURGERY                                      ↓
                                    ┌───────────┴───────────┐
                                    │                       │
                              LOW ENERGY                HIGH ENERGY
                           (Schatzker I-III)         (Schatzker IV-VI)
                                    │                       │
                                    ↓                       ↓
                          ARTICULAR STEP > 3mm?      SPANNING EX-FIX
                          OR UNSTABLE > 10°?         (Damage Control)
                                    │                       │
                          ┌─────────┴─────────┐             ↓
                          │                   │        CT SCAN
                         NO                  YES       (Once swelling ↓)
                          │                   │             │
                          ↓                   ↓             ↓
                    CONSERVATIVE           ORIF      WAIT FOR WRINKLE
                    - Hinged brace      (Immediate)  SIGN (10-14 days)
                    - NWB 6-10 weeks   - Percutaneous │
                    - Serial X-rays     screws (Type I) ↓
                                       - ORIF + plate  DEFINITIVE ORIF
                                        (Type II-III)  - Dual plating
                                                      - Bone grafting
                                                      - Assess ligaments

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7. Management: Conservative (Non-Operative)

Indications

Conservative management is appropriate for selected low-energy fractures meeting ALL criteria:

• Minimal Articular Displacement: Step-off \u003c2-3mm. [7]
• Condylar Widening: \u003c5mm (indicates intact collateral ligaments).
• Stable Joint: Varus/valgus stress testing in extension shows \u003c10 degrees angulation (intact ligamentous structures).
• Acceptable Alignment: No significant coronal or sagittal plane deformity.
• Patient Factors: Non-ambulatory patient (severe dementia, bedbound from other conditions), medical comorbidities prohibiting surgery, patient preference after informed discussion.

Contraindications to Conservative Management

• Articular step-off ≥3 mm: Significantly increases post-traumatic arthritis risk. [7]
• Instability \u003e10 degrees: Indicates ligamentous disruption requiring surgical stabilization.
• Open fracture: Requires surgical debridement.
• Compartment syndrome: Surgical emergency.
• Vascular injury: Requires emergent intervention.

Conservative Management Protocol

Immobilization:

• Hinged Knee Brace: Locked in extension (0 degrees) or 0-30 degrees for first 2 weeks, then gradually increased to 0-90 degrees by 6 weeks. Prevents displacement while allowing early mobilization to reduce stiffness.
• Cylinder Cast: Alternative if brace not available, but prevents early motion and increases stiffness risk.

Weight-Bearing:

• Non-Weight-Bearing (NWB) or Touch-Weight-Bearing (10-15kg) for 6-10 weeks until radiographic healing evident.
• Gradual progression to partial weight-bearing, then full weight-bearing by 10-12 weeks.
• Articular cartilage heals poorly under shear stress; early weight-bearing risks fragment displacement and cartilage degeneration.

Physiotherapy:

• Early range of motion exercises (within brace restrictions) to prevent arthrofibrosis.
• Quadriceps strengthening (isometric exercises initially).
• Gait training with crutches/frame.

Follow-Up Protocol:

• Week 1-2: Clinical review, assess neurovascular status, ensure brace compliance.
• Week 2: Repeat radiographs (AP and lateral) to assess for displacement. If displacement occurs → reconsider surgical management.
• Week 6: Radiographs, assess healing. If callus forming and no displacement → increase weight-bearing.
• Week 10-12: Radiographs. If healed → progress to full weight-bearing.
• Month 6-12: Assess functional outcome, radiographic signs of post-traumatic arthritis.

Failure of Conservative Management:

• Loss of Reduction: Displacement \u003e3mm on follow-up radiographs → convert to surgical management.
• Persistent Instability: \u003e10 degrees varus/valgus laxity → consider delayed ligament reconstruction.
• Intractable Pain: May indicate occult displacement, meniscal tear, or cartilage injury → consider arthroscopy or delayed ORIF.

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8. Management: Surgical

Indications for Operative Management

Absolute Indications:

• Open Fracture: Requires urgent irrigation, debridement, and stabilization.
• Compartment Syndrome: Emergency fasciotomy + fracture stabilization.
• Vascular Injury: Requires arterial repair/bypass + fracture stabilization to protect vascular repair.

Relative Indications (Surgery Strongly Recommended):

• Articular Step-Off ≥3 mm: Strong predictor of post-traumatic arthritis. [7]
• Condylar Widening \u003e5 mm: Indicates ligamentous disruption and joint incongruity.
• Instability \u003e10 degrees on varus/valgus stress: Functional instability requires surgical stabilization.
• Posterior Plateau Fracture: Cannot be reduced conservatively; requires surgical elevation and fixation.
• Bicondylar Fractures (Schatzker V/VI): Inherently unstable.

Surgical Timing

Emergency Surgery (Within 6-8 Hours):

• Open fracture (Gustilo-Anderson grading → debridement).
• Compartment syndrome (fasciotomy).
• Irreducible knee dislocation with vascular compromise.

Urgent Surgery (Within 24-48 Hours):

• Low-energy fracture (Schatzker I-III) with good soft tissue envelope.
• Isolated split fracture amenable to percutaneous screw fixation.

Staged Surgery (Damage Control): [5,6]

• High-Energy Fractures (Schatzker IV-VI) with severe soft tissue injury.
• Tense Swelling: Fracture blisters, skin tenting, shiny edematous skin.

Damage Control Protocol:

1. Immediate Spanning External Fixation (within 24 hours):
   • Femoral pin (distal femur) and tibial pin (distal tibia/calcaneus).
   • Restores length and alignment via ligamentotaxis.
   • Allows soft tissue swelling to resolve.
   • Allows compartment monitoring.
2. CT Scan: Obtain once swelling reduced (5-7 days) for definitive surgical planning.
3. Wait for "Wrinkle Sign": Fine skin wrinkling indicating resolution of edema. Typically 10-14 days post-injury (range 7-21 days). [6]
4. Definitive ORIF: Remove external fixator, perform definitive internal fixation.

Evidence: Staged management of high-energy tibial plateau fractures reduces infection rates from 20-30% (immediate ORIF) to 5-8% (staged approach). [5,6]

Surgical Techniques

1. Percutaneous Screw Fixation

Indications:

• Schatzker Type I (pure lateral split, no depression).
• Minimal comminution, reducible fracture.
• Good bone quality.

Technique:

• Closed reduction under fluoroscopy.
• Percutaneous guidewire placement (typically 2-3 screws).
• Cannulated screw insertion (6.5mm or 7.3mm partially threaded screws).
• Configuration: Parallel or divergent to prevent rotational instability.

Advantages: Minimal soft tissue disruption, reduced infection risk, faster recovery.

Disadvantages: Limited to simple fracture patterns, risk of malreduction.

2. Open Reduction Internal Fixation (ORIF)

Indications:

• Schatzker Type II-III (split-depression, pure depression).
• Articular depression requiring elevation and grafting.
• Fractures not amenable to percutaneous techniques.

Approach - Anterolateral:

• Most common approach for lateral plateau fractures.
• Incision from Gerdy's tubercle extending proximally.
• Interval between iliotibial band and biceps femoris.
• Allows access to lateral plateau, elevation of depressed fragments, and plate application.

Technique:

1. Exposure: Elevate lateral meniscus if needed to visualize articular surface.
2. Articular Reduction:
   • Elevate depressed articular fragments using bone tamp or elevator through metaphyseal window.
   • Achieve anatomical articular reduction (step-off \u003c2mm goal).
   • Temporary K-wire fixation.
3. Subchondral Support ("Rafting Screws"):
   • Multiple screws placed horizontally immediately subchondral to articular surface.
   • Act as "raft" or "floor joists" to support reduced articular surface and prevent subsidence.
4. Metaphyseal Void Filling:
   • Elevating depressed fragments creates metaphyseal void.
   • Fill with bone graft (autograft from iliac crest/distal femur) or bone graft substitute (calcium phosphate, calcium sulfate).
   • Prevents collapse of elevated articular surface. [18]
5. Buttress Plating:
   • Lateral periarticular locking plate applied.
   • Proximal screws provide subchondral support, distal screws provide shaft fixation.
   • Plate acts as buttress to prevent lateral condyle sliding down slope.

Approach - Posteromedial:

• Indications: Schatzker Type IV (medial plateau), posteromedial column fractures.
• Patient positioned supine with sandbag under ipsilateral hip.
• Incision posterior to medial border of tibia.
• Interval between pes anserinus (anteriorly) and medial gastrocnemius (posteriorly).
• Allows direct visualization and fixation of posteromedial plateau.

Approach - Posterolateral:

• Indications: Posterolateral column fractures (common in Schatzker II).
• Patient positioned prone or lateral decubitus.
• Incision over fibular head.
• Protect common peroneal nerve (at risk).
• Allows direct access to posterolateral articular fragments invisible on AP radiograph. [14]

3. Dual Plating (Bicondylar Fractures)

Indications:

• Schatzker Type V (bicondylar, metaphyseal continuity).
• Schatzker Type VI (bicondylar with metaphyseal dissociation).

Technique:

• Two Separate Incisions: Anterolateral and posteromedial (or medial).
• Skin Bridge: Maintain \u003e7cm skin bridge between incisions to preserve blood supply and prevent skin necrosis.
• Sequence:
  1. Reduce and provisionally fix articular surface to itself (reassemble plateau).
  2. Reduce articular block to tibial shaft.
  3. Apply medial plate first (provides stability for lateral plating).
  4. Apply lateral plate second.
• Plate Orientation: Medial plate anteromedial or posteromedial, lateral plate anterolateral.

Critical Pearl: NEVER use a single midline longitudinal incision for bicondylar fractures. It raises massive anterior and posterior skin flaps, devascularizes the subcutaneous tissue, and leads to catastrophic wound necrosis and infection. [9]

4. Fine Wire Circular Fixation (Ilizarov/Taylor Spatial Frame)

Indications:

• Severe soft tissue injury precluding internal fixation.
• Infected nonunion after failed ORIF.
• Bone loss requiring gradual correction.
• Periarticular osteoporotic bone (screws will not hold).

Technique:

• Rings above and below fracture site.
• Tensioned fine wires (1.8mm) through bone.
• Gradual distraction, compression, or translation to achieve reduction.
• Allows early weight-bearing despite fracture.

Advantages: Minimally invasive, preserves soft tissue envelope, allows early mobilization and weight-bearing.

Disadvantages: Pin site care required, risk of pin site infection, patient discomfort, steep learning curve.

Intraoperative Considerations

Meniscal Tears:

• Inspect menisci during arthrotomy or arthroscopy.
• Repair if peripheral tear amenable to suture.
• Excise if degenerative, complex, or irreparable.
• Preserving meniscus improves long-term outcomes.

Ligamentous Injuries:

• Assess ligament stability under anesthesia (varus/valgus stress, Lachman, posterior drawer).
• Grade I-II sprains: Treat conservatively post-fixation.
• Grade III complete tears: Consider acute repair or reconstruction (ACL, PCL, posterolateral corner). Timing controversial - some advocate staged reconstruction after fracture healed.

Bone Grafting:

• Autograft (iliac crest, distal femur): Gold standard, osteogenic and osteoconductive.
• Allograft (cancellous chips): Osteoconductive, no donor site morbidity.
• Bone graft substitutes (calcium phosphate, calcium sulfate): Osteoconductive, resorb and remodel. Equivalent outcomes to autograft in many studies. [18]

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9. Post-Operative Management

Immediate Post-Operative Care

• Neurovascular Monitoring: Hourly observations for first 24 hours (compartment syndrome risk).
• Ice and Elevation: Reduce swelling.
• Analgesia: Multimodal analgesia (opioids, NSAIDs, paracetamol, local anesthetic infiltration).
• DVT Prophylaxis: Low molecular weight heparin or mechanical prophylaxis (contraindications to anticoagulation).
• Wound Care: Monitor for signs of infection, dehiscence.

Mobilization Protocol

Range of Motion:

• Immediate (Day 1-2): Begin passive and active-assisted range of motion to prevent arthrofibrosis.
• Goal: Achieve 0-90 degrees flexion by 6 weeks.
• Continuous Passive Motion (CPM): Controversial. Some studies show no benefit; others show reduced stiffness. Use based on surgeon preference and patient tolerance.

Weight-Bearing:

• Low-Energy Fractures (Schatzker I-III): Touch weight-bearing (10-15kg) for 6 weeks, then progressive weight-bearing. Full weight-bearing by 10-12 weeks.
• High-Energy Bicondylar Fractures (Schatzker V-VI): Non-weight-bearing for 10-12 weeks, then progressive weight-bearing based on radiographic healing.
• Locked Plating: Allows earlier weight-bearing in some cases due to angular stability.

Physiotherapy:

• Quadriceps strengthening (straight leg raises, isometric exercises).
• Hamstring and calf stretching.
• Proprioceptive training.
• Gait training with appropriate walking aids.

Follow-Up Schedule

• Week 2: Wound check, remove sutures/clips if healed. Radiographs to confirm maintained reduction.
• Week 6: Radiographs (AP and lateral). Assess healing, increase weight-bearing if callus forming.
• Week 12: Radiographs. Progress to full weight-bearing if healed.
• Month 6: Functional assessment, radiographs to assess for post-traumatic arthritis.
• Annual: Long-term surveillance for arthritis development.

Return to Activities

• Sedentary Work: 3-6 months post-operatively.
• Manual Labor: 6-12 months, dependent on healing and functional recovery.
• Impact Sports: 12-18 months, only if full range of motion, strength, and radiographic healing achieved.

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10. Complications

Early Complications (0-6 Weeks)

Compartment Syndrome: [16]

• Incidence: 5-10% in high-energy fractures (Schatzker VI highest risk).
• Pathophysiology: Increased intracompartmental pressure → ischemia → muscle necrosis.
• Prevention: Close monitoring, low threshold for fasciotomy.
• Treatment: Emergency four-compartment fasciotomy. Delayed fasciotomy (\u003e8 hours) leads to permanent muscle damage and Volkmann's contracture.

Wound Complications: [9]

• Wound Dehiscence: 5-15% in high-energy fractures operated too early.
• Skin Necrosis: Midline incisions, excessive soft tissue dissection, premature surgery through edematous skin.
• Prevention: Wait for wrinkle sign, use separate incisions for dual plating, minimize periosteal stripping.
• Treatment: Wound care, negative pressure wound therapy, possible flap coverage.

Deep Infection: [9]

• Incidence: 1-5% low-energy fractures, 5-15% high-energy fractures.
• Risk Factors: Open fracture, premature surgery, wound dehiscence, smoking, diabetes.
• Presentation: Wound drainage, erythema, systemic symptoms (fever, elevated inflammatory markers).
• Treatment: Surgical debridement, removal of hardware (if fracture healed), culture-directed IV antibiotics (6-12 weeks), possible antibiotic cement spacer, external fixation.

Venous Thromboembolism:

• DVT: Incidence 5-10% despite prophylaxis.
• Pulmonary Embolism: 1-2%, potentially fatal.
• Prevention: LMWH, early mobilization, compression stockings.
• Treatment: Therapeutic anticoagulation (balance against bleeding risk post-operatively).

Neurovascular Injury:

• Common Peroneal Nerve Palsy: 2-10%, higher in Schatzker IV and posterolateral injuries. [13]
• Recovery: 50-70% recover spontaneously over 6-12 months. Persistent foot drop may require tendon transfer or ankle-foot orthosis.
• Popliteal Artery Injury: Rare but catastrophic. Requires emergency vascular surgery.

Intermediate Complications (6 Weeks - 6 Months)

Loss of Reduction:

• Incidence: 5-15%, higher in osteoporotic bone and high-energy fractures.
• Causes: Inadequate fixation, bone graft resorption/collapse, early weight-bearing, non-compliance.
• Prevention: Adequate subchondral support (rafting screws), bone grafting of metaphyseal void, locked plating in osteoporotic bone.
• Treatment: If \u003c3mm subsidence and fracture healing → observe. If \u003e3mm and ongoing collapse → revision ORIF or conversion to arthroplasty if severe arthritis.

Stiffness (Arthrofibrosis):

• Incidence: 10-20%.
• Risk Factors: Prolonged immobilization, delayed mobilization, high-energy injury, infection.
• Prevention: Early range of motion exercises, aggressive physiotherapy.
• Treatment: Manipulation under anesthesia (MUA) if \u003c6 months post-injury and stiffness refractory to physiotherapy. Arthroscopic or open arthrolysis if MUA fails.

Malunion:

• Articular Malunion: Step-off \u003e3mm → post-traumatic arthritis.
• Extra-Articular Malunion: Varus/valgus malalignment, rotational deformity.
• Treatment: Corrective osteotomy if symptomatic and bone quality adequate. Arthroplasty if arthritic.

Late Complications (\u003e6 Months)

Post-Traumatic Osteoarthritis (PTOA): [7]

• Incidence: 20-60%, depending on fracture severity, quality of reduction, and associated injuries.
• Pathophysiology: Direct cartilage damage at injury + chronic incongruity + meniscal/ligamentous deficiency.
• Risk Factors:
  • Residual articular step-off \u003e3mm (strongest predictor). [7]
  • Meniscal excision (increases contact stress).
  • Ligamentous laxity (abnormal kinematics).
  • High-energy injury (greater cartilage damage).
  • Age \u003e50 (reduced cartilage healing capacity).
• Presentation: Gradual onset pain, stiffness, swelling, functional limitation. Radiographic joint space narrowing, osteophytes, subchondral sclerosis.
• Treatment:
  • Conservative: Weight loss, NSAIDs, physiotherapy, activity modification, intra-articular corticosteroid injections (temporary relief).
  • Surgical: High tibial osteotomy (if focal unicompartmental arthritis in young patient), total knee arthroplasty (if severe tricompartmental arthritis).

"The Die is Cast at the Moment of Impact": The irreversible articular cartilage injury occurs at the time of fracture. Perfect anatomical reduction minimizes but cannot eliminate PTOA risk. Patients must be counseled pre-operatively about long-term arthritis risk.

Nonunion:

• Incidence: Rare (\u003c5%) in metaphyseal bone with good blood supply.
• Risk Factors: Infection, inadequate fixation, bone loss, smoking, NSAIDs.
• Treatment: Revision ORIF with bone grafting, consider iliac crest autograft or bone morphogenetic protein (BMP).

Hardware Complications:

• Prominent Metalwork: Palpable subcutaneous plate, painful.
• Screw Penetration: Intra-articular screw perforation → cartilage damage.
• Hardware Failure: Plate/screw breakage in setting of nonunion or excessive loading.
• Treatment: Elective hardware removal once fracture healed (12-18 months post-operatively) if symptomatic.

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11. Outcomes and Prognosis

Functional Outcomes

Multiple studies report outcomes following tibial plateau fractures using validated scores (Knee Society Score, WOMAC, SF-36): [2,7]

• Good-Excellent Outcomes: 60-85% of patients achieve satisfactory functional outcome.
• Return to Pre-Injury Activity: 50-70% return to same level of activity.
• Factors Predicting Poor Outcome:
  • High-energy mechanism.
  • Schatzker IV-VI (bicondylar, medial plateau).
  • Residual articular incongruity \u003e2mm.
  • Meniscal excision.
  • Age \u003e50 years.
  • Associated ligamentous injuries.

Radiographic Outcomes

• Anatomical Reduction (step-off \u003c2mm): Achieved in 70-90% with ORIF.
• Post-Traumatic Arthritis: Develops in 20-60% by 5-10 years. [7]
• Conversion to Arthroplasty: 5-15% require total knee arthroplasty within 10 years of injury.

Prognostic Factors

Favorable:

• Young age (\u003c40 years).
• Low-energy mechanism.
• Schatzker I-III (lateral plateau, unicondylar).
• Anatomical reduction (\u003c2mm step-off).
• Meniscal preservation.
• Early mobilization.

Unfavorable:

• Age \u003e50 years.
• High-energy mechanism.
• Schatzker IV-VI (medial, bicondylar).
• Residual incongruity \u003e3mm.
• Meniscal excision.
• Ligamentous injury.
• Compartment syndrome.
• Infection.

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12. Evidence & Guidelines

Key Trials and Evidence

Canadian Orthopaedic Trauma Society (COTs) - Operative vs Non-Operative Management: [7]

• Randomized controlled trial comparing operative vs non-operative management of displaced tibial plateau fractures.
• Findings: Articular step-off \u003e3mm strongly associated with post-traumatic arthritis and poor functional outcomes. Operative management recommended for displaced intra-articular fractures.

Staged Management of High-Energy Fractures: [5,6]

• Multiple retrospective cohort studies demonstrate reduced infection rates with staged approach (spanning external fixation → delayed ORIF) compared to immediate ORIF through traumatized soft tissues.
• Infection rates: Immediate ORIF 20-30%, Staged approach 5-8%.
• Recommendation: Damage control orthopedics for high-energy fractures with significant soft tissue injury.

Bone Graft vs Bone Graft Substitute: [18]

• Systematic review and meta-analysis comparing autograft, allograft, and calcium-based substitutes for metaphyseal void filling.
• Findings: No significant difference in outcomes (loss of reduction, functional scores) between autograft and calcium phosphate/sulfate substitutes. Substitutes avoid donor site morbidity.
• Recommendation: Bone graft substitutes are acceptable alternative to autograft.

Posterolateral Fragment Fixation: [14]

• Observational studies show 30-40% of tibial plateau fractures involve posterolateral column, invisible on AP radiographs.
• Failure to fix posterior column leads to loss of reduction and varus collapse.
• Recommendation: CT scan mandatory for operative planning. Consider posterolateral approach for adequate fixation.

Guidelines

AO Foundation Principles:

• Anatomical reduction of articular surface (\u003c2mm step-off goal).
• Stable fixation to allow early mobilization.
• Preservation of soft tissue envelope and blood supply.
• Early range of motion to prevent stiffness.

British Orthopaedic Association Standards for Trauma (BOAST):

• High-energy tibial plateau fractures require senior surgeon involvement.
• CT scan mandatory for operative planning.
• Staged management recommended for compromised soft tissues.
• Multidisciplinary approach (orthopaedic surgeon, plastic surgeon if soft tissue reconstruction needed).

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13. Patient Explanation

What is a Tibial Plateau Fracture?

The tibial plateau is the flat top of your shin bone (tibia) that forms the lower part of your knee joint. It is like a table top that supports your thigh bone (femur). When it breaks, the smooth surface becomes uneven, like a cracked pavement. This can lead to problems with how your knee works and may cause arthritis over time.

How Did This Happen?

Your fracture occurred when a strong force was applied to your knee. This might have been:

• A fall from standing (if your bones are weaker due to osteoporosis).
• A car accident or fall from height (high-energy injury).
• Your knee being hit from the side (like being struck by a car bumper).

The fracture pattern depends on the direction and strength of the force.

Why Can't We Operate Immediately?

Your leg is very swollen right now. The skin over your shin bone is thin, and if we operate through swollen skin, there is a very high risk (10 times higher) that the wound will not heal properly. The wound could open up, and the metal plate could become infected. This would be a disaster requiring removal of the metalwork and multiple operations.

Instead, we will:

1. Put on a temporary frame (external fixator) on the outside of your leg to hold the bones in the right position.
2. Wait for the swelling to go down (usually 10-14 days). We look for fine wrinkles appearing in the skin - we call this the "Wrinkle Sign."
3. Perform the final operation with plates and screws once the skin is healthy. This gives you the best chance of the wound healing without problems.

What Does the Operation Involve?

We will make one or more cuts over your knee to access the broken bone. We will:

1. Lift up the depressed pieces of the joint surface to make it level again (like fixing a cracked pavement).
2. Fill the hole underneath with bone graft (either from your hip or an artificial bone substitute) to support the joint surface.
3. Put in screws just under the joint surface to hold the pieces in place (like floor joists holding up a floor).
4. Attach a metal plate on the side of the bone to hold everything together while it heals.

What Happens After Surgery?

• No Walking: You will not be able to put weight on your leg for 10-12 weeks (about 3 months). This is essential to allow the bone to heal properly. Walking too early can cause the bone to collapse again.
• Bending the Knee: We will start bending your knee within a few days of surgery to prevent it getting stiff. A physiotherapist will help you.
• Pain: You will have pain after surgery, but we will give you strong painkillers to manage this.
• Risk of Complications: There are risks including infection (5-10%), wound problems, blood clots, and stiffness. We take precautions to minimize these.

Long-Term Outlook

• Healing Time: The bone will take 3-6 months to heal fully.
• Return to Activities: You may return to light activities at 6 months, but full recovery takes 12-18 months.
• Arthritis Risk: Even with perfect surgery, there is a risk (20-60%) of developing arthritis in your knee over the next 5-10 years. This is because the cartilage was damaged at the moment of injury. We cannot reverse that damage, but we can minimize it by getting the joint surface as level as possible.
• Future Surgery: Some people (5-15%) need a knee replacement in the future if arthritis becomes severe.

What Should I Watch Out For?

Call us immediately or go to A&E if you develop:

• Severe pain that is not controlled by painkillers (could be compartment syndrome).
• Numbness or tingling in your foot.
• Inability to move your toes or ankle.
• Coldness or color change in your foot.
• Wound problems: Redness, swelling, discharge, wound opening.
• Chest pain or shortness of breath (could be blood clot in lung).

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14. References

1. Elsoe R, Larsen P, Nielsen NPH, et al. Population-based epidemiology of tibial plateau fractures. Orthopedics. 2015;38(9):e780-e786. doi:10.3928/01477447-20150902-55

2. Hoekstra H, Kempenaers K, Nijs S. A revised classification for fractures of the tibial plateau in the elderly: a multicentre study. Injury. 2018;49(11):2079-2084. doi:10.1016/j.injury.2018.09.022

3. Schatzker J, McBroom R, Bruce D. The tibial plateau fracture: the Toronto experience 1968-1975. Clin Orthop Relat Res. 1979;(138):94-104.

4. Luo CF, Sun H, Zhang B, Zeng BF. Three-column fixation for complex tibial plateau fractures. J Orthop Trauma. 2010;24(11):683-692. doi:10.1097/BOT.0b013e3181d436f3

5. Egol KA, Tejwani NC, Capla EL, et al. Staged management of high-energy proximal tibia fractures (OTA types 41): the results of a prospective, standardized protocol. J Orthop Trauma. 2005;19(7):448-455. doi:10.1097/01.bot.0000171881.11205.80

6. Sirkin M, Sanders R, DiPasquale T, Herscovici D Jr. A staged protocol for soft tissue management in the treatment of complex pilon fractures. J Orthop Trauma. 2004;18(8 Suppl):S32-S38. doi:10.1097/00005131-200409001-00005

7. Canadian Orthopaedic Trauma Society. Open reduction and internal fixation compared with circular fixator application for bicondylar tibial plateau fractures. J Bone Joint Surg Am. 2006;88(12):2613-2623. doi:10.2106/JBJS.E.01416

8. Moore TM, Patzakis MJ, Harvey JP. Tibial plateau fractures: definition, demographics, treatment rationale, and long-term results of closed traction management or operative reduction. J Orthop Trauma. 1987;1(2):97-119.

9. Kfuri M Jr, Fogagnolo F, Carneiro MB, Adamczyk B. Soft tissue management in tibial plateau fractures. J Knee Surg. 2013;26(3):169-176. doi:10.1055/s-0033-1343407

10. Gentili A, Miotto D, Moser RP Jr. Lipohemarthrosis of the knee: a systematic approach to diagnosis. Skeletal Radiol. 1996;25(5):453-459.

11. Bennett WF, Browner B. Tibial plateau fractures: a study of associated soft tissue injuries. J Orthop Trauma. 1994;8(3):183-188.

12. Gardner MJ, Yacoubian S, Geller D, et al. The incidence of soft tissue injury in operative tibial plateau fractures: a magnetic resonance imaging analysis of 103 patients. J Orthop Trauma. 2005;19(2):79-84. doi:10.1097/00005131-200502000-00002

13. Storgaard Lerche M, Raza H, Wilbek T, Møller-Madsen B. Prevalence and incidence of peroneal nerve lesions after fractures of the tibial plateau. Injury. 2019;50(1):256-259. doi:10.1016/j.injury.2018.11.024

14. Carlson DA. Posterior bicondylar tibial plateau fractures. J Orthop Trauma. 2005;19(2):73-78. doi:10.1097/00005131-200502000-00001

15. Kfuri M Jr, Schatzker J. Revisiting the Schatzker classification of tibial plateau fractures. Injury. 2018;49(12):2252-2263. doi:10.1016/j.injury.2018.11.010

16. Purnell GJ, Jonsson A, Smith B. Acute compartment syndrome following tibial plateau fracture. Injury. 2013;44(11):1644-1647. doi:10.1016/j.injury.2013.07.020

17. McQueen MM, Duckworth AD, Aitken SA, Court-Brown CM. The estimated sensitivity and specificity of compartment pressure monitoring for acute compartment syndrome. J Bone Joint Surg Am. 2013;95(8):673-677. doi:10.2106/JBJS.K.01731

18. Russell TA, Leighton RK; IOTA Investigators. Comparison of autogenous bone graft and endothermic calcium phosphate cement for defect augmentation in tibial plateau fractures: a multicenter, prospective, randomized study. J Bone Joint Surg Am. 2008;90(10):2057-2061. doi:10.2106/JBJS.G.01191

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15. Examination Focus (Viva Vault)

Q1: Classify tibial plateau fractures using the Schatzker system.

Answer:

• Type I: Lateral split (pure wedge). Young bone, vertical cleavage. Treatment: percutaneous screws.
• Type II: Lateral split-depression. Most common (55-70%). Middle-aged bone. Treatment: ORIF with elevation, grafting, buttress plate.
• Type III: Pure lateral depression. Osteoporotic bone. Lateral cortex intact. Treatment: percutaneous elevation + grafting or ORIF.
• Type IV: Medial plateau. High energy, varus force. "Fracture of dislocation." Highest neurovascular injury risk. Treatment: ORIF with medial buttress plate, assess posterolateral corner.
• Type V: Bicondylar. Both plateaus fractured, metaphysis intact. Inverted "Y" pattern. Treatment: dual plating.
• Type VI: Bicondylar with metaphyseal dissociation. Complete dissociation of articular surface from shaft. Severe soft tissue injury. Treatment: staged - spanning ex-fix → delayed dual plating.

Q2: What is the "Span, Scan, Plan" protocol and when is it used?

Answer: Used for high-energy tibial plateau fractures (Schatzker V/VI) with severe soft tissue injury.

• Span: Apply knee-spanning external fixator (femur to tibia/calcaneus) to restore length and alignment via ligamentotaxis.
• Scan: Obtain CT scan (once swelling reduced, typically 5-7 days) to map fracture pattern and plan definitive fixation.
• Plan: Wait for "Wrinkle Sign" (fine skin wrinkling indicating resolution of edema, typically 10-14 days) before performing definitive ORIF.

Rationale: Operating through edematous skin increases infection risk 10-fold. Staged management reduces infection rates from 20-30% to 5-8%.

Q3: What is lipohemarthrosis and what does it signify?

Answer: Lipohemarthrosis is a fat-fluid level seen on horizontal beam lateral radiograph of the knee (with patient supine or sitting). It appears as a radiolucent fat layer floating on top of blood (hemarthrosis) in the suprapatellar pouch.

Significance: Pathognomonic for intra-articular fracture. Marrow fat escapes from fractured cancellous bone into joint space and floats on blood due to lower density. Confirms intra-articular injury even if fracture line is radiographically occult.

Q4: Describe the "Rafting Screw" technique and its biomechanical rationale.

Answer: The rafting screw technique involves placing multiple screws horizontally in the subchondral bone (immediately below articular cartilage) to support elevated and reduced articular fragments.

Biomechanical Rationale:

• Screws act like "floor joists" or "rafters" supporting the articular surface.
• Prevent subsidence of elevated depressed fragments into metaphyseal void.
• Distribute axial loads across multiple points rather than single fixation point.
• Modern periarticular locking plates incorporate this design with rows of proximal screws in subchondral position.

Q5: Why should you avoid a single midline incision for bicondylar tibial plateau fractures?

Answer: A single midline longitudinal incision requires raising large anterior and posterior skin flaps to access both medial and lateral plateaus. This:

• Devascularizes subcutaneous tissue and periosteum over the proximal tibia.
• Leads to catastrophic wound necrosis and skin loss.
• Exposes metalwork, causing deep infection.

Correct Technique: Use two separate incisions (anterolateral and posteromedial/medial) with a skin bridge of \u003e7cm between them. This preserves the vascular supply via the intact skin bridge and minimizes wound complications.

Q6: What is the "Three-Column Concept" and why is it important?

Answer: The Three-Column Concept (Luo et al, 2010) is a CT-based classification dividing the tibial plateau into:

1. Lateral Column
2. Medial Column
3. Posterior Column (posterolateral and posteromedial)

Importance:

• Posterior column fractures are invisible on AP radiographs but occur in 30-40% of tibial plateau fractures.
• Failure to recognize and fix posterior column leads to loss of reduction, varus/valgus collapse, and poor outcomes.
• CT scan is mandatory for operative planning to identify posterior fragments.
• Posterior column fixation requires specific approaches (posterolateral or posteromedial) - cannot be adequately accessed or fixed through anterior approaches.

Q7: What are the indications for compartment syndrome fasciotomy in tibial plateau fractures?

Answer: Clinical Indications (HIGH index of suspicion):

• Pain out of proportion to injury (earliest sign).
• Pain on passive stretch of toes/foot (earliest reliable sign).
• Tense, woody compartments on palpation.
• Progressive paraesthesias.
• Weakness (late sign).

Compartment Pressure Criteria:

• Absolute pressure \u003e30-40 mmHg.
• Delta pressure (Diastolic BP - Compartment Pressure) \u003c30 mmHg (most reliable).

Action: Emergency four-compartment fasciotomy (anterior, lateral, superficial posterior, deep posterior) within 6 hours of diagnosis to prevent irreversible muscle necrosis and Volkmann's contracture.

Note: Do NOT wait for pulselessness or paralysis - irreversible damage has occurred by this stage.

Q8: What factors predict post-traumatic osteoarthritis after tibial plateau fracture?

Answer: Strongest Predictors:

• Residual articular step-off \u003e3mm: Strongest predictor. Creates focal stress concentration and accelerates cartilage degeneration.
• High-energy mechanism: Greater initial cartilage damage.
• Meniscal excision: Loss of shock absorption increases contact stress on articular cartilage.
• Ligamentous laxity: Abnormal kinematics and instability accelerate wear.

Other Risk Factors:

• Age \u003e50 years (reduced cartilage healing capacity).
• Schatzker IV-VI (more severe injury).
• Prolonged immobilization (cartilage nutrition impaired).
• Infection/complications.

Incidence: 20-60% develop radiographic arthritis by 5-10 years, depending on above factors.

Counseling: "The die is cast at the moment of impact"

• irreversible cartilage damage occurs at time of injury. Perfect reduction minimizes but cannot eliminate arthritis risk.