What is the appropriate treatment for a proximal tibial fracture involving the posterior intercondylar eminence at the posterior cruciate ligament (PCL) attachment site and extending along the medial aspect of the lateral tibial plateau?

Treatment for Proximal Tibial Fracture Involving Posterior Intercondylar Eminence at PCL Attachment

This fracture requires open reduction and internal fixation (ORIF) using a direct posterior or posteromedial approach, with fixation achieved through cannulated screws with or without spiked washers for the bony fragment, combined with suture fixation if significant ligamentous avulsion is present.

Surgical Approach Selection

The direct posterior approach (Abbott-Carpenter technique) is safe and effective for this specific fracture pattern involving the posterior intercondylar eminence at the PCL attachment site extending along the medial aspect of the lateral tibial plateau 1, 2. This approach provides:

• Direct visualization of the posterior tibial structures
• Controlled identification and protection of neurovascular structures in the popliteal fossa
• Optimal access to the fracture site without compromising articular surface visualization

Alternative approach: The posteromedial approach (Burks-Schaffer interval between semimembranosus and medial gastrocnemius) can be used when the fracture extends more medially 3. Choose based on fracture location on preoperative CT imaging.

Patient Positioning and Surgical Technique

Position the patient prone with the knee flexed to 20-30 degrees to relax neurovascular structures and reduce tension on the posterior capsule 2.

Key Technical Steps:

1. Incision: Curvilinear L-shaped incision with longitudinal portion over medial gastrocnemius head, transverse portion distal to joint line extending laterally past midline 3

2. Dissection: Develop interval between semimembranosus and medial gastrocnemius muscles, retract gastrocnemius laterally to expose posterior capsule 3

3. Fracture preparation: Remove hematoma and debris from osseous bed, reduce fragment under direct visualization

4. Provisional fixation: Use K-wires for temporary stabilization, confirm reduction with fluoroscopy emphasizing sagittal plane alignment 3

5. Definitive fixation:

   • Cannulated cancellous screws (typically 4.0mm or 6.5mm) with or without spiked washers for enhanced stability of the bony fragment 1, 4
   • FiberWire sutures for any ligamentous avulsion component 1
   • Consider locking compression plate if significant comminution or extension into tibial plateau 4

Timing of Surgery

Perform surgery within 24 hours if the patient is hemodynamically stable without severe visceral injuries 5. This fracture pattern qualifies for early definitive osteosynthesis to reduce local and systemic complications.

Delay surgery if:

• Circulatory shock present
• Severe respiratory failure
• Multiple severe visceral injuries (brain, thorax, abdomen, pelvis, spinal cord)
• Coagulopathy

In delayed cases, temporary stabilization is not typically required for this fracture pattern, but optimize the patient medically before proceeding 5.

Critical Pitfalls to Avoid

Neurovascular complications: The most significant risk is tibial nerve injury, which occurred as transient neuropraxia in reported cases but resolved with conservative management 1, 2. Maintain meticulous dissection technique and gentle handling of neurovascular structures.

Delayed diagnosis: PCL avulsion fractures are frequently missed, especially when associated with other injuries 6, 7. Always obtain MRI preoperatively to assess:

• Degree of PCL injury (partial vs complete)
• Associated ligamentous injuries
• Exact fracture morphology and fragment size
• Posterior tibial translation severity

Inadequate fixation: Fractures extending along the medial aspect of the lateral tibial plateau require assessment for articular depression. If >2mm depression present, consider combined arthroscopic evaluation with open fixation 7.

Prone positioning concerns: While some surgeons avoid prone positioning due to anesthetic concerns, recent evidence demonstrates safety when proper precautions are taken including knee flexion maintenance and appropriate anesthetic optimization 2.

Concomitant Injuries

If ipsilateral lower limb fractures are present (tibial shaft, fibula), stage the procedures 4:

1. First stage: ORIF of tibial shaft fracture with locking compression plate
2. Second stage (same anesthesia or delayed): PCL avulsion fixation

Early-stage surgery produces superior outcomes compared to delayed treatment when concomitant fractures are present, though functional scores are inferior to isolated PCL avulsion injuries 6.

Postoperative Management

• Immobilization: Knee brace in extension for 2-4 weeks
• Weight-bearing: Non-weight-bearing for 6 weeks, then progressive weight-bearing
• Range of motion: Begin passive flexion at 2 weeks, limit to 90 degrees for first 6 weeks to protect fixation
• Strengthening: Quadriceps strengthening emphasized (avoid hamstring exercises initially as they increase posterior tibial translation)

Expected Outcomes

With appropriate surgical technique, expect 2:

• Mean Lysholm score: 85-91 at final follow-up
• Range of motion: 0-110 degrees or better
• Low complication rate (approximately 10% minor complications)
• Return to preoperative activity levels in majority of patients

The direct posterior approach demonstrates a 9.5% complication rate with no permanent neurological deficits, vascular injuries, or deep infections when performed with meticulous technique 2.