What is the recommended treatment for a full‑thickness right anterior cruciate ligament (ACL) tear with impaction fractures of the lateral femoral condyle and posterolateral tibial plateau, bone contusion of the medial femoral condyle, posterior medial meniscocapsular injury, peripheral tear of the posterior horn of the lateral meniscus, and a small right knee joint effusion?

Treatment for Full-Thickness ACL Tear with Associated Injuries

This complex knee injury requires urgent surgical intervention within 3 months, combining ACL reconstruction with autograft, meniscal repair/preservation, and arthroscopic management of the impaction fractures and bone contusions. 1

Surgical Timing

Early ACL reconstruction is strongly recommended because the risk of additional cartilage and meniscal injury starts to increase within 3 months of injury. 1 Given the already present meniscal tears and impaction fractures, delaying surgery would further increase the risk of irreversible joint damage and progression to osteoarthritis.

ACL Reconstruction Approach

Graft Selection

• Use autograft over allograft to improve outcomes and decrease graft failure rates 1
• Choose between bone-patellar tendon-bone (BTB) or hamstring autograft based on specific considerations 1:
  • BTB reduces risk of graft failure and infection
  • Hamstring reduces risk of anterior knee pain and kneeling pain
  • Given the lateral femoral condyle impaction fracture, BTB may be advantageous as the tibial bone plug harvest site can provide autologous bone graft for the impaction fracture 2

Reconstruction Technique

• Single-bundle or double-bundle techniques have similar outcomes 1
• Consider anterolateral ligament (ALL) reconstruction or lateral extra-articular tenodesis (LET) if using hamstring autograft to reduce graft failure and improve short-term function 1

Management of Impaction Fractures

Lateral Femoral Condyle Impaction Fracture

The lateral femoral condyle impaction fracture requires specific attention as it significantly impacts knee stability and increases risk of ACL graft failure 2, 3:

• Arthroscopically assisted reduction and fixation is the preferred approach 4
• Bone grafting is essential to fill the subchondral defect 2, 3:
  • Use autologous bone from BTB tibial harvest site if available 2
  • Alternative: use tibial tunnel bone chips 2
  • For larger defects, consider osteochondral allograft transplantation 5
• Fixation options include:
  • Headless compression screws for fragments >2mm step-off 4, 6
  • Bone grafting alone may be sufficient for simple compression fractures 3

Posterolateral Tibial Plateau Impaction Fracture

This "apple bite" fracture pattern is commonly associated with ACL tears 4, 7:

• Arthroscopic-assisted reduction and fixation for articular step-off >2mm 4
• Fixation methods:
  • Cannulated screws (2.7mm crossed screws) 4
  • Bone grafting alone may provide adequate stability in simple compression patterns 3
• Studies show no significant difference in outcomes between screw fixation and bone grafting alone when properly compacted 3

Medial Femoral Condyle Bone Contusion

• Typically managed non-operatively with protected weight-bearing
• Monitor for progression during arthroscopy

Meniscal Management

Posterior Medial Meniscocapsular Injury

Meniscal preservation is critical, especially in the setting of ACL reconstruction 8:

• Repair the meniscocapsular junction to optimize joint health and function 8
• Use all-inside meniscal repair techniques 8
• Preserve as much functional meniscal tissue as possible to mitigate risk of osteoarthritis 8

Peripheral Tear of Posterior Horn of Lateral Meniscus

• Repair is strongly indicated given the peripheral location and vascularity 8
• Inside-out technique may reduce repair failure risk, though all-inside techniques reduce other complications 8
• Consider biological enhancement with platelet-rich plasma or bone marrow venting to improve repair outcomes 8

Critical point: The presence of posterolateral tibial plateau fractures is strongly associated with anterolateral complex injuries and meniscal pathology 7, making comprehensive arthroscopic evaluation essential.

Joint Effusion Management

• Aspirate the effusion if painful and tense prior to surgery 1
• This provides symptomatic relief and may improve preoperative range of motion

Surgical Sequence

Recommended arthroscopic approach:

1. Diagnostic arthroscopy to fully assess all injuries
2. Address impaction fractures first:
   • Elevate and reduce lateral femoral condyle fragment
   • Bone graft subchondral defect
   • Reduce and fix posterolateral tibial plateau if step-off >2mm
3. Meniscal repairs (both medial meniscocapsular and lateral meniscus)
4. ACL reconstruction with autograft
5. Verify stability and range of motion

Postoperative Considerations

• Protected weight-bearing for 6-12 weeks depending on fracture stability 4, 9
• Knee brace for 6 weeks 9
• Early range of motion at 3 weeks to prevent arthrofibrosis 9
• Functional bracing is NOT recommended for routine use after ACL reconstruction 1
• Functional evaluation (hop testing) should guide return to sport decisions 1

Critical Pitfalls to Avoid

• Do not delay surgery beyond 3 months - risk of irreversible meniscal and cartilage damage increases significantly 1
• Do not overlook the impaction fractures - they significantly increase risk of ACL graft failure and accelerate osteoarthritis 2, 3
• Do not perform meniscectomy instead of repair - meniscal preservation is essential for long-term joint health 8
• Do not use ACL repair instead of reconstruction - reconstruction has lower revision rates 1
• Be alert for anterolateral complex injuries - posterolateral tibial plateau fractures are strongly associated with these injuries 7

This injury pattern represents a severe constellation requiring comprehensive surgical management to optimize long-term knee function and minimize progression to post-traumatic osteoarthritis.