posterolateral corner injury of knee

Regarding posterolateral corner injuries of the knee,

1. Posterolateral corner injuries are more common than medial knee injuries
2. Arcuate fracture is a strong indicator of posterior cruciate ligament tear
3. Segond fracture is a strong indicator of posterior cruciate ligament tear
4. Popliteus myotendinous injury is usually associated with other posterolateral corner injuries
5. Lateral collateral ligament injury is a part of posterolateral corner injuries

Answers: F, T, F, T, T
Notes: Posterolateral corner injuries are less common than medial knee injuries, but more debilitating. The bone injuries include Segond fracture (indicator of ACL injury), Arcuate fracture (avulsion fracture of fibular head - indicator of PCL injury), anterior rim tibial plateau fracture (indicator of PCL injury) and Gerdy's tubercle avulsion fracture. Soft tissue injuries include lateral collateral ligament, biceps tendon, popliteus, lateral head of gastrocnemius, fabellofibular ligament, arcuate ligament and mid-third lateral capsular ligament.
Reference: Harish S et al. Imaging of the posterolateral corner of the knee. Clin Rad (2006) 61, 457-466