Posterolateral corner injury of the knee can occur in isolation or with other internal derangements of the knee, particularly cruciate ligament injuries. The importance of injuries to the posterolateral ligamentous complex lies in the possible long term joint instability and cruciate graft failure if these are not identified and treated.
These are thought to account for approximately 2% of acute ligamentous injuries of the knee 4. It is often seen in sports related injuries.
Trauma to the anteromedial tibia while in extension is a frequent cause of this type of injury by producing varus stress. Patients often present with symptoms due to associated cruciate ligament injury or peroneal nerve damage.
There is no consensus between authors and textbooks in what constitutes the posterolateral ligamentous complex. The four main structures are:
- lateral (fibular) collateral ligament
- popliteus muscle
- popliteofibular ligament
- biceps femoris tendon
Components of the posterolateral corner that with some variability can be identified on MRI are:
- 1. Vinson EN, Major NM, Helms CA. The posterolateral corner of the knee. AJR Am J Roentgenol. 2008;190 (2): 449-58. doi:10.2214/AJR.07.2051 - Pubmed citation
- 2. Vinson EN, Major NM, Helms CA. The posterolateral corner of the knee. AJR Am J Roentgenol. 2008;190 (2): 449-58. doi:10.2214/AJR.07.2051 - Pubmed citation
- 3. Jadhav SP, More SR, Riascos RF et-al. Comprehensive review of the anatomy, function, and imaging of the popliteus and associated pathologic conditions. Radiographics. 2014;34 (2): 496-513. doi:10.1148/rg.342125082 - Pubmed citation
- 4. Larsen MW1, Toth A. Examination of posterolateral corner injuries. J Knee Surg. 2005 ;18(2):146-50. doi:10.1148/rg.342125082 - Pubmed citation