popliteofibular

The popliteofibular ligament is a short ligament of the knee that forms part of the posterolateral corner (PLC). It typically extends from the popliteus tendon to the fibular head, and its exact appearance can vary, sometimes presenting as a distinct band or as a thickening of the popliteus tendon.

Anatomy and relationships: The ligament lies in the posterolateral aspect of the knee, posterior to the LCL, and contributes to the stability of the PLC. It commonly arises near the popliteus tendon’s insertion on the femur and courses laterally and inferiorly to attach to the fibular head or fibular styloid. The popliteofibular ligament may be closely associated with other PLC structures, such as the fabellofibular ligament and the arcuate complex.

Function: The popliteofibular ligament helps stabilize the posterolateral corner of the knee. It resists external rotation of the tibia relative to the femur and contributes to varus and rotational stability, particularly when the knee is extended and under load. It works in concert with other PLC components to maintain joint stability in external rotational stresses.

Clinical significance: Injuries to the popliteofibular ligament are encountered in posterolateral corner injuries, often resulting from high-energy trauma that causes external tibial rotation or hyperextension. Diagnosis is typically aided by magnetic resonance imaging (MRI). Treatment depends on injury severity and may involve repair or reconstruction of PLC structures to restore stability.

See also: posterolateral corner, popliteus tendon, fibular head, arcuate ligament.