The fibular collateral ligament is a cord-like structure. It is attached superiorly to the lateral femoral epicondyle on the lateral surface of the lateral femoral condyle. Its inferior attachment is to the fibular head where it blends, in part, with the tendon of insertion of biceps femoris. Unlike the tibial (medial) collateral ligament which blends with the capsule of the knee joint and is partly attached to the medial edge of the medial meniscus, the fibular collateral ligament remains free both of the knee joint capsule and the lateral meniscus. The fibular collateral ligament arches over the tendon of popliteus and the lateral inferior genicular nerve and vessels.

Bursa between fibular collateral ligament and biceps femoris tendon

Occasionally a bursa may be found in relation to the fibular end of the biceps femoris tendon insertion. A bursa may, at times, be present at a higher level in the lateral part of the popliteal fossa. The bursa, which is often referred to as the biceps femoris bursa, may be confused with a ganglion arising from the superior tibiofibular joint.

Bursa between fibular collateral ligament and popliteus tendon

This may communicate with the joint cavity.