Oblique Popliteal Ligament

ligamentum popliteum obliquum

The oblique popliteal ligament is an expansion of the semimembranosus tendon that fans across the posterior knee capsule from the medial tibia to the lateral femoral condyle, reinforcing the posterior capsule against hyperextension. It is part of the posteromedial corner anatomy and contributes to the resistance against posterior tibial translation in conjunction with the PCL. Its disruption in knee hyperextension injuries contributes to posteromedial instability.

Region: Knee

Anatomical Data

Origin, Insertion & Supply

Origin	Expansion of the semimembranosus tendon from the posteromedial tibia
Insertion	Lateral femoral condyle and posterior knee capsule

Biomechanics

Function & Actions

Actions	Reinforces the posterior knee capsule against hyperextension; resists external tibial rotation in extension

Clinical Relevance

Clinical Notes

The oblique popliteal ligament is relevant in total knee arthroplasty where the posterior capsular release must carefully balance flexion and extension gaps. It is also recognised as a source of posterior knee pain from semimembranosus-oblique popliteal complex injuries in football players following direct posterior capsular trauma.

Pathology

Common Injuries & Conditions

Posterior Capsular Injury

Oblique popliteal ligament and posterior capsule disruption from hyperextension producing posterior knee pain and instability that contributes to PCL injury patterns.