1. Tear of the popliteus tendon

A. Posterolateral (arcuate) complex

LCL

Popliteus tendon

Lateral head of gastrocnemius muscle

Arcuate ligament

Popliteofibular ligament

Fabellofibular ligament

Stoller's Orthopaedics and Sports Medicine: The Knee

B. Posterolateral corner (PLC) injury

Injury to a component of the lateral collateral ligament complex in association with a tear of the popliteus tendon, arcuate ligament, or popliteofibular ligament, and either the ACL or PCL is termed posterolateral corner injury. If not surgically corrected, such injury results in pain and instability with knee hyperextension.

Radiographics. 2014 Mar-Apr;34(2):496-513.

The incidence of PLC injury in the ACL-deficient knee has previously been under-reported. This series demonstrates that nearly 20% of patients with an ACL rupture have some injury to the PLC when evaluated by MRI

Skeletal Radiol. 2017 Aug;46(8):1063-1070.

Low-grade injuries of the PLC are often managed nonoperatively, whereas more significant PLC injuries, or those involving the biceps femoris, fibular collateral ligament, and/or popliteus, may require operative intervention.

Although infrequent, injuries to the PLC can lead to devastating consequences, including chronic knee instability, cartilage damage, and failed cruciate ligament reconstruction, if they are not detected.

C. Popliteus tear

With popliteus tears, it is important to note the site of the tear (intraarticular or extra-articular), the extent of the tear (partial or full-thickness), the presence of a bone fragment if there has been tendon avulsion, and degree of tendon retraction

The popliteus complex is a posterolateral rotary stabilizer of the knee.

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