The arcuate ligament of the knee is an inverted Y-shaped capsular thickening in the posterolateral corner, with its stem arising from the fibular head and splitting to attach to the posterior capsule on each side of the popliteus tendon.
Provides posterolateral capsular reinforcement, contributes to the arcuate complex (arcuate ligament + popliteofibular ligament + lateral capsule) that provides posterolateral corner stability, and protects the popliteus tendon.
The arcuate fracture (fibular head avulsion of the arcuate ligament complex) is the radiographic hallmark of posterolateral corner injury — present in 75% of PLC injuries on plain radiograph. The arcuate complex is reconstructed as part of PLC surgery in Grade III injuries.
Fibular head avulsion fracture of the arcuate complex on plain radiograph indicating posterolateral corner disruption, associated with ACL or PCL tears in high-energy knee injuries.
Repair or reconstruction of the arcuate ligament as part of comprehensive posterolateral corner reconstruction using anatomic grafts targeting the FCL, popliteofibular ligament, and arcuate complex.
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