The arcuate ligament of the knee is a Y-shaped fibrous reinforcement of the posterolateral capsule arising from the fibular head and fanning across the posterior knee over the popliteus muscle. Together with the popliteofibular and lateral collateral ligaments it forms the posterolateral corner complex. The Arcuate sign (fibular head avulsion fracture) on plain radiograph indicates PLC injury.
| Origin | Posterior lateral fibular head area |
|---|---|
| Insertion | Posterior knee capsule, posterolateral tibia |
| Actions | Part of the arcuate-popliteal ligament complex reinforcing the posterolateral capsule |
|---|
The arcuate ligament is reconstructed as part of the Laprade PLC reconstruction when the posterolateral corner is disrupted. The three primary structures reconstructed are the LCL, popliteus tendon, and popliteofibular ligament — the arcuate is reinforced indirectly by the popliteofibular reconstruction.
Posterolateral capsular disruption from high-energy knee trauma producing PLC instability managed with anatomical reconstruction of the LCL, popliteus, and popliteofibular ligament.
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