Arcuate Ligament



- Discussion:
    - it is not a separate ligament but is condensation of fibers of origin of popliteus and helps form the arcuate complex:
    - arcuate ligament is a Y shaped condensation of fibers that courses from the fibular head, over the popliteus, to 
          insert on the posterior capsule;
    - spans junction between popliteus & its tendon from fibula to femur in the postero-lateral aspect of knee;
          - lies just behind LCL;
          - it lies between 2 laminae of capsule, which are always separated by the inferior geniculate vessels;
          - medial limb of the arcuate ligament joins fibers of oblique ligament;
          - it is firmly adherent to the underlying musculotendinous junction of popliteus;
    - both arcuate and fabellogibular ligaments insert on apex of fibular styloid;
          - both ligaments ascend vertically to attach to lateral head of gastrocnemius,
                 - they are joined by posterior termination of oblique popliteal ligament;
   - absence of arcuate ligament:
          - ligament thickness is greatest in knees lacking a well-defined fabellofibular ligament;
          - when fabella is large, there is no arcuate ligament & fabellofibular ligament is robust;
          - when cartilagenous fabella is present both fabellofibular ligament & arcuate ligament will be present but smaller than normal;
                 - both ligaments are present in 2/3 of patients



Chronic posterolateral rotatory instability of the knee.

The role of the posterolateral and cruciate ligaments in the stability of the human knee. A biomechanical study.

Limits of movement in the human knee. Effect of sectioning the posterior cruciate ligament and posterolateral structures.



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Tuesday, May 1, 2012 4:06 pm