The role of the oblique popliteal ligament and other structures in preventing knee hyperextension

The American Journal of Sports Medicine
Patrick M MorganAaron Bianco

Abstract

Ligament restraints to terminal knee extension are poorly understood. (1) As with other motions of the knee, genu recurvatum is limited primarily by a named, identifiable structure. (2) As the largest static structure of the posterior knee, the oblique popliteal ligament is uniquely suited to act as a checkrein to knee hyperextension. Descriptive laboratory study. Twenty fresh-frozen human knees were divided into 3 groups for a ligament sectioning study. Extension moments of 14 and 27 N x m were applied before and after sectioning of each ligament, and motion changes were recorded. In group 1, the oblique popliteal ligament was sectioned first, followed by the fabellofibular ligament, ligament of Wrisberg, anterior cruciate ligament, posterolateral structures, and posterior cruciate ligament. In group 2, the order was altered to section the anterior cruciate ligament first; no other changes were made. Similarly, the cutting order for group 3 was altered to section the posterior cruciate ligament first. The sagittal tibial slope of each specimen was documented off a lateral radiograph. The greatest increase in knee hyperextension was observed after sectioning the oblique popliteal ligament. This was independent of cutting order,...Continue Reading

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