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Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, Minnesota
Presented at the 24th annual meeting of the AOSSM, Vancouver, British Columbia, Canada, June 1998.
Address correspondence and reprint requests to Robert F. LaPrade, MD, Department of Orthopaedic Surgery, University of Minnesota, Box 492 Mayo Building, 420 Delaware Street SE, Minneapolis, MN 55455
To determine if untreated grade III injuries of the posterolateral structures contribute to increased force on an anterior cruciate ligament graft, we measured the force in the graft in cadaveric knees during joint loading after reconstruction with otherwise intact structures and in the same reconstructed knees after selected cutting of specific posterolateral knee structures. Tests were first performed on the knee with the posterolateral structures intact and then after sequential sectioning of the fibular collateral ligament, popliteofibular ligament, and popliteus tendon. The graft force was significantly higher after fibular collateral ligament transection during varus loading at both 0° and 30° of knee flexion than it was for the same loading of the joint with intact posterolateral structures. In addition, coupled loading of varus and internal rotation moments at 0° and 30° of flexion further increased graft force beyond that with varus force alone. The increase in graft force remained significant with additional sequential cutting of the popliteofibular ligament and popliteus tendon. We believe this study supports the clinical observation that untreated grade III posterolateral structure injuries contribute to anterior cruciate ligament graft failure by allowing higher forces to stress the graft.
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