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A biomechanical evaluation of tibiofemoral rotation in anterior cruciate deficient knees during walking and running

Division of Sports Medicine and Department of Rehabilitation Medicine, University of Washington, Seattle, Washington

Frederick Lippert, MD

Department of Orthopaedics, University of Washington, Seattle, Washington

John E. Olerud, MD

Department of Dermatology, Sports Medicine and Orthopaedics, University of Washington, Seattle, Washington

ACL injury has been associated with increased insta bility of the knee in both in vitro and in vivo studies using passively applied forces. This study assessed tibiofemoral rotation after ACL injury during the func tional activity of treadmill ambulation using a triaxial electrogoniometer. Isometric and isokinetic peak torques of the quadriceps and hamstrings were ob tained using the Cybex II isokinetic dynamometer.

Significant increases in tibiofemoral rotation were noted with increased running speed in the injured and normal knees. The degree of rotation in the injured limb did not significantly exceed that of the normal limb. Isokinetic strength of the quadriceps and hamstrings correlates significantly with the observed extent of ro tation.

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