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Biomechanical considerations in

patellofemoral joint rehabilitationLISA A. STEINKAMP,* MS, PT, MICHAEL F. DILLINGHAM, MD,

MARK D. MARKEL, DVM, PhD, JENNIFER A. HILL,∥ANDKENTON R. KAUFMAN,a PhD

From *Functional Rehabilitation and Sports Therapy, PaloAlto, California, Sports, Orthopedic

and Rehabilitation MedicineAssociates, Portola Valley, California, the ComparativeOrthopaedic Research Laboratory, Department of Surgical Sciences, School of VeterinaryMedicine, University of Wisconsin-Madison, Madison, Wisconsin, the ∥ VeteransAdministration

Medical Center, PaloAlto, California, and the

a

Childrens Hospital and Health Center, SanDiego, California

ABSTRACT

Patellofemoral joint biomechanics during leg press and

leg extension exercises were compared in 20 normalsubjects (10 men, 10 women) aged 18 to 45 years.Knee moment, patellofemoral joint reaction force, and

patellofemoral jointstress were

calculatedfor each

subject at four knee flexion angles (0, 30, 60, and90) during leg press and leg extension exercises.All three parameters (knee moment, patellofemoral

joint reaction force, and patellofemoral joint stress)were significantly greater in leg extension exercise thanleg press exercise at 0 and 30 of knee flexion (P