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, 82 (10), 1441-5

Vastus Medialis Obliquus and Vastus Lateralis Activity in Open and Closed Kinetic Chain Exercises in Patients With Patellofemoral Pain Syndrome: An Electromyographic Study

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Vastus Medialis Obliquus and Vastus Lateralis Activity in Open and Closed Kinetic Chain Exercises in Patients With Patellofemoral Pain Syndrome: An Electromyographic Study

S F Tang et al. Arch Phys Med Rehabil.

Abstract

Objectives: To evaluate the electromyographic activities of vastus medialis obliquus (VMO) and vastus lateralis (VL) muscles in open and closed kinetic chain exercises in subjects with patellofemoral pain syndrome (PFPS).

Design: Case-controlled study.

Setting: Rehabilitation science center in a tertiary medical center.

Participants: Ten patients with bilateral knee pain diagnosed with PFPS and 10 healthy volunteers.

Interventions: Subjects performed open kinetic chain exercise on an isokinetic dynamometer and closed kinetic chain exercise by squat-to-stand and stand-to-squat tasks. Surface electromyography was done for the VMO and VL muscles.

Main outcome measures: VMO/VL ratios were calculated after normalization of muscle activities.

Results: The VMO/VL ratios of PFPS subjects were significantly lower than were those of unimpaired subjects during knee isokinetic closed kinetic chain exercises (p = .047). However, there was no statistical difference in VMO/VL ratio between subjects with and without PFPS during closed kinetic chain exercises (p = .623). Maximum VMO/VL ratio was obtained at 60 degrees knee flexion in closed kinetic chain exercise.

Conclusion: In closed kinetic chain exercises, more selective VMO activation can be obtained at 60 degrees knee flexion. Maximal VMO/VL ratio was observed at this knee flexion angle, and muscle contraction intensity was also greatest.

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