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John H. Hollman, Jeffrey M. Hohl, Jordan L. Kraft, Jeffrey D. Strauss, and Katie J. Traver

Context:

Abnormal lower extremity kinematics during dynamic activities may be influenced by impaired gluteus maximus function.

Objective:

To examine whether hip-extensor strength and gluteus maximus recruitment are associated with dynamic frontal-plane knee motion during a jump-landing task.

Design:

Exploratory study.

Setting:

Biomechanics laboratory.

Participants:

40 healthy female volunteers.

Main Outcome Measures:

Isometric hip-extension strength was measured bilaterally with a handheld dynamometer. Three-dimensional hip and knee kinematics and gluteus maximus electromyography data were collected bilaterally during a jumplanding test. Data were analyzed with hierarchical linear regression and partial correlation coefficients (α = .05).

Results:

Hip motion in the transverse plane was highly correlated with knee motion in the frontal plane (partial r = .724). After controlling for hip motion, reduced magnitudes of isometric hip-extensor strength (partial r = .470) and peak gluteus maximus recruitment (partial r = .277) were correlated with increased magnitudes of knee valgus during the jump-landing task.

Conclusion:

Hip-extensor strength and gluteus maximus recruitment, which represents a measure of the muscle’s neuromuscular control, are both associated with frontal-plane knee motions during a dynamic weight-bearing task.