PURPOSE: The gluteus medius, a hip abductor, controls femoral movement and stabilizes the pelvis during lower extremity mobilization. SUBJECTS: This study enrolled 24 subjects into control and experimental groups. METHODS: This randomized controlled study included patients who underwent arthroscopy after meniscus injury and started a rehabilitative exercise program 8 weeks after surgery. Subjects were divided into the experimental gluteus medius resistance exercise group (n = 12) and the control group (n = 12). The study investigated muscle strength and balance of the flexors, extensors, and abductors of the knee for 8 weeks. RESULTS: Strengths of knee extensors in patients who underwent rehabilitative exercise for 8 weeks were measured. Strength of the knee extensors of the experimental and control groups increased by 40% and 31%, respectively; strength of the hip flexors of the experimental and control groups increased by 31% and 18%, respectively. Strength of the hip joint muscles showed a 40% increase in the experimental group and a 14% increase in the control group. However, there was a significant difference (18%) in muscle strength of the hip abductors between the groups. Measurements of trunk lateral flexion showed a difference within a group, but no intergroup difference was found. CONCLUSION: This study investigated the effect of hip abductor exercise on muscular strength and trunk stability in patients with a meniscus injury.

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