PURPOSE: To determine the therapeutic effects of core stabilization exercise in the treatment of patients with clinical lumbar instability. METHODS: Twenty subjects with clinical lumbar instability were randomly assigned to a treatment or control group. The treatment group received 10 weeks of core stabilization exercise (CSE), while the control group (CG) received 10 weeks of hydrocollator therapy and trunk stretching exercises. Pain intensity of the instability catch sign (ICS), functional disability, and trunk muscle activation patterns were measured before and at one day after 10 weeks of intervention. RESULTS: Both groups showed a significant reduction in pain intensity of ICS and reduced functional disability after 10 weeks of intervention; however, a significant improvement in the ratio activation of the transversus abdominis and internal oblique muscle relative to the rectus abdominis was only seen in CSE. In the comparison between groups, CSE showed significantly greater improvement in reduction of pain intensity during the ICS, significantly reduced functional disability, and significantly increased deep abdominal muscle activation after 10 weeks of intervention compared to CG. CONCLUSION: The 10 weeks of CSE provided better therapeutic effects for pain intensity of ICS, reduced functional disability, and facilitated deep abdominal muscle activation of patients with clinical lumbar instability.

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