<![CDATA[Background: Spondylolisthesis is a spinal condition in which one vertebra slips forward or backwards with the next vertebra. Disturbances caused by this condition include the lumbar region, muscle spasm, decreased muscle strength, limitation of motion, and radiating pain in the legs. Most people refrain from back pain treatment and prefer a more traditional approach. Although many studies have proven that wearing brace for LBP were successful, lack of study mentioned about negative effects on short-term wearing. Therefore, this study aimed to determine the effect of using semirigid Lumbo Sacral Orthosis on the strength of the Trunk muscles in the case of Low Back Pain (LBP) e.c Spondylolisthesis. Aims: to determine the effect of using semirigid Lumbo Sacral Orthosis on the strength of the Trunk muscles in the case of Low Back Pain (LBP) e.c Spondylolisthesis. Methods: This research was quasi-experimental research using a pretest and posttest design approach. It was conducted at the Yogyakarta General Hospital, UGM Academic Hospital, Dr. Soeradji Tirtonegoro Klaten hospital and Tugurejo Semarang Hospital. The number of participants was 35 patients with purposive sampling. Results: There was an effect of using LSO Type Semirigid on trunk flexion muscles before and after treatments (Z = -5.099 with p value = 0.000), trunk rotational muscle strength before and after treatment (Z = -4.600 with p value = 0.000), trunk extension strength before and after treatment (Z = -4.472 with p value = 0.000). Conclusion: There was an effect of semirigid Lumbo Sacral Orthosis on the strength of the trunk muscles in the case of Low Back Pain (LBP), e.c Spondylolisthesis. As a result, the most significant effect that experienced a decrease in trunk muscle strength after the patient used semirigid LSO was in the flexion muscle group (0.75), then extension muscle (0.58) and rotation muscle (0.65).]]>
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