Effect of External Oblique Muscle Strengthening on Trunk Stability in Post-Stroke Hemiplagia: A Randomized Comparative Study

Background: Trunk instability is a common and disabling consequence of stroke - induced hemiplegia. Conventional physiotherapy often lacks segmental focus, potentially limiting recovery. Strengthening the external oblique muscles may enhance trunk control and postural alignment in such patients. Methods: A randomized controlled trial was conducted involving 60 first - time stroke patients aged 20?70 years with hemiparesis. Participants were allocated to two groups: Group A received conventional physiotherapy, while Group B received conventional therapy plus external oblique muscle strengthening exercises. The intervention lasted 12 weeks with five sessions per week. Outcome measures included the Postural Assessment Scale for Stroke (PASS) and the Trunk Impairment Scale (TIS). Results: Both groups showed significant improvements in PASS and TIS scores; however, Group B demonstrated greater gains. The mean improvement in PASS scores was 8.1 in Group B vs.4.2 in Group A (p = 0.001). Similarly, TIS scores improved by 7.1 in Group B compared to 3.5 in Group A (p = 0.001), indicating enhanced dynamic balance and trunk coordination in the intervention group. Conclusion: Incorporating external oblique muscle strengthening into standard physiotherapy significantly improves trunk stability and postural control in hemiparetic stroke patients. This approach offers a low - cost, scalable strategy suitable for both clinical and community - based rehabilitation settings