Investigating the Relation of Pelvic Tilt and Lumbar Lordosis with Strength of Lumbar-Pelvic Girdle Muscles in Subjects with Ankle Pronation Deformity

Foot alignment has an effect on movements of proximal joints and bones. According to the kinematic chain theory, weakness in function of one motor segment can have an effect on other motor segments. Therefore, the purpose of this study is investigate the relation of pelvic tilt and lumbar lordosis with strength of lumbar-pelvic girdle muscles in athletes with ankle pronation deformity in standing position. In this study, 53 male with ankle pronation deformity were recruited with age of 23.2±2.27 years, height of 169±6.76 and weight of 67.2±6.47. Isometric strength of muscles by handle dynamometer, pelvic tilt by pelvic inclinometer, lumbar lordosis by flexible ruler and foot pronation by navicular drop were investigated. Data were analyzed by statistical methods of correlation between variables. There were significant relations between isometric strength of femur flexor muscles and lumbar lordosis angle (p=0.003, r=0.59) and also between pelvic tilt and lumbar lordosis angle (p=0.012, r=0.46) in participants with ankle pronation deformity. No significant relation was found between other variables of the research (p≥0.05). The positive and significant relation of femur flexor muscles strength with lumbar lordosis and also pelvic tilt with lumbar lordosis may be due to the postural compensatory strategy in persons with ankle pronation deformity. To further explore the relation between these changes in posture alignment and injury more investigations are needed.