Impact of Iliopsoas Stretching on Posture and Mobility: A Case Study

Abstract

Background: The iliopsoas is a deep hip flexor complex formed mainly by the psoas major and iliacus muscles. Because it crosses the lumbar spine, pelvis, and hip joint, adaptive shortening of this muscle group may influence anterior pelvic tilt, lumbar lordosis, hip extension, stride length, standing posture, and transitional mobility. In many adults, prolonged sitting, reduced activity, repeated hip-flexed postures, and insufficient hip-extension movement can contribute to iliopsoas tightness. This tightness may not only produce anterior hip discomfort or low back strain but may also create altered movement strategies during walking, sit-to-stand, stair climbing, and upright standing. Stretching of the iliopsoas is therefore frequently used in physiotherapy practice to restore hip extension, improve lumbopelvic alignment, and support functional mobility.

Presentation of a Case: This case study presents a 36-year-old male office worker who reported gradual onset low back discomfort, anterior hip tightness, reduced walking comfort, poor standing posture, and difficulty maintaining an upright position after long sitting hours. The patient demonstrated excessive anterior pelvic tilt, increased lumbar lordosis, restricted hip extension, positive modified Thomas test findings, reduced gluteal activation, and a shortened stride pattern. Symptoms were aggravated by prolonged sitting, fast walking, climbing stairs, and standing after work. No red flag signs were present, and the main clinical impression was postural and functional mobility impairment associated with iliopsoas tightness and lumbopelvic muscle imbalance.

Intervention: A structured phase-wise physiotherapy program was implemented for 8 weeks. The program included pain education, postural awareness, diaphragmatic breathing, pelvic control training, modified Thomas-position iliopsoas stretching, half-kneeling hip flexor stretching with posterior pelvic tilt, active mobility drills, gluteus maximus and gluteus medius strengthening, abdominal stabilization, gait retraining, sit-to-stand training, stair practice, and home exercise reinforcement. Stretching was progressed from low-load sustained holds to controlled functional hip-extension positions while avoiding compensatory lumbar hyperextension.

Outcome Measure: Pain was assessed using the Numerical Pain Rating Scale, hip range of motion was measured by goniometry, iliopsoas length was assessed by the modified Thomas test, postural alignment was observed through anterior pelvic tilt and lumbar lordosis behavior, muscle strength was assessed using Manual Muscle Testing, and functional mobility was assessed through walking tolerance, sit-to-stand performance, stair negotiation, gait speed, step length, and the Timed Up and Go test.

Result: After 8 weeks of supervised and home-based physiotherapy, the patient demonstrated reduced pain, improved passive and active hip extension, reduced anterior pelvic tilt during relaxed standing, better pelvic control during walking, improved gluteal activation, increased walking tolerance, smoother sit-to-stand, and improved stair performance. Pain during prolonged sitting decreased from 7/10 to 2/10, pain during walking decreased from 6/10 to 1/10, hip extension improved from a restricted position to functional extension, and mobility became more efficient with less lumbar extension compensation.

Conclusion: This case study indicates that patient-specific iliopsoas stretching, when combined with postural retraining, gluteal strengthening, core stabilization, and functional mobility practice, may improve posture and mobility in an adult with hip flexor tightness and lumbopelvic movement dysfunction. The findings support the clinical importance of addressing iliopsoas flexibility as part of an integrated rehabilitation program rather than using stretching as an isolated technique.