Effects of Pes Planus on Gait at Different Inclines

This study will evaluate the effects of pes planus deformity on gait spatiotemporal parameters and pelvic kinematics during walking on flat and inclined surfaces. Flexible pes planus will be confirmed with Jack's toe-raise test, and severity will be assessed using the navicular drop test. Healthy adults aged 18-35 years with bilateral flexible pes planus and normal BMI will be included. Exclusion criteria are lower extremity injury or surgery in the last 6 months, chronic ankle instability, other musculoskeletal disorders, or orthotic use. Gait will be assessed with the BTS-G wireless sensor system, recording speed, cadence, stride length, stance and swing phase percentages, gait cycle duration, pelvic tilt, obliquity, and rotation symmetry. Participants will walk in standard sports shoes on level and inclined treadmill conditions. Data will be analyzed to determine biomechanical differences across surfaces. The findings may provide insights into how pes planus influences gait and contributes to rehabilitation and footwear strategies.