Ankle sprain is one of the most common musculoskeletal injuries, with a high incidence among physically active individuals. acute ankle sprains associated with the development of chronic ankle instability (CAI) which has been found to affect the whole lower quarter kinetic chain. This chronicity decrease the physical activity level and quality of life, All these consequences cost the patients physically, emotionally, socially and financially. Purpose: To investigate the effect of corrected pelvic torsion using rigid taping on gait parameters and balance in patients with unilateral CAI associated with pelvic torsion.

Background: Ankle sprain is one of the most common musculoskeletal injuries, with a high incidence among physically active individuals. acute ankle sprains associated with the development of chronic ankle instability (CAI) which has been found to affect the whole lower quarter kinetic chain. This chronicity decrease the physical activity level and quality of life, All these consequences cost the patients physically, emotionally, socially and financially. Purpose: To investigate the effect of corrected pelvic torsion using rigid taping on gait parameters and balance in patients with unilateral CAI associated with pelvic torsion. Materials and Methods: 22 subjects from both genders were assessed for the presence of unilateral CAI associated with pelvic torsion , gait and balance were assessed using teckscan walkway assessment system and biodex balance system then rigid tape applied to the anteriorly tilted innominate then gait and balance reassessed again immediately after taping ,after one week and after two weeks.

Inculsion criteria :

1. history of at least one significant ankle sprain (the initial sprain must have occurred at least 12 months prior to study enrollment and the most recent injury must have occurred more than 3 months prior to study enrollment.
2. Participants should report at least 2 episodes of giving way in the last 6 month.
3. Self-reported ankle instability using CAIT should be >24 .
4. the presence of pelvic torsion must be present and confirmed using the PALM-Meter .

Exclusion criteria:

1. Individuals with bilateral lateral anklesprain.
2. Those with low back pain that required medical or surgical intervention.
3. Those with a history of spine, pelvis, and lower extremity injury, fracture, or surgery.
4. patients with trunk asymmetry angle of more than 7º and leg length discrepancy of more than 0.5 cm(19), those with skin diseases or sensitivity to rigid