Isometric and isokinetic hip strength in males with chronic ankle instability and its relationship with dynamic balance and self-reported instability.

To investigate isometric and isokinetic hip strength as well as dynamic balance in males with chronic ankle instability (CAI) and explore potential associations between hip strength, dynamic balance, and self-reported instability. Cross-sectional study. University laboratory. Fifty male participants (25 with CAI and 25 healthy controls). Hip isometric and isokinetic torque normalized to body weight, Lower Quarter Y-balance Test (YBT-LQ), the Polish version of The Cumberland Ankle Instability Tool (CAIT-PL). Significant differences were observed only in the hip isometric abductors/adductors strength ratio (p = 0.034, ES = 0.65), which was lower in the CAI group. CAI participants showed reduced dynamic balance in posterolateral reach (p = 0.006, ES = 0.92) and composite score of YBT-LQ (p = 0.012, ES = 0.91). There was a moderate positive correlation between dynamic balance and hip abductors strength during posteromedial (r = 0.40, p = 0.049) and posterolateral (r = 0.40, p = 0.048) YBT-LQ reaches, and isometric hip abductors strength moderately positively correlated with self-reported instability (r = 0.46, p = 0.021) in the CAI group. Males with CAI exhibit deficits in frontal plane hip isometric strength, specifically in the hip abductor/adductor ratio, while no deficits were observed in isokinetic strength. The relationships between hip abductors strength, dynamic balance, and self-reported ankle instability may suggest the importance of hip abductors isometric strength for functional outcomes in CAI-patients. • Lower abductor/adductor hip isometric strength ratio was found in the CAI group. • CAI-individuals may exhibit isometric, but not isokinetic hip strength deficits. • Hip abductor strength remains to be associated with functional outcomes of CAI. • Hip strength exercises may be considered in management of CAI symptoms. • Further studies need to confirm effects of hip strengthening in CAI rehabilitation. [ABSTRACT FROM AUTHOR]