Measurement and relationships of proprioceptive isokinetic repositioning, postural control, and a self-reported questionnaire in patients with chronic ankle instability

BACKGROUND: In subjects with chronic ankle instability (CAI), balance and functionality have been evaluated to determine the stability of the ankle, but there is limited evidence about relationships between these variables with active (AJR) and passive (PJR) isokinetic joint repositioning. OBJECTIVE: To determine the correlation between isokinetic joint repositioning, static balance, dynamic balance and a self-reported questionnaire in CAI participants. METHODS: Twenty subjects with unilateral CAI participated. AJR, PJR, average velocity (AV), average radius (AR), Modified Star Excursion Balance Test (SEBT) and Identification of Functional Ankle Instability were measured. RESULTS: The principal correlations were between the AJR of the affected ankle and the bilateral static balance [AV (r = -0.74, R 2 = 0.55, p = 0.005) and AR (r = -0.73, R 2 = 0.53, p = 0.006)]. A correlation between the PJR of the non-affected ankle with the SEBT of non-affected ankle in a posterolateral direction (r = -0.67, R 2 = 0.45, p = 0.017) was observed. CONCLUSIONS: Strong relationships were seen between the AJR of the affected ankle and the bilateral static balance. In standing position, the non-affected ankle could mask the altered proprioception and balance.