Copers adopt an altered dynamic postural control compared to individuals with chronic ankle instability and controls in unanticipated single-leg landing

•Chronic ankle instability (CAI) contributes dynamic postural stability deficits.•Coper and control groups show similar ML sway during unanticipated tasks.•Copers demonstrate a significantly longer TTS AP and COP AP compared to the controls.•Increased time in AP sway in copers may be a protection technique.