Abstract: ObjectiveTo observe the effect of low frequency current hydroelectric bath therapy modulated by medium frequency on sequela of sprain of ankle. Methods46 patients with sequela of sprain of ankle were treated with ZM C intellectual faculties intermediate frequency therapeutics instrument. Medium frequency was modulated with full square wave. The frequency of carrying wave was 4KHz. The frequency of modulated wave was 100Hz. The depth of modulation was 80%. The water temperature was 40℃.ResultsAfter treatment, all patients got satisfactory effect and shorter treating course without adverse reactions appearing. Conclusions The low frequency current hydroelectric bath therapy modulated by medium frequency is a simple, safe and better treating method for sequela of sprain of ankle.

Key words: modulated by medium frequency, low frequency current hydroelectric bath therapy, sequela of sprain of ankle