Objective To observe the clinical efficacy of electromagnetic extracorporeal shockwave lithotripsy(ESWL) in treatment of urethral calculi under B ultrasonic positioning. Methods The clinical data of 96 patients with urethral calculi who were treated with ESWL in our hospital were retrospectively analyzed. The patients' positions,B ultrasonic positioning methods and lithotripsy effect were observed and analyzed. Results When males took low head and high foot posture position,the success rate of removal of po...