Fig. 1

Overview of the acquired aspects with their normal ultrasound image. a suprapatellar longitudinal axis (* suprapatellar recessus); b infrapatellar longitudinal axis(* proximal patellar tendon enthesis); c dorsal longitudinal axis of the talocrural joint (* joint margins of the upper talocrural joint); d longitudinal axis of the medial ankle tendons (* posterior tibial tendon); e longitudinal axis of the lateral ankle tendons (* long and short peroneal tendons)