The invention relates to an ankle brace for a prosthetic device (2) comprising a prosthetic foot (3) and a lower leg piece (4), said ankle brace bridging a gap between the prosthetic foot (3) and the lower leg piece (4) and comprising a main member (10) which is made of a flexible material and includes a cavity (6) for accommodating the prosthetic device (2). At least one reinforcement element (11) is arranged on the main member (10) in order to increase the inherent stability of the ankle brace (1).本發明係有關於一種用於具有義足(3)及小腿部件(4)之假肢裝置(2)的骨套筒,用於橋接該義足(3)與該小腿部件(4)之間的自由空間,包含由撓性材料製成之本體(10),該本體包括用於容納該假肢裝置(2)的空腔(6),其中,在該本體上(10)佈置有至少一用於提高該骨套筒(1)之固有穩定性的加固元件(11)。