Abstract: A rotatable brace for a prothesis includes a pair of straps, each one connected to one of two wrapping supports secured on opposite sides of an ankle or wrist joint, a pivot joint including a pivot pin connecting the straps, a washer of polytetrafluoroethylene material interposed between the straps and surrounding the pivot pin and having a plurality of ports positioned radially outwardly of the pivot pin, with one end of one strap being of reduced width and having a semicircular end, shoulders joining the portion of reduced width with the main part of the strap, a number of threaded ports in the other of the straps axially aligned with respect to the ports in the washer, and a pair of screws passing through selected ports in the washer and threadedly engaged with the aligned threaded ports such that the brace can be rotated only until the shoulders abut against the heads of the screws.