This anchor (1) includes two parts (2, 3) that are to be assemble: an outer part (2), forming at least a first jamming surface (16a) for jamming the suture thread (100); and an inner part (3), intended to be inserted and retained in the outer part (2), which forms a transverse conduit (21) and at least a second jamming surface (25) for jamming the suture thread (100).