The invention relates to a locking ring (20) for a threaded holding pin (18) to be screwed into a part of a bone (14), said ring including a first portion (22) having an axial bore (24) for receiving said holding pin, the periphery of said first portion being threaded so as to interact with a holding plate (12), wherein said ring in characterized in that the same further comprises, as an extension to said first portion, a second portion (28), said second portion being deformable and thus capable of blocking said ring on said pin by deformation.
