Abstract: A fixation device for securing a prosthetic ligament to a bone and which comprises a bone staple having a head portion by means of which the staple can be driven into the bone, and a pair of legs extending from the head and having ends engageable into the bone, characterized by a stirrup for guiding the driving movement of the staple and arranged also to cooperate with the staple in order to enable the prosthetic ligament to engage the staple and the stirrup and to be securable to the bone upon completion of driving of the staple into the bone, the stirrup comprising two generally parallel side portions which define guides to receive the legs of the staple and to guide the driving movement of the legs, and also defining an aperture through which the ligament can be taken prior to securement of the ligament to the bone.