sub 6 is substantially equal to the inner diameter d sub 2 of the bore 2 according to the invention two orifices 7 are provided in the shank 5 and are capable of receiving a suture thread 8 or other flexible tie when such a thread is engaged in one of the orifices 7 it is possible to exert on the thread 8 an effort of traction t which is transmitted by the thread 8 to the shank 5 as represented by arrow t u2032 in fig2 in this way by pulling on the thread 8 the surgeon introduces the shank 5 in the bore 2 without having to exert an effort of thrust on the head 4 which may be difficult to access due to the surrounding ligamentary system in other words it suffices for the surgeon to place a thread in one of the orifices 7 to pass the two strands of the thread 8 in the bore 2 via the inner face of the malleolus then to pull the strands via the outer side of the malleolus the traction on the thread 8 has the effect of introducing the shank 5 of the implant 1 in the bore 2 and of applying the head 4.