Abstract: A surgical instrument (10) is described for the implanting of acetabular components of hip prostheses. The instrument comprises a main stem (12) which acts as a dynamometric impactor for obtaining the implantation of the acetabular component and which comprises at least one torsional dynamometer (14), coaxial to the main stem (12), for the application and measuring of a torsional moment on the acetabular component implanted. The instrument also comprises a side mechanism (16), which includes a secondary stem (18), parallel to the main stem (12), a handle (20) and at least one axial dynamometer (22), orthogonal to the stem (18), which connects the secondary stem (18) to the handle (20) for the application and measuring of a destabilizing force on the acetabular component implanted.

Abstract: The present invention provides a prosthetic implant 1 which includes a stem 2 having two lateral fins 20. The lateral fins 20 extend outwardly from the lateral side 6 of the stem 2, such that the lateral face 21 of each fin 20 is flush with the lateral side 6 of stem 2.

Abstract: The stem is formed in the distal zone with a hollow and a longitudinal slot. The hollow is increasingly offset medially from the stem axis in the proximal direction while the slot is disposed in a plane defined by the longitudinal axis of the stem and neck axis. The stem has a resilience which increases distally within the distal zone to accommodate re-operation procedures while resisting lateral loadings imposed via the femoral head.