Abstract: A jig for resurfacing the head of a femur comprises a centering guide defining a centering axis. It further comprises: a support suitable for fitting on a head of the femur and defining an envelope surface forming a portion of a sphere, the centering guide being fastened to the support with the centering axis aligned on a diameter of the sphere; and at least one abutment arm for coming into abutment against a predefined portion of a neck of the femur, the abutment arm being connected to the support and having a distal end that bears against the corresponding predefined portion when the support is fitted on the head of the femur with the centering axis aligned on the central axis of the neck of the femur or with a small amount of valgus.

Abstract: A device for setting a total knee prosthesis includes: a tensioning component (1) having: a tibial plate (2), a slide (5) mobile along a rail (3) and elements (6, 11) for being fixed to an ancillary component including a centro-medullar rod and a tibial plate and capable of receiving variable-width wedging elements; and a motoring elements (8, 10) for tensioning the knee when the plate is applied on a tibial section and the ancillary component (20) secured to the slide, a perforating guide capable of being mounted on the rail (3) and having drilling holes; the guide capable of including or of being associated with a member for palpation of the anterior part of the femur; and locating elements (EF) for determining the interarticular space available in flexure, thereby enabling the distal femoral section plane or the posterior section plane to be accurately determined.