Abstract: A set of tools for installation of a stem implant into a bone comprises a stem-shaped priming tool 1 having a distal tip 32 and a plurality of cutting teeth 31 along a length thereof and a plurality of stem-shaped broaches 2, 3, 4, 5, 6 of different size. Each of the broaches have a distal tip and a plurality of cutting teeth along a length thereof. The priming tool 1 is shorter than, has more cutting teeth 31 per unit length, and has a sharper distal tip 32 than the smallest broach.

Abstract: An intramedullary stem (1) is for a CMC joint implant. It has a distal bone-engagement end (10) and a proximal end (11) for engaging an articulation component such as a ball to complete a ball-and-socket coupling to a trapezium-contacting platform. The stem has an integral body (2) of material with an external surface for engaging a bone and with an aperture (3) leading to a socket (4) in the proximal end for engaging an articulation component ball or the like. The stem comprises a proximally extending projecting portion 5) which partly surrounds the socket. It is of PEEK material, which provides the desired strength and bone-contacting properties. The stem may have a coating over an elongate portion (203) of the surface extending distally and also in a ring (204) around the proximal end, to achieve optimum adhesion without excessive difficulty in extraction during revision surgery.

Abstract: A set of tools for installation of a stem implant into a bone comprises a stem-shaped priming tool (1) having a distal tip (32) and a plurality of cutting teeth (31) along a length thereof and a plurality of stem-shaped broaches (2, 3, 4, 5, 6) of different size. Each of the broaches have a distal tip (32) and a plurality of cutting teeth (31) along a length thereof. The priming tool (1) is shorter than, has more cutting teeth (31) per unit length, and has a sharper distal tip (32) than the smallest broach.

Abstract: An articulation component (1, 100) is for a bone joint hemiarthroplasty implant having an intramedullary stem (50) with a socket (53). The articulation component has a proximal saddle (2, 110) for non-engaging abutment with a proximal bone and a ball (4, 104) for engaging in the stem socket (53). The saddle has a distally facing recessed surface (10, 110) for engagement with the stem proximally facing surface (55) to define limits of articulation, in one case a cone of motion of about 60° with minimal risk of socket dislocation. Also, the saddle has an enlarged lateral-most edge portion (11, 111, 211) on two diametrically opposed sides of the neck, for conformity with a patients' anatomy.

Abstract: A set of tools for installation of a stem implant into a bone comprises a stem-shaped priming tool (1) having a distal tip (32) and a plurality of cutting teeth (31) along a length thereof and a plurality of stem-shaped broaches (2, 3, 4, 5, 6) of different size. Each of the broaches have a distal tip and a plurality of cutting teeth along a length thereof. The priming tool (1) is shorter than, has more cutting teeth (31) per unit length, and has a sharper distal tip (32) than the smallest broach.

Abstract: A set of tools for installation of a stem implant into a bone comprises a stem-shaped priming tool (1) having a distal tip (32) and a plurality of cutting teeth (31) along a length thereof and a plurality of stem-shaped broaches (2, 3, 4, 5, 6) of different size. Each of the broaches have a distal tip and a plurality of cutting teeth along a length thereof. The priming tool (1) is shorter than, has more cutting teeth (31) per unit length, and has a sharper distal tip (32) than the smallest broach.

Abstract: A set of tools for installation of a stem implant into a bone comprises a stem-shaped priming tool (1) having a distal tip (32) and a plurality of cutting teeth (31) along a length thereof and a plurality of stem-shaped broaches (2, 3, 4, 5, 6) of different size. Each of the broaches have a distal tip (32) and a plurality of cutting teeth (31) along a length thereof. The priming tool (1) is shorter than, has more cutting teeth (31) per unit length, and has a sharper distal tip (32) than the smallest broach.