A prosthesis (1) for the trapeze-metacarpal joint of the thumb comprises a body (2) suitable for being arranged between the scaphoid (31) and the metacarpus (30) of the thumb, such body (2) has the shape of an Archimedean solid and operates as a spacer between said scaphoid (31) and metacarpus (30).

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.

An implant couples a first bone of a hand to a second bone of the hand. The implant includes a body that defines a median plane. The body also defines a first joint surface having a first central region that articulates with the first bone. The body further defines a second joint surface having a second central region that articulates with the second bone, and the second central region is disposed on an opposite side of the median plane of the body relative to the first central region. The first and second central regions correspond to profiles of first and second axial segments, respectively, the first and second axial segments are each one of a cylinder, a cone and a torus and are centered on first and second axes, respectively, and the first and second axes, as projected on the median plane, are substantially perpendicular to each other.

Tool (1) for reaming a trapezium bone (2) when implanting a joint prosthesis (15, 16, 17) in the thumb (4), in which the tool has a head (5) and a handle (6) which extend along an axis (7), in which a connecting piece (8) is provided between the head and the handle, which connecting piece lies at a distance (9) from the axis in such a way that when rotating the head back and forth (13) using the handle the connecting piece moves at a distance from the thumb while the axis runs through the thumb.

A procedure and device that resolves CMC arthritis by mimicking a thumb CMC joint fusion, while avoiding common shortcomings of the fusion surgery as well as existing alternative surgeries for thumb CMC arthritis which can also replace the trapezium bone in the carpometacarpal joint with a stemmed trapezial implant. In addition, the trapezial implant device replicates skeletal anatomy and is configured to directly contact native bone and cartilage in order to more evenly distribute stresses.

Thumb carpometacarpal (CMC) joint implants include a trapezium implant defining an articulating surface and a cooperating first metacarpal implant with a base portion of the first metacarpal defining an articulating surface. The first metacarpal base articulating-surface is configured to articulate against the trapezium implant articulating surface.

In one embodiment, the present invention is an anchoring rod that is elongated and tapered, the rod extends from a distal end toward a proximal end, the shape including a palmate side, a dorsal side and lateral sides, is the shape being flared on its palmate side without flaring on its dorsal side and flares on its lateral sides so as to form a flared proximal portion, said flared proximal portion having a substantially trapezoidal cross-section, with a dorsal face larger than the palmate face.

An implant couples a first bone of a hand to a second bone of the hand. The implant includes a body that defines a median plane. The body also defines a first joint surface having a first central region that articulates with the first bone. The body further defines a second joint surface having a second central region that articulates with the second bone, and the second central region is disposed on an opposite side of the median plane of the body relative to the first central region. The first and second central regions correspond to profiles of first and second axial segments, respectively, the first and second axial segments are each one of a cylinder, a cone and a torus and are centered on first and second axes, respectively, and the first and second axes, as projected on the median plane, are substantially perpendicular to each other.

A hemi-arthroplasty bone joint implant has a first part (120) with a stem (111) tor intramedullary implanting into a metacarpal, and a second part (110) to engage the trapezium is a translational manner, a hemi-arthroplasty articulating coupling (121). This allows multi-axial motion with translational movement of the second part over the trapezium and rotation of the first part (110) about the articulating coupling (121, 103). There is also a converter to convert the implant to a toral arthroplasty implant in situ during revision surgery. The second part (110) and the hemi-arthroplasty coupling (100, 123, 121) are removable in situ during revision surgery. The first part (120) has an engagement threaded socket (117) for, after removal of the second part and the hemi-arthroplasty coupling, engaging the replacement coupling (200) and allowing mutual articulation of the first (120) and replacement parts (220). This forms a total arthroplasty joint implant.

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.