Prosthetic wrist implant

摘要

A wrist implant requires minimal resection of the distal radius and preserves the sigmoid notch and articulation with the head of the distal ulna. The wrist implant generally includes a radius portion, a carpal portion and a carpal ball. The wrist implant includes a primary articulation and a secondary rotational articulation. The primary articulation occurs between the radius portion and the carpal ball. The secondary articulation occurs between the carpal ball and the carpal portion.

主权项

1. An implantable wrist prosthesis for implantation in a patient's wrist, the patient's wrist including a distal end of a radius bone presenting a substantially concave end surface contour and a carpus, the implantable wrist prosthesis comprising:
a radius component comprising an articular receiver and an intramedullary stem extending from the articular receiver, the articular receiver having an inner receiver wall and further having an outer receiver wall with a convex curvature adapted to substantially conform to a curvature of the concave end surface at an unresected distal end of the patient's radius bone, the outer receiver wall having a major curvature along a major dimension and a minor curvature along a minor dimension; a carpal plate having a bone interface surface, an articular surface opposite the bone interface surface, a first hole for receiving a first carpal screw, a second hole for receiving a second carpal screw; and a carpal piece for positioning between the radius component and the carpal plate, the carpal piece including a back surface configured to articulate relative to and in engagement with the articular surface of the carpal plate about a rotational axis.