Carpometacarpal joint prosthesis
AssigneeAscension Orthopedics, Inc.
InventorsWilliam F. Ogilvie, Charles W. Mumme, Ian A. Trail
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Abstract
Hemi joint replacements for the base of the first metacarpal of the CMC joint are provided which can effectively restore and reestablish functional joint mechanics while preserving the soft tissues that contribute to joint stability and function. The implants have a unique head shape with a saddle-like articular surface that is shaped somewhat similar to a conventional bicycle seat. A set of four proportionately larger and smaller implants allows a surgeon to choose the appropriately sized prosthesis for implantation in respect of the metacarpal osteotomy.
Claims14
A hemi joint replacement implant for the base of the first metacarpal of the CMC joint, which implant has a head section and a stem section, said head section having a flat distal collar surface oriented transverse to the stem from which the stem extends, and also having a saddle-shaped proximal articular surface, said proximal surface being convex in a lateral plane and concave in a dorsal-volar plane, and said head section having a peripheral surface which includes a planar central dorsal surface section of a length at least about one-half the width of said head section flanked by a pair of dorsal side surfaces that extend to arcuate lateral surfaces that are connected to a volar arcuate surface.
Dependencies are inferred from the claim text.