Patent ID: 8167953

Claim:
A medical kit for thumb CMC joint arthroplasty, comprising: at least one thumb trapezium implant, wherein the at least one thumb trapezium implant comprises at least one downwardly extending anchoring member having a planar first portion with a constant thickness extending in a depth direction, the planar first portion having a perimeter with parallel straight short sides that merges into a lower second portion of the at least one anchoring member, the lower second portion having a substantially circular cross-sectional shape, wherein a cross-sectional size of the substantially circular shape is greater than a thickness of the planar first portion, and wherein the at least one anchoring member is configured to slidably enter a slot in a target trapezium having a corresponding shape as the at least one anchoring member from a radial surgical approach; at least one thumb first metacarpal intramedullary stem implant, wherein, in position, the thumb first metacarpal intramedullary implant and the trapezium implant articulate against each other; and at least one trapezium implant jig with at least one downwardly extending flat slot with parallel straight sides configured to define a bone preparation guide or template for preparing at least one slot in a target trapezium from a volar radial surgical approach, the slot sized and configured to slidably snugly accept the trapezium implant anchoring member from the volar radial surgical approach, wherein the trapezium implant jig comprises a plurality of substantially aligned spaced apart fixation apertures for accepting members to secure the jig in position during formation of the slot in the target trapezium, and wherein the jig comprises a substantially “L” shaped body with a top portion that merges into a downwardly extending side portion, with the side portion being substantially orthogonal to the top portion and having a shorter length, wherein the jig at least one downwardly extending slot is configured to continuously extend from the downwardly extending portion upward and across the top portion to define a substantially horizontal slot extending through a top surface of the jig, and wherein the at least one jig slot has a circular aperture on a lower end of the side portion.