Prosthetic finger joint.

摘要

There is disclosed a prosthetic finger joint (10) for implantation between two finger bone sections (11 and 12), and which comprises a stem (13) for introduction into a passage (14) formed in the first finger section (11), and a part spherical head (15) provided at one end of the stem (13) to permit pivotting of the second bone section (12) relative to the first bone section (11). The head (15) defines a hemispherical bearing surface (16) over which the finger section (12) can pivot through approximately 90 DEG , and it has a planar seating face (17) which engages an inclined end face (18) of the first finger section (11) after implantation surgery. The seating face (17) is non-perpendicularly inclined to the general axis of the passage (14) in the first finger bone section (11), and the stem (13) projects non-perpendicularly from the seating face (17) to be received by the passage (14). A prosthetic socket section (23) is mounted in the second finger bone section (12), and comprises a cup (24) which slidably engages the outer surface (16) of the head (15), and an integral stem (25) which is introduced into a passage (26) formed in the second bone section (12). The stems (13 and 25) can be anchored in position using acrylic bone cement, or in some embodiments the anchoring in position may be cementless, by virtue of the construction of the stems.