Femoral implant

摘要

A femoral implant (10) comprises a distal end and a proximal end. A stem (12) is provided at the distal end of the implant (10) and comprises a rounded tip (16) for insertion into a femur, in use, and a body (18) of generally tapering form extending in a distal direction from a base to the tip (16). A femoral head (14) is provided at the proximal end of the implant (10) and extends from the base (20) of the stem (12). The body (18) of the stem (12) includes a plurality of discrete steps (22, 24, 26, 28, 30), located between the tip (16) and the base (20), and the steps (22, 24, 26, 28, 30) are concentrated more towards the base (20) of the stem (12) than towards the tip (16).

主权项

1. A femoral implant comprising:
a distal end and a proximal end; a substantially straight stem provided at the distal end of the implant, the stem comprising a body of generally tapering form extending in a distal direction from a proximal base to a rounded distal tip for insertion into a femur; and a femoral head provided at the proximal end of the implant and extending from the base of the stern; wherein the body of the stem includes a plurality of discrete steps located between said tip and said base, wherein the steps are concentrated more towards the base of the stem than towards the tip, wherein the steps are distributed along the body such that the distance between each adjacent step gradually decreases towards the base and the steps have stop surfaces with widths that gradually increase towards the base, wherein the stop surface of one or more of the steps is a planar distal stop surface extending substantially radially outwardly from the longitudinal axis of the stem, wherein one or more of the steps include a substantially cylindrical side surface extending generally parallel to the longitudinal axis of the stem, and wherein the steps are configured such that at least the most distal step will have a press-fit engagement into the prepared bone of the femur, and at least the most proximal step will have a line-to-line fit engagement into the prepared bone of the femur.