US 2008/0167723 A1 · PROSTHETIC HIP IMPLANTS

Abstract

Prosthetic hip stems for use in prosthetic hip joints and, in particular, provides prosthetic hip stems that are designed to achieve more optimized outcomes with certain types of patient anatomy, such as the anatomy of female patients and/or patients having osteoporosis. Each hip stem in a family or set of hip stems has diaphyseal width, metaphyseal width, offset, and head height dimensions. In a set of hip stems of increasing nominal size, the diaphyseal width dimension increases substantially non-proportionally to the corresponding increase of the metaphyseal width, offset, and head height dimensions, thereby providing a family or set of hip stems that is particularly adapted for patients having osteoporosis, in which the cortical bone of the diaphysis of the femur becomes thinner with progression of the osteoporosis.

Claims23

Dependent claims

A set of prosthetic hip stems, comprising:

a plurality of hip stems of increasing nominal size, each said hip stem having a distal width dimension x between 12 and 21 mm;
said hip stems each having a metaphyseal width dimension y1 defined as a function of x falling within a conceptual boundary defined between the following lines:
y1=0.053x+19.17 and
y1=0.031x+24.61;
said hip stems each having an offset dimension y2 defined as a function of x falling within a conceptual boundary defined between the following lines:
y2=31 and
y2=1.46x+19.86;
and
said hip stems each having a head height dimension y3 defined as a function of x falling within a conceptual boundary defined between the following lines:
y3=0.57x+10.54 and
y3=1.21x+11.82.

8 more elements

Dependencies are inferred from the claim text.

Prosthetic hip implants

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Prosthetic hip implants

Life of this patent

Abstract

Claims23