Universal modular prosthesis stem extension
First Claim
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1. A modular prosthesis systems comprising:
- (a) a prosthetic head having an undersurface;
(b) mounting means on said undersurface including at least one flat surface;
(c) a plurality of diverse stem extensions, each stem extension having a shank with a flat surface complementary to the flat surface of said mounting means; and
an elongated stem portion connected to its respective shank defining an obtuse angular relationship between said shank and a longitudinal axis of said stem portion; and
(d) attachment means for fixedly attaching a said shank to said mounting means;
(e) said shank being attachable to said mounting means in at least two diverse fixed orientations wherein each said stem portion is connected to its respective shank at an angular relationship corresponding with an inclination of a bone which said stem is intended to be inserted.
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Abstract
The present invention relates to a universal modular prosthesis stem extension designed to be attachable on the undersurface of a femoral or tibial standard prosthesis. The stem extension forms a part of a modular system wherein a single stem extension could be selectively attached to any one of a multiplicity of femoral or tibial components, thus reducing the amount of inventory which is necessary to be maintained by a surgeon. In the preferred embodiment of the inventive stem extension, each stem extension is designed with a 6 degree valgus inclination and is reversible for left and right patients.
275 Citations
16 Claims
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1. A modular prosthesis systems comprising:
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(a) a prosthetic head having an undersurface; (b) mounting means on said undersurface including at least one flat surface; (c) a plurality of diverse stem extensions, each stem extension having a shank with a flat surface complementary to the flat surface of said mounting means; and
an elongated stem portion connected to its respective shank defining an obtuse angular relationship between said shank and a longitudinal axis of said stem portion; and(d) attachment means for fixedly attaching a said shank to said mounting means; (e) said shank being attachable to said mounting means in at least two diverse fixed orientations wherein each said stem portion is connected to its respective shank at an angular relationship corresponding with an inclination of a bone which said stem is intended to be inserted. - View Dependent Claims (6, 7, 8, 9, 13, 14, 15, 16)
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- 2. The invention of claim 2, wherein each stem extension is reversible and said attachment means is provided for installation on either a left-hand or right-hand prosthetic head mounting means.
Specification