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Variable modulus prosthetic hip stem

  • US 6,228,123 B1
  • Filed: 08/19/1998
  • Issued: 05/08/2001
  • Est. Priority Date: 08/19/1998
  • Status: Expired due to Fees
First Claim
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1. A prosthesis of the type including at least a stem having a distal root portion for insertion into an intramedullary cavity and a proximal portion for supporting a head or junction componentwherein said proximal portion is solid and extends into the intramedullary cavity for a length effective to couple to surrounding bone for stress-transmissive engagement therewith, and said distal root portion extends from said proximal solid portion and includes a cable comprising a plurality of strands extending in a generally densely packed space-filling contiguity centrally in said cavity, the strands being selected to achieve a bending modulus of the distal root less than a bendibg modulus of said proximal portion and the natural femur such so to provide a stimulating level of strain transmission to distal bone while limiting load bearing function and thereby avoid stress shielding.

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