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EP0241846A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Femoral prosthesis for total hip replacement

Assignee: Hospital for Special Surgery
•
Filing: 1987-04-07
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Granted: —
•
Expires: 2007-04-07
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Abstract

Abstract A femoral component for a hip joint prosthesis com­prises a proximal portion (10) adapted to be received in the intertrochanteric region of a femur, a neck portion (26) extending obliquely medially, anteriorly and super­iorly from the proximal portion (10) and adapted to be joined to a femoral head element, and a stem portion (38) smoothly merging with and extending inferiorly from the proximal portion (10). The proximal portion (10) has anterior and prosterior aspects (18, 20) that converge medially and inferiorly and intersect a rounded medial aspect (12) oriented obliquely to the stem portion (38) both anteriorly and medially, said aspects (18, 20) de­fining a generally wedge-shaped body adapted to engage the endosteal surfaces of the femur in the intertrochanteric region such that substantially all loads are transmitted from the component to the bone in the intertrochanteric region and load transfers through other surfaces are mini­mized.

Inventors

  • 👤 Chitranjan S. Ranawat
  • 👤 Albert H. Burstein
  • 👤 Donald L. Bartel

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 22:38
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30153; A61F2002/30154; A61F2002/30158; A61F2002/30182; A61F2002/30187; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2/3094; A61F2/30942; A61F2002/30952; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0019; A61F2230/0021; A61F2230/0026; A61F2230/0028; A61F2230/0034; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 158 words
A femoral component for a hip joint prosthesis adapted to be implanted in the proximal portion of a femur for biological retention without a cement having a proximal portion adapted to be received in the intertrochanteric region of a femur, a neck portion extending obliquely medi­ally, anteriorly and superiorly from the proximal portion and adapted to be joined to a femoral head element, and a stem portion smoothly merging with and exending inferiorly from the proximal portion, characterized in that the proximal por­tion has anterior and prosterior aspects that converge medially and inferiorly and intersect a rounded medial aspect oriented obliquely to the stem portion both anteriorly and medially, said aspects defining a generally wedge-shaped body adapted to engage the endosteal surfaces of the proximal medial portion of the femur in the intertrochaneric region such that compressive loads are transmitted from the component to the bone in the intertrochanteric region and load transfers through other surfaces are minimized.
Claim 2
Dependent Claim 158 words
A femoral component for a hip joint prosthesis adapted to be implanted in the proximal portion of a femur for biological retention without a cement having a proximal portion adapted to be received in the intertrochanteric region of a femur, a neck portion extending obliquely medi­ally, anteriorly and superiorly from the proximal portion and adapted to be joined to a femoral head element, and a stem portion smoothly merging with and exending inferiorly from the proximal portion, characterized in that the proximal por­tion has anterior and prosterior aspects that converge medially and inferiorly and intersect a rounded medial aspect oriented obliquely to the stem portion both anteriorly and medially, said aspects defining a generally wedge-shaped body adapted to engage the endosteal surfaces of the proximal medial portion of the femur in the intertrochaneric region such that compressive loads are transmitted from the component to the bone in the intertrochanteric region and load transfers through other surfaces are minimized.
Claim 3
Dependent Claim 15 words
A component according to claim 1 wherein said anterior and posterior aspects are planar surfaces.
Claim 4
Dependent Claim 54 words
A component according to claim 1 and further characterized in that there is a recess extending continuously along the medial portions of the anterior and posterior aspects and across the medial aspect, and the recess contains a porous medium adapted to accept bone ingrowth at the calcar region of the femur for biological retention.

References Cited (Backward Citations)

FR2215927A1 Cited
DE3003050A1 Cited
US4550448A Cited
EP0128036A1 Cited
US4536894A Cited
US4608055A Cited
EP0163013A1 Cited

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