Modular femoral stem component for a hip joint prosthesis

Abstract

A prosthetic femoral stem component comprising a body element, a neck element and a stem, element, with the body element, neck element and stem element being secured to one another with a modular connection, wherein the modular connection comprises a taper junction and an engaged-fit junction.

1 .- 26 . (canceled) 
     
     
         27 . A modular connection for interconnecting a plurality of elements to form a prosthetic femoral stem component, said modular connection comprising, in combination, a taper junction and an engaged-fit junction;
 the taper junction being formed by interaction of a first taper with a second taper; and   the engaged-fit junction being formed by interaction of a first concentric wall with a second concentric wall, the first concentric wall being deformed so as to be pressure locked against the second concentric wall; wherein   the first taper is disposed on a shaft of a neck element; and   the second taper is disposed on a portion of a sidewall defining an aperture extending through a body element; and wherein   the first concentric wall is disposed on a shaft portion of a neck element; and   the second concentric wall is formed along a portion of a sidewall defining an aperture extending through a body element.   
     
     
         28 . The modular connection in accordance with  claim 27 , wherein the first concentric wall is expanded radially and thereby pressure-locked against the second concentric wall. 
     
     
         29 . A prosthetic femoral stem component comprising a body element, a neck element, and a stem element secured to one another by a modular interconnection; wherein
 the interconnection comprises a taper junction and an engaged-fit junction, the engaged-fit junction being formed by interaction of a first concentric wall and a second concentric wall, the first concentric wall being formed on a shaft of said neck element, and the second concentric wall being formed on a sidewall defining an aperture extending through said body element; wherein   said taper junction comprises cooperative interaction of a first taper and a second taper, the first taper being formed on a shaft of said neck element, and said second taper being formed on a sidewall of an aperture extending through said body element.   
     
     
         30 . The prosthetic femoral stem component in accordance with  claim 29  wherein the first concentric wall is disposed internally of the second concentric wall. 
     
     
         31 . The prosthetic femoral stem component in accordance with  claim 30  wherein the first concentric wall is expandable radially to engage the second concentric wall in pressure locking fashion. 
     
     
         32 . A prosthetic hip joint comprising a prosthetic femoral stem component and a prosthetic acetabular cup component, said femoral stem component comprising a body element, a neck element, and a stem element secured to one another in a modular connection, such that said modular connection comprises a taper junction in combination with an engaged-fit junction;
 the engaged-fit junction comprising a first concentric wall interacting with a second concentric wall, the first concentric wall being deformed and pressure-locked against the second concentric wall.   
     
     
         33 . A modular femoral stem component for a hip joint prosthesis, the component comprising:
 a neck element assembly comprising a ball at a first end thereof and a shaft at a second end thereof, the shaft exhibiting a frusto-conically shaped portion and a cylindrically shaped portion, the ball being adapted for seating in an acetabular cup, and the shaft being adapted for connection to a stem element adapted for seating in a femur medullary canal; and   a body element having an aperture therein, the aperture exhibiting a frusto-conically shaped portion engageable with the shaft frusto-conically shaped portion, and a cylindrically-shaped portion engageable with the shaft cylindrically-shaped portion;   wherein a selected one of the cylindrically-shaped portions is deformable so as to be pressure locked against the other of the cylindrically-shaped portions.