Prosthesis with resorbable collar

Abstract

An articulating hemiarthroplasty prosthesis ( 10 ) for use in arthroplasty is provided. The prosthesis includes a stem ( 12 ) for implantation at least partially within the medullary canal ( 14 ) of a long bone ( 16 ) and a collar ( 20 ). The collar ( 20 ) is operably associated with the stem ( 12 ) and extends outwardly therefrom. At least a portion of the collar ( 20 ) includes a resorbable material. The prosthesis includes a head ( 30 ) and a cup ( 46 ) for engagement with the head ( 30 ).

1 . An articulating hemiarthroplasty prosthesis comprising: 
 a stem for implantation at least partially within the medullary canal of a long bone, and    a collar for positioning during surgery the prosthesis within the long bone, said collar being operably associated with said stem and extending outwardly therefrom, at least a portion of said collar comprising a resorbable material.    
   
   
       2 . The prosthesis of  claim 1:   wherein the prosthesis comprises an articulating hemiarthroplasty prosthesis,    further comprising a head operably associated with said stem, and    further comprising a cup for pivotable engagement with said head.    
   
   
       3 . The prosthesis of  claim 2 , wherein said stem and said head are integral with each other.  
   
   
       4 . The prosthesis of  claim 1  for use with bone cement, the bone cement forming a bone cement mantle over a portion of said stem: 
 wherein the portion of said collar extending outwardly from said stem is adapted to be resorbed by the body to provide controlled subsidence of said stem into the cement mantle of the prosthesis after the resorption of the collar; and    wherein said stem comprises a shape adapted to provide controlled subsidence of said stem into the cement mantle of the prosthesis.    
   
   
       5 . The prosthesis of  claim 1:   wherein an outer periphery of said stem defines an indentation therein; and    wherein said collar includes an outer surface thereof adapted to mate with the indentation.    
   
   
       6 . The prosthesis of  claim 5 , wherein said collar is inserted onto said stem by at least one of advancing said collar radially inwardly toward said stem and advancing said collar axially in a distal direction toward the indentation of said stem.  
   
   
       7 . (canceled)  
   
   
       8 . The prosthesis of  claim 1 , wherein said resorbable material comprises at least one of a polylactide, a polyglyolide, a vitamin E derivative, a glycerol, a gelatin and a polymer or a co-polymer.  
   
   
       9 . The prosthesis of  claim 1 , wherein at least one of said stem and said collar are adapted to provide for one of a selectable plurality of implantable positions of said collar with respect to said stem.  
   
   
       10 . The prosthesis of  claim 1 , wherein said collar is adapted to centralize said stem within the medullary canal.  
   
   
       11 . The prosthesis of  claim 1 , wherein said stem is adapted for use with bone cement.  
   
   
       12 . An articulating hemiarthroplasty prosthesis for use with bone cement, the bone cement forming a bone cement mantle over a portion of the prosthesis, said prosthesis comprising: 
 a stem for implantation at least partially within the medullary canal of a long bone,    a collar operably associated with said stem and extending outwardly therefrom, at least a portion of said collar comprising a resorbable material, and    a head, and    a cup for engagement with said ball, wherein prior to the resorbing of the resorbable material, said collar being adapted for positioning and supporting the prosthesis within the long bone and wherein subsequent to the resorbing of the resorbable material said prosthesis being adapted to provide controlled subsidence of said stem into the cement mantle of the prosthesis.    
   
   
       13 . The prosthesis of  claim 12:   wherein an outer periphery of said stem defines an indentation therein; and    Wherein said collar includes an outer surface thereof adapted to mate with the indentation.    
   
   
       14 . (canceled)  
   
   
       15 . The prosthesis of  claim 12 , wherein said resorbable material comprises at least one of polylactide, a polyglyolide, a vitamin E derivative, a glycerol, a gelatin and a polymer or a co-polymer.  
   
   
       16 . The prosthesis of  claim 12 , wherein at least one of said stem and said collar are adapted to provide for one of a selectable plurality of implantable positions of said collar with respect to said stem.  
   
   
       17 . The prosthesis of  claim 12 , wherein said collar is adapted to centralize said stem within the medullary canal.  
   
   
       18 . The prosthesis of  claim 12 , wherein said stem is adapted for use with bone cement.  
   
   
       19 . A hip stem for use in arthroplasty comprising: 
 a stem for implantation at least partially within the medullary canal of a long bone; and    a collar operably associated with said stem and extending outwardly therefrom, at least a portion of said collar comprising a resorbable material.    
   
   
       20 . The hip stem of  claim 19:   wherein an outer periphery of said stem defines an indentation therein; and    wherein said collar includes an outer surface thereof adapted to mate with the indentation.    
   
   
       21 . The hip stem of  claim 19  adapted for use with bone cement, the bone cement forming a bone cement mantle over a portion of said stem.  
   
   
       22 . The hip stem of  claim 21 , wherein said stem is adapted to provide controlled subsidence of said stem into the cement mantle of the prosthesis after the resorption of the collar.  
   
   
       23 . The hip stem of  claim 19 , wherein said resorbable material comprises at least one of a polylactide, a polyglyolide, a vitamin E derivative, a glycerol, a gelatin and a polymer or a co-polymer.  
   
   
       24 . The hip stem of  claim 19 , wherein at least one of said stem and said collar are adapted to provide for one of a selectable plurality of implantable positions of said collar with respect to said stem.  
   
   
       25 . A collar for use with a stem for use in arthroplasty, the collar being extendable outwardly from the stem, at least a portion of said collar comprising a resorbable material.  
   
   
       26 . The collar of  claim 25  for use with a stem and with bone cement, the bone cement forming a bone cement mantle over a portion of the stem, said collar being adapted for positioning and supporting the prosthesis within the long bone and wherein subsequent to the resorbing of the resorbable material said prosthesis being adapted to provide controlled subsidence of said stem into the cement mantle of the prosthesis.  
   
   
       27 . The collar of  claim 25 , wherein said resorbable material comprises at least one of polylactide, a polyglyolide, a vitamin E derivative, a glycerol, a gelatin and a polymer or a co-polymer.  
   
   
       28 . The collar of  claim 25 , wherein said collar is adapted to centralize said stem.  
   
   
       29 . (canceled)  
   
   
       30 . (canceled)  
   
   
       31 . (canceled)