Prosthetic implant, trial and associated method

Abstract

A kit ( 100 ) for use in performing joint arthroplasty on a head of a long bone ( 4 ) is provided. The kit ( 100 ) includes a first trial ( 102 ) including a first trial articulating surface ( 106 ) and an opposed first trial mounting surface ( 108 ) having a first trial location feature ( 110 ). The kit ( 100 ) also includes a second trial ( 104 ) including a second trial articulating surface ( 112 ) and an opposed second trial mounting surface ( 114 ) having a second trial location feature ( 116 ). The first trial articulating surface ( 106 ) and the second trial articulating surface ( 112 ) have different geometries and the first trial location feature ( 110 ) and the second trial location feature ( 116 ) have substantially identical geometries whereby different trials may be used with a common location feature.

1 . A kit for use in performing joint arthroplasty on a head of a long bone, said kit comprising: 
 a first implant including a first implant articulating surface and an opposed first implant mounting surface having a first implant location feature; and    a second implant including a second implant articulating surface and an opposed second implant mounting surface having a second implant location feature, the first implant articulating surface and the second implant articulating surface having different geometries and the first implant location feature and the second implant location feature having substantially identical geometries whereby different implants may be used with a common location feature.    
   
   
       2 . The kit of  claim 1 , wherein the first implant location feature and the second implant location feature comprise a tapered protrusion.  
   
   
       3 . The kit of  claim 1:   wherein the first implant articulating surface defines a first surface periphery thereof; and    wherein the second implant articulating surface defines a second surface periphery thereof, the first surface periphery being greater than the second surface periphery.    
   
   
       4 . The kit of  claim 1 , wherein at least one of the first implant articulating surface and the second implant articulating surface is generally hemispherical.  
   
   
       5 . The kit of  claim 1 , further comprising: 
 a first trial, corresponding to said first implant; and    a second trial corresponding to said second implant.    
   
   
       6 . The kit of  claim 7:   wherein said first trial includes a first trial articulating surface and an opposed first trial mounting surface having a first trial location feature; and    wherein said second trial includes a second trial articulating surface and an opposed second trial mounting surface having a second trial location feature, the first trial articulating surface and the second trial articulating surface having different geometries and the first trial location feature and the second trial location feature having substantially identical geometries whereby different trials may be used with a common location feature.    
   
   
       7 . The kit of  claim 1 , wherein the long bone is one of a humerus and femur.  
   
   
       8 . An implant for use in performing joint arthroplasty on a head of a long bone, said implant comprising a body having an arcuate articulating surface and an opposed mounting surface, the mounting surface including a portion thereof being generally planar.  
   
   
       9 . The implant of  claim 8 , further comprising a generally tapered cylindrical stem extending from the planar portion of the mounting surface of said body.  
   
   
       10 . The implant of  claim 9 , wherein said stem includes a first portion extending from the planar portion of the mounting surface of said body and a second portion extending from the first portion, the first portion adapted to position the implant in a humerus and the second portion adapted to secure the implant to the humerus.  
   
   
       11 . The implant of  claim 10 , wherein the second portion of said stem includes longitudinal flutes and a distal pointed nose.  
   
   
       12 . The implant of  claim 8 , wherein said body is generally a hollow hemisphere.  
   
   
       13 . The implant of  claim 10 , wherein the mounting surface of said body includes a portion thereof which is concave.  
   
   
       14 . The implant of  claim 8 , wherein the long bone is one of a humerus and a femur.  
   
   
       15 . A kit for use in selecting one of a plurality of humeral shoulder joint implants for use in shoulder arthroplasty, said kit comprising: 
 an instrument for preparing a surface on a humerus;    a first trial for cooperation with the humerus, said first trial having a first trial first portion fittable with the surface of the humerus and having a first trial second portion for cooperation with the glenoid cavity; and    a second trial for cooperation with the humerus, said second trial having a second trial first portion fittable with the surface of the humerus and having a second trial second portion for cooperation with the glenoid cavity, said first portion of said first trial and said first portion of said second trial being substantially identical and said second portion of said first trial and said second portion of said second trial being substantially different.    
   
   
       16 . The kit of  claim 15 , wherein the first trial first portion and the second trial first portion comprise a tapered protrusion.  
   
   
       17 . The kit of  claim 15:   wherein the first trial second portion defines a first surface periphery thereof; and    wherein the second trial second portion defines a second surface periphery thereof, the first surface periphery being greater than the second surface periphery.    
   
   
       18 . The kit of  claim 15 , wherein at least one of the first trial second portion and the second trial second portion is generally hemispherical.  
   
   
       19 . A method for providing joint arthroplasty comprising: 
 providing an instrument for preparing a surface on a long bone;    providing a plurality of trials, each of said trials being adapted to mate with the surface;    selecting one of the plurality of trials;    performing a trial reduction on said one of said plurality of trials;    determining if said one of said plurality of trials is satisfactory;    performing additional trial reductions as required;    selecting one of a plurality of joint prostheses corresponding to one of said plurality of trials based upon the trial reductions; and    implanting the selected one prosthesis onto the long bone.