Tibial trialing assembly and method of trialing a tibial implant

Abstract

A trialing assembly for use during knee replacement procedures to determine size and position of a tibial plate implant as well as the size and thickness of the articular surface prior to implantation of the implant. The trialing assembly includes a broaching plate having a tibia engaging bottom surface adapted for placement atop a tibia and an opposite top surface, the bottom and top surfaces extending between an anterior edge and a posterior edge of the broaching plate. The broaching plate includes an anterior rail and a posterior rail protruding superiorly from the top surface and extending along the anterior and posterior edges, respectively. A trialing plate is configured to removably fit atop the broaching plate between the anterior and posterior rails. The trialing plate includes an engagement member extending from a superior surface of the trialing plate and adapted to engage with an articular surface provisional.

1 . A trialing assembly for use during a knee replacement procedure to size and prepare a resected tibia for receiving a tibial implant and to trial an articular surface provisional, said trialing assembly comprising: 
 a broaching plate having an outer periphery, said broaching plate including a bottom surface adapted for placement atop the resected tibia and an opposite top surface, and a plurality of alignment rails protruding from said top surface, each alignment rail extending adjacent at least a portion of said outer periphery; and    a trialing plate removably positionable atop said broaching plate between said plurality of alignment rails, said trialing plate having a superior surface and an articular surface provisional engagement member extending superiorly from said superior surface.    
   
   
       2 . The trialing assembly of  claim 1  wherein said plurality of alignment rails includes an anterior rail extending adjacent an anterior portion of said outer periphery and a posterior rail extending adjacent a posterior portion of said outer periphery.  
   
   
       3 . The trialing assembly of  claim 1  wherein said trialing plate overlies substantially all of said top surface of said broaching plate when said trialing plate is positioned atop said broaching plate.  
   
   
       4 . The trialing assembly of  claim 1  wherein said broaching plate includes at least one fastener hole configured for receipt of a fastener therethrough for engagement with the resected tibia.  
   
   
       5 . The trialing assembly of  claim 4  wherein said fastener includes a head, said head engaging, and extending superiorly from, said top surface of said broaching plate when said fastener is received within said at least one fastener hole, said trialing plate including at least one opening, said at least one opening aligned with said at least one fastener hole and receiving said fastener head when said trialing plate is positioned atop said broaching plate.  
   
   
       6 . The trialing assembly of  claim 1  wherein said engagement member includes a trialing plate removal element.  
   
   
       7 . The trialing assembly of  claim 1  wherein each of said plurality of alignment rails includes an upper surface, said superior surface of said trialing plate being substantially level with said upper surface of each of said plurality of alignment rails when said trialing plate is positioned atop said broaching plate.  
   
   
       8 . A trialing assembly for trialing an articular surface provisional prior to implantation of the tibial implant on a resected tibia, the trialing assembly comprising: 
 a broaching plate having an outer periphery surrounding a bottom surface adapted for placement atop the resected tibia and an opposite top surface; and    a trialing plate removably disposed atop said broaching plate and overlying substantially all of said top surface, said trialing plate including an articular surface provisional engagement member extending superiorly from a superior surface of said trialing plate.    
   
   
       9 . The trialing assembly of  claim 8  wherein said member includes a trialing plate removal element.  
   
   
       10 . The trialing assembly of  claim 9  wherein said member includes an outer wall, and said trialing plate removal element includes a groove within said outer wall.  
   
   
       11 . The trialing assembly of  claim 8  wherein said broaching plate includes at least one alignment rail protruding superiorly from said top surface.  
   
   
       12 . The trialing assembly of  claim 11  wherein said at least one alignment rail includes an anterior rail extending along an anterior portion of said outer periphery and a posterior rail extending along a posterior portion of said outer periphery.  
   
   
       13 . The trialing assembly of  claim 8  further comprising a provisional base plate having a base plate periphery surrounding an upper surface and an opposite lower surface, said lower surface adapted for placement atop the resected tibia, said provisional base plate having a stem projecting from said lower surface and adapted for insertion into the resected tibia, said base plate having at least one alignment rail projecting from said upper surface, said trialing plate removably positionable atop said provisional base plate and engagable with said at least one alignment rail to prevent movement of said trialing plate relative said base plate along a plane of the upper surface of said base plate.  
   
   
       14 . The trialing assembly of  claim 1  wherein one of said plurality of alignment rails includes a notch and said trialing plate includes a tab, said tab configured to be received in said notch when said trialing plate is positioned atop said broaching plate.  
   
   
       15 . The trialing assembly of  claim 8  wherein said trialing plate includes an inferior surface opposite said superior surface, and wherein one of said inferior surface of said trialing plate and said top surface of said broaching plate includes at least one alignment member extending outwardly therefrom, and the other of said inferior surface of said trialing plate and said top surface of said broaching plate includes at least one alignment member opening, said at least one alignment member opening receiving said at least one alignment member.  
   
   
       16 . The trialing assembly of  claim 8  wherein said broaching plate includes at least one fastener hole and said trialing plate includes a head receiving opening aligned with each of said at least one fastener holes.  
   
   
       17 . The trialing assembly of  claim 8  wherein said trialing plate includes a central bore extending through said boss and said trialing plate and configured to receive a fastener therethrough to fix said trialing plate to the resected tibia.  
   
   
       18 . The trialing assembly of  claim 8  wherein each of said broaching plate and trialing plate includes a plurality of augment holes each adapted to mate with an augment provisional.  
   
   
       19 . The trialing assembly of  claim 8  wherein one of said trialing plate and said broaching plate includes at least one alignment rail, said at least one alignment rail engaging the other of said trialing plate and said broaching plate to restrict movement of said trialing plate relative said broaching plate along a plane of said top surface.  
   
   
       20 . A trialing assembly for trialing an articular surface provisional, the trialing assembly comprising: 
 a broaching plate having a bottom surface adapted for placement atop the resected tibia and an opposite top surface; and    a trialing plate removably disposed atop said broaching plate and overlying substantially all of said top surface, said trialing plate having an inferior surface adapted for placement atop said top surface and an opposite superior surface, said trialing plate including an engagement member extending superiorly from said superior surface, said engagement member adapted to engage with said surface provisional, 
 wherein one of said broaching plate and said trialing plate including at least one peg opening, the other of said broaching plate and said trialing plate includes at least one peg extending therefrom, said at least one peg received within said at least one peg opening.