Long bone resurfacing bone lock

Abstract

A locking implant is provided for a long bone. The locking implant comprises a head portion, a stem portion extending from the head portion, and an anchor disposed at an end of the stem portion for engagement within a resected long bone. The anchor defines at least one locking feature, such as a cam, configured to engage an interior of the resected long bone upon rotation of the implant, thereby locking the head portion to the long bone. The implant may comprise a two component modular design. Methods of locking the implant to a long bone structure are also provided.

1 . (canceled) 
     
     
         2 . An implant for a long bone, the implant comprising:
 a head;   a stem extending from the head; and   a locking feature disposed at an end of the stern,the locking feature radially extending from the stem in a first radial direction, wherein the locking feature engages an interior of a resected long bone upon rotation of the implant to couple the head to the resected long bone.   
     
     
         3 . The implant of  claim 2 , wherein the locking feature comprises a first locking feature, and the implant further comprises a second locking feature extending in a second radial direction opposite the first radial direction. 
     
     
         4 . The implant of  claim 2 , wherein the locking feature comprises a plurality of locking features extending radially from the stem. 
     
     
         5 . The implant of  claim 4 , wherein the plurality of locking features are equally spaced about the stem. 
     
     
         6 . The implant of  claim 2 , wherein the locking feature defines a cam surface and, upon rotation of the implant, the cam surface engages the interior of the resected long hone. 
     
     
         7 . The implant of  claim 6 , wherein the cam surface comprises teeth. 
     
     
         8 . The implant of  claim 2 , wherein the locking feature defines a wedge surface and, upon rotation of the implant, the wedge surface engages the interior of the resected long bone. 
     
     
         9 . The implant of  claim 2 , wherein the locking feature comprises at least one of an extending pin, curved hook, sharpened edge, protrusion, blade, nail, and annular flange. 
     
     
         10 . The implant of  claim 2 , wherein the head defines an upper articulating surface and a substantially planar lower surface, and the stem orthogonally extends from the substantially planar lower surface. 
     
     
         11 . The implant of  claim 2 , wherein at least one of the stem and the locking feature comprises a porous metal or porous metal coating. 
     
     
         12 . The implant of  claim 2 , wherein the implant comprises at least one of titanium, a titanium alloy, stainless steel, cobalt-chrome, cobalt-chrome alloy, ceramic, polymer, and combinations thereof. 
     
     
         13 . An assembly comprising:
 a head defining at least one retaining feature;   a base comprising a first end including a first anchor for engaging an interior of a resected long bone and an opposing second end including a second anchor for coupling with the at least one retaining feature of the head, the first anchor comprising a stem and a locking feature disposed at an end of the stern, the locking feature radially extending from the stem in a first radial direction, wherein the locking feature engages an interior of a resected long bone upon rotation of the assembly to couple the assembly to the resected long bone.   
     
     
         14 . The assembly of  claim 13 , wherein the locking feature comprises a first locking feature, and the implant further comprises a second locking feature extending in a second radial direction opposite the first radial direction. 
     
     
         15 . The assembly of  claim 13 , wherein the locking feature comprises a plurality of locking features extending radially from the stern. 
     
     
         16 . The assembly of  claim 15 , wherein the plurality of locking features are equally spaced about the stem, 
     
     
         17 . The assembly of  claim 13 , wherein the locking feature defines a cam surface and, upon rotation of the implant, the cam surface engages the interior of the resected bone. 
     
     
         18 . The assembly of  claim 13 , wherein the second anchor comprises an extending rail or dovetail-shaped flange. 
     
     
         19 . The assembly of  claim 13 , further comprising at least one mechanical fastener for removably coupling the base to the head. 
     
     
         20 . The assembly of  claim 13 , wherein the base comprises an annular collar disposed between the first and second anchors. 
     
     
         21 . An implant for a long bone, the implant comprising:
 a head;   a stem extending from the head; and   a plurality of locking features disposed at an end of the stem, each of the plurality of locking features radially extending from the stem in a unique radial direction, wherein each of the plurality of locking features engage an interior of a resected long bone upon rotation of the implant to couple the head to the resected long bone.