Anatomically relieved augments

Abstract

Anatomically shaped augments that are configured for implantation in a bone and which have one or more reliefs. A distal end of an outer portion of the augment can have a shape that is configured to generally conform to the shape of a metaphyseal-diaphyseal junction of an intramedullary canal of a bone. A proximal end of the outer portion can have a shape that is configured to generally conform to a shape of the metaphyseal region of the intramedullary canal. The reliefs can be configured to reduce a size of the augment and enhance the degree of freedom in the implant positioning and/or sizing of the augment. Further, such reliefs may contour the augment so as to prevent cortical bone contact and/or prevent contact with the implant device that may be associated with misalignment between an intramedullary canal and metaphyseal or diaphyseal regions of the bone.

1 . An augment for implantation in association with an orthopedic implant device in a bone, the augment comprising:
 an augment wall having an outer portion, an inner portion, a distal end, and a proximal end, the inner portion defining an inner region of the augment, the inner region sized to receive placement of one or more components of the orthopedic implant device, the distal end of the augment wall having a first shape configured to generally conform to the shape of a metaphyseal-diaphyseal junction of a canal of the bone, the proximal end at the outer portion having a second shape configured to generally conform to a shape of the metaphyseal region of the canal of the bone, the first shape having a different shape and size than the second shape; and   at least one relief positioned about at least one of the proximal and distal ends of the augment wall, at least one of the reliefs being adapted to prevent, when the augment is implanted in the bone, point contact between a portion of the augment wall and an adjacent wall of the bone.   
     
     
         2 . The augment of  claim 1 , wherein at least one of the at least one relief is shaped to at least assist with the first shape being configured to generally conform to the shape of the metaphyseal-diaphyseal junction. 
     
     
         3 . The augment of  claim 1 , wherein the at least one relief is shaped to at least assist with the second shape being configured to generally conform to the shape of the metaphyseal region of the canal of the bone. 
     
     
         4 . The augment of  claim 1 , wherein the at least one relief is shaped to at least assist, when the augment is implanted in the bone, in the portion of the augment wall adjacent to the relief from contacting a cortical bone portion of the bone. 
     
     
         5 . The augment of  claim 1 , wherein the at least one relief is shaped to facilitate selective rotational displacement of the augment relative to at least the bone during implantation of the augment in the bone. 
     
     
         6 . The augment of  claim 5 , wherein the at least one relief is shaped to avoid contact between the augment and the orthopedic implant device during implantation when an intramedullary canal of the bone is misaligned with the metaphyseal-diaphyseal junction of the bone. 
     
     
         7 . The augment of  claim 5 , wherein at least one relief is shaped to avoid contact between the augment and the orthopedic implant device during implantation when an intramedullary canal of the bone is misaligned with the metaphyseal region of the bone. 
     
     
         8 . The augment of  claim 1 , wherein the at least one relief includes an aperture and a relief wall, the aperture extending through the augment wall to the inner portion of the augment wall. 
     
     
         9 . The augment of  claim 8 , wherein the aperture extends along a central relief axis that is generally parallel to an adjacent portion of the augment wall. 
     
     
         10 . The augment of  claim 9 , wherein the central relief axis is non-perpendicular to a central augment axis of the augment. 
     
     
         11 . The augment of  claim 8 , wherein a distance between the relief wall and an opposing portion of the inner portion is less than a distance between an adjacent portion of the outer portion and the inner portion. 
     
     
         12 . The augment of  claim 1 , wherein the at least one relief includes a relief wall, a distance between the relief wall and an opposing portion of the inner portion is less than a distance between an adjacent portion of the outer portion and the inner portion, and wherein the relief does not include an aperture. 
     
     
         13 . The augment of  claim 12 , wherein the relief wall extends along a central relief axis that is non-perpendicular to a central augment axis of the augment, the central relief axis being generally parallel to a portion of the augment wall that is adjacent to the relief wall. 
     
     
         14 . The augment of  claim 8 , wherein the relief wall is inwardly tapered toward at least one of the proximal end and the distal end of the augment wall to reduce a profile size of the augment. 
     
     
         15 . The augment of  claim 1 , wherein the at least one relief includes a first relief and a second relief, the first and second reliefs being on opposite sides of the augment wall, and wherein the first relief extends to the distal end of the augment wall and the second relief extends to the proximal end of the augment wall. 
     
     
         16 . The augment of  claim 15 , wherein the first relief terminates in relatively close proximity to the proximal end, and the second relief terminates in relatively close proximity to the distal end. 
     
     
         17 . The augment of  claim 15 , wherein the first and second reliefs reduce the size of the augment wall along at least opposite ends of the augment. 
     
     
         18 . The augment of  claim 1 , wherein at least one of the at least one relief terminates at a mid-section of the augment wall. 
     
     
         19 . The augment of  claim 1 , wherein the augment is a tibial augment. 
     
     
         20 . The augment of  claim 1 , wherein the augment is a femoral augment.