Patent ID: 8100982

Claim:
A modular orthopaedic implant system comprising: a diaphyseal component and a collar component, the diaphyseal component including: a first end having a post; a second end spaced from the post and having a bore co-axial with the post of the first end; a longitudinal axis extending from the first end to the second end, the longitudinal axis extending through the post at the first end and the bore at the second end; a tapered outer surface between the post and the second end, the tapered outer surface having a maximum outer transverse dimension at the junction with the post and a minimum outer transverse dimension at the second end, wherein at least part of the tapered outer surface is porous, and wherein the maximum outer transverse dimension of the tapered surface defines a maximum transverse dimension of the diaphyseal component, the minimum outer transverse dimension of the tapered outer surface and the maximum outer transverse dimensions of the tapered outer surface and the diaphyseal component being perpendicular to the longitudinal axis of the diaphyseal component; the collar component including: a first end having a post; a second end having a bore co-axial with the post of the first end; a longitudinal axis extending from the first end to the second end, the longitudinal axis extending through the post at the first end and the bore at the second end; a substantially cylindrical portion between the first end and second end and surrounding at least a portion of the bore at the second end, the substantially cylindrical portion including an annular surface disposed perpendicular to the longitudinal axis of the collar component at the second end of the collar component, the annular surface having a maximum outer transverse dimension, the substantially cylindrical portion having a maximum outer transverse dimension, the maximum outer transverse dimension of the annular surface being the same as the maximum outer tranverse dimension of the cylindrical portion of the collar and greater than the maximum outer tranverse dimension of the tapered outer surface of the diaphyseal component, the annular surface of the collar having the same maximum outer transverse dimension along two perpendicular axes, the maximum outer transverse dimensions of the substantially cylindrical portion and annular surface being perpendicular to the longitudinal axis of the collar component; wherein the post of the diaphyseal component and the bore of the collar component have complementary sizes and shapes so that the diaphyseal component and the collar component can be assembled and locked together by inserting the post of the diaphyseal component into the bore of the collar component.