Hip resurfacing arthroplasty complicated by mismatched implant components

Figure 1 The post-operative X-ray, showed a mismatch between the femoral and the acetabular component diameters.

Figure 2 Coordinate measuring machines wear measurement of the mismatched couple showed that the femoral component had already been damaged.

Figure 3 The 62-mm cup mismatched with and 56-mm head and but correctly matched with a 54-mm head. A: Mismatched couple with 62-mm cup and 56-mm head. Note how the femoral head was not fully seated in the socket by 3 to 4 mm. Compared to B; B: The same 62-mm thick shell cup correctly matched with a 54-mm head.