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The Journal of Bone and Joint Surgery
T here are several techniques for the accurate measurement of the migration of components after arthroplasty some of which require the operative placement of tantalum balls. We have reviewed the position and migration of these markers in 64 patients after total hip arthroplasty. In 40% of cases, one or more balls was seen to be outside the proximal femur on the postoperative radiograph, although all were considered to be within the bone at operation. In two hips, one ball appeared to havedoi:10.1302/0301-620x.80b3.8463 pmid:9619928 fatcat:cga37nzszjdtda6s26k6qy5x2i