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Bone mineral density (BMD) around the stem of OMNIFLEX® was measured 2-4 times (mean 2.9 times) during 15 months after surgery with Lunar DPX in 16 hips of 14 patients (OA, RA or ANF). Percent BMD changes per month were calculated in 7 regions according to Gruen's classification. Bone mineral density reduced most markedly during the first 6 months after surgery in every region, and than stabilized or increased in later periods. During the first 6 months, region 7 (Calcar region) showed the most marked BMD reduction when compared to other regions. BMD was stabilized or increased in at least 50 % of patients the earliest (3-9 months) in region 1 and 2, 6-12 months in region 3, 9-15 months in region 4 and 7, while BMD kept reducing in region 5 and 6 throughout all postoperative periods. This finding suggests that BMD stabilized or increased earlier on the lateral rather than medial side of the stem.

Evaluation of Postoperative Bone Mineral Density Changes around the Stem of Bipolar Hip Prosthesis.