This study aimed to investigate the relationship between sarcopenia and change in bone mineral density (BMD) and functional outcome in hip arthroplasty patients. Among the 221 patients who had undergone hip arthroplasty, 147 patients were enrolled. All patients were divided into 2 groups according to presence of sarcopenia. Bone mineral density (BMD) at hospitalization and 1-year after surgery and Barthel index was measured at the time of before injury, hospitalization, 3 months and 1-year after surgery. BMD at hospitalization showed .627 ± .082 (g/cm2) in Sarcopenia and .726 ± .059 (g/cm2) in Non-sarcopenia at femur (total) site ( < .001), .531 ± .085 (g/cm2) vs .629 ± .057 (g/cm2) at femur neck site (P=.002), .715 ± .084 (g/cm2) vs .807 ± .058 (g/cm2) at lumbar (L1-L4) site ( < .001). BMD at 1-year follow-up period, Sarcopenia showed .626 ± .082 (g/cm2) and Non-sarcopenia showed .725 ± .060 (g/cm2) at femur (total) site ( < .001), .530 ± .085 (g/cm2) vs .629 ± .058 (g/cm2) at femur neck site ( < .001), .715 ± .084 (g/cm2) vs .806 ± .058 (g/cm2) at lumbar (L1-L4) site ( < .001). Change of BMD showed -.01 ± .25% for Sarcopenia and -.15 ± .47% for Non-sarcopenia in femur (total) site (P=.089), -.08 ± .63% vs -.01 ± 1.01% in femur neck site ( = .058), .00 ± .09% vs -.12 ± .33% for each group in lumbar (L1-L4) site ( = .052). Barthel index score showed 79.94 ± 5.66 for Sarcopenia and 84.74 ± 5.36 for Non-sarcopenia at pre-injury status ( < .001), 33.89 ± 4.94 vs 33.87 ± 5.36 at the time of hospitalization ( = .977), 57.42 ± 7.19 vs 60.06 ± 5.39 at 3 months follow up ( = .015), 73.86 ± 5.94 vs 80.71 ± 4.81 for each group at 1-year follow up ( < .001). Our study found that the sarcopenia showed lower BMD than the non-sarcopenia, but there was no significant difference of BMD change in the follow-up period. In addition, the sarcopenia showed poor functional results at all points except at the time of hospitalization.
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