MMSRSMultimedia Storage and Retrieval System
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The patients with 36-mm metal-metal bearing THA had essentially the same height (68.2 inches), weight (181 pounds), and BMI (27.2 kg/m2) as the patients with an MMSR and were significantly taller (p < 0.0001), leaner (p < 0.0001), and had a higher preoperative UCLA activity score (4.8 vs 2.9; p < 0.0001) than the other patients undergoing THA, with no significant differences in age, diagnoses, or Charnley class.
The postoperative outcome of patients with a 36-mm metal-metal bearing THA was similar to the MMSR group and significantly better than the other patients undergoing THA, with a higher average Harris hip score (99 vs 94; p = 0.05), higher average function score (p = 0.05), higher average SF-12 physical score (563 vs 42; p < 0.0001), higher average SF-12 mental score (57 vs 50; p = 0.007), and a higher average UCLA activity score (7.7 vs 4.9; p < 0.0001).
We hypothesized that the functional benefits of MMSR are due, at least in part, to patient-related variables, such as age and general health status.