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Purpose We investigated and compared the serum 25-OH vitamin D [25(OH)D] level and prevalence of vitamin D deficiency (VDD) between patients who underwent total knee arthroplasty (TKA) and healthy participants through a matched analysis. Methods The unmatched case group consisted of 824 patients who underwent TKA and the unmatched control group 2,794 healthy participants examined at our institution. The control group was matched on the various characteristics—sex, age, weight, body mass index (BMI), blood chemistry, and season of sampling—through propensity score matching (PSM). After PSM, 501 and 721 patients were matched in the case and control group, respectively. Levels of blood chemistry including 25(OH)D were examined and VDD was defined as Results The average serum 25(OH)D level was significantly lower in the OA group (15.3 ng/mL) than that in the control group (19.9 ng/mL, p Conclusions The patients who underwent TKA had lower serum 25(OH)D level and higher VDD prevalence compared to the healthy participants who matched using PSM. There were no differences in VDD rates by sex or obesity and the VDD prevalence was more than 70% during all season. Therefore, in patients undergoing TKA, general attention to VDD is required regardless of sex, obesity, and season. Summary Serum 25-OH vitamin D [25(OH)D] level and vitamin D deficiency (VDD) prevalence were compared between patients undergoing total knee arthroplasty and healthy individuals. The differences in serum 25(OH)D level and VDD prevalence were significant between the two groups after propensity score matching

Purpose: The purpose of this study was to compare the general characteristics that affect the prognosis and evaluate the influence of stroke on one-year postoperative mortality and recovery of ambulatory status in elderly patients over 65 years old with femoral intertrochanteric fracture. Materials and Methods: This study included 80 patients who were followed-up for one year after proximal femoral nailing for femur intertrochanteric fracture between January 2008 and December 2013. We analyzed the relationship among the one-year postoperative mortality, recovery of ambulatory status and the associated factors (age, gender, associated underlying disease, American Society of Anesthesiologists [ASA] grade, comminution of the fracture, dementia). Results: The one-year postoperative mortality rate in all patients and patients with stroke was 28.8% and 42.9%, respectively. The oneyear postoperative mortality rate was significantly higher in patients with stroke, high ASA grade, and unstable fracture. Decrease of the one-year postoperative ambulatory status was 50.9% in all patients and was significantly associated with grade III or IV ASA rating. No significant relationships were observed between the one-year postoperative recovery of ambulatory status and stroke. Conclusion: Stroke, ASA grade, and unstable fracture were prognostic factors associated with one-year postoperative mortality following intertrochanteric fracture. ASA rating was the only prognostic factor affecting one-year postoperative recovery of ambulatory status.