Evaluation of serum vitamin D levels and their impact on functional outcomes among patients undergoing total knee arthroplasty

Vitamin D deficiency is common among patients undergoing total knee arthroplasty (TKA) and may adversely affect postoperative recovery. This prospective study of 120 patients evaluated the association between preoperative serum vitamin D levels and functional outcomes using KSS and WOMAC scores. Patients with sufficient vitamin D (≥30 ng/mL) showed significantly better KSS (85.2 ± 6.3) and lower WOMAC (18.3 ± 5.2) scores at 6 months compared to deficient individuals (p < 0.001). Vitamin D deficiency remained an independent predictor of poorer recovery after adjustment for confounders. Preoperative correction of vitamin D deficiency may improve functional outcomes following TKA.