Sim DS, Tay K, Howe TS, et al. - Whether there exists a link between vitamin D concentrations and recovery from hip surgery, was inquired via this study. Participants were patients who had hip fracture surgery from January 2012 to December 2016 and had vitamin D levels evaluated during admission. They were categorized based on four different vitamin D concentrations—severe vitamin D deficiency (≤10 ng/mL), mild deficiency (10-20 ng/ml), insufficiency (20-30 ng/ml), and normal (>30ng/ml). Presence of severe vitamin D deficiency and mild deficiency was detected in 9% and 39%, respectively, out of 664 patients identified. Multivariate analysis revealed lower 6-month Parker Mobility Score and 36-Item Short Form Health Survey Physical Functioning in relation to severe vitamin D deficiency. Findings demonstrated that an independent risk for poorer recovery of function as well as quality of life post-hip fracture surgery was conferred by preoperative severe vitamin D deficiency.