The Association of Vitamin D Status and Pre-operative Physical Activity in Patients with Hip or Knee Osteoarthritis
Elizabeth A Jacob
Livnat Blum
Hany S Bedair
Andrew A Freiberg
Sadeq A Quraishi


Joint replacement
Physical activity
Vitamin D


Background: Vitamin D is important for musculoskeletal health and may have significant implications for maintaining physical activity in elderly patients. Our goal was to investigate whether serum 25-hydroxyvitamin D (25OHD) levels are associated with pre-operative physical activity in patients who are offered elective knee or hip joint replacement surgery.

Methods: We performed a single-center, retrospective analysis of patients who had elective knee or hip replacement surgery from 2002 to 2012. To investigate the association of serum 25OHD levels with pre-operative physical activity, as assessed by the University of California, Los Angeles (UCLA) activity scale, we performed a multivariable logistic regression analysis while controlling for age, sex, race, body mass index, American Society of Anesthesiologists physical status score, and season.

Results: We identified 182 patients who met inclusion criteria. Mean (± standard deviation) 25OHD level and UCLA activity scale score were 29±13 ng/mL and 4±2, respectively. Patients with 25OHD levels <20 ng/mL were almost three times more likely to have UCLA activity scale scores ≤3 [adjusted odds ratio 2.78; 95% confidence interval 1.72–9.17]. Further adjusting for “type of 25OHD assay” or “type of joint surgery” did not materially change this result.

Conclusion: In our cohort of knee or hip joint replacement surgery patients, 25OHD levels were associated with pre-operative physical activity scores. Prospective, randomized, clinical trials are needed to verify whether optimizing pre-operative vitamin D status may improve physical activity and influence clinical decision-making in knee or hip joint replacement surgery candidates.



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