Objective: To examine whether vitamin D deficiency is a determinant risk factor of chronic low back pain
(LBP) in Moroccan postmenopausal women.
Methods: A biochemical assay of serum calcium, phosphate, 25(OH)D, and parathormone (PTH) was performed for 105
patients complaining from a chronic LBP with no obvious causes and compared to those of 45 healthy patients. All participants
were postmenopausal. Patients were matched with controls for age and body mass index (BMI). Vitamin D deficiency
was defined as a circulating level of 25(OH)D below 20 ng/ml.
Results: Vitamin D deficiency was significantly more common in patients suffering from chronic LBP than in controls (79
% vs 61.4 %; P= 0.02). Falls antecedent was also associated with chronic LBP (37.1 % in patients vs 20.5% in controls;
P< 0.01). There was no significant association between chronic LBP and age, BMI, smoking status, nor with number of
pregnancies. In multiple logistic regression, after adjusting for potential confounders factors potentially influencing
chronic LBP (age, BMI, smoking status, number of pregnancies), the main determinants of chronic LBP were vitamin D
deficiency [OR 2.5 (95% IC, 1.1-5.8; P = 0.04)] and falls antecedent [OR 3 (95% IC, 1.2-7.2; P = 0.01)].
Conclusion: Our study shows a significant association between vitamin D deficiency and chronic LBP in Moroccan postmenopausal
women. Further studies are clearly warranted to determine the effectiveness and the mechanism(s) of this
links between vitamin D deficiency and chronic LBP.