Comparison of the possible risk factors of bone mineral density in subjects with ulcerative colitis and healthy subjects.

OBJECTIVE

Inflammatory bowel disease (IBD) is a gastrointestinal system disorder with a variety of causes. The prevalence of reduced bone mineral density (BMD) is greater in people with IBD as compared with healthy individuals. In this study, we aimed to investigate the possible risk factors for low BMD in subjects with ulcerative colitis (UC) and in healthy control subjects.

SUBJECTS AND METHODS

A total of 40 subjects with UC and 29 healthy subjects were enrolled in the study. Age; sex; body mass index; location and duration of disease; current corticosteroid, azathioprine, or other immunosuppressive medications; smoking; consumption of alcohol, milk, and milk products; menstrual pattern in women; and use of vitamin D, calcium, folic acid, multivitamins, and iron preparations were recorded. BMD was measured by dual-energy x-ray absorptiometry at L2-L4 of the spine and the femoral neck.

RESULTS

The BMD of patients was found to be lower than that in the control group. The T and z scores of the lumbar vertebra and femoral neck were normal in 21 subjects (52.5%). A total of 17 (42.5%) subjects had osteopenia, and 2 (5%) subjects had osteoporosis. Parathyroid hormone, 1,25(OH)2 vitamin D3, osteocalcin, and urinary markers were found to be similar in both groups. There were no significant differences between subjects with UC and subjects in the control group according to age, sex, and conventional risk factors.

CONCLUSIONS

The BMD of subjects with UC was found to be lower than that in subjects of similar age and sex in the control group. Our findings suggest that that the disease itself is the most important pathogenic factor contributing to low BMD.