To review factors associated with development of osteoporosis in patients with rheumatic diseases, as well as the preventive and therapeutic measures.
A MEDLINE literature search.
1 Pathogenesis. Rheumatoid arthritis in itself causes reduction of bone mass; this process can be aggravated by glucocorticoid treatment. With glucocorticoid treatment, bone mineral density decrease is most pronounced during the first months of treatment. There is no agreement on the effects of daily dose, cumulative dose, and duration of glucocorticoid treatment on the rate of bone loss. However, with treatment by low doses (< 10 mg of prednisone equivalent per day), bone loss appears to be minimal or even undetectable compared to controls. Alternate day treatment, or treatment with steroid 'pulses' have not been shown to protect from bone loss. 2 Prevention and treatment. Prophylactic and therapeutic measures for glucocorticoid-induced osteoporosis include calcium supplementation, vitamin D in physiological doses and oestrogen in perimenopausal female patients. Efficacy has not always been shown in this particular indication but is extrapolated from other forms of osteoporosis. Limited data exist on treatment with anabolic steroids, calcitonin (with an additional analgesic effect) and biphosphonates and reduction of fracture rates has not yet been investigated. At present, there is insufficient evidence to show that altered steroid molecules can dissociate adverse effects on bone from clinically desirable effects.
In view of the paucity of study data, prophylaxis and therapy of glucocorticoid-induced osteoporosis should receive more attention in future clinical studies.