Steroid-induced osteoporosis
Human disease
Steroid-induced osteoporosis is osteoporosis arising from the use of glucocorticoids (a class of steroid hormones) analogous to Cushing's syndrome but involving mainly the axial skeleton. The synthetic glucocorticoid prescription drug prednisone is a main candidate after prolonged intake. Bisphosphonates are beneficial in reducing the risk of vertebral fractures. Some professional guidelines recommend prophylactic calcium and vitamin D supplementation in patients who take the equivalent of more than 30 mg hydrocortisone (7.5 mg of prednisolone), especially when this is in excess of three months. The use of thiazide diuretics, and gonadal hormone replacement has also been recommended, with the use of calcitonin, bisphosphonates, sodium fluoride or anabolic steroids also suggested in refractory cases. Alternate day use may not prevent this complication.
It is also known as glucocorticoid-induced osteoporosis.
Mechanism
Mechanisms of SIOP include:
Direct inhibition of osteoblast function
Direct enhancement of bone resorption
Inhibition of gastrointestinal calcium absorption
Increased urine calcium loss
Inhibition of sex steroids
Diagnosis
The diagnosis of osteoporosis can be made using conventional radiography and by measuring the bone mineral density (BMD). The most popular method of measuring BMD is Dual-energy X-ray absorptiometry. A clinical diagnosis of SIOP can be made following a fragility fracture in a patient taking steroids.
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