Steroid-induced osteoporosis
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Through Calcium
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
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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.
In addition to the detection of abnormal BMD, the diagnosis of osteoporosis requires investigations into potentially modifiable underlying causes; this may be done with blood tests. Depending on the likelihood of an underlying problem, investigations for cancer with metastasis to the bone, multiple myeloma, Cushing's disease and other above-mentioned causes may be performed.
Prevention and Treatment
To prevent steroid-induced osteoporosis, the steroid dose and duration should be as low and as short as possible. All patients on long term glucocorticoids (≥3 months) should be encouraged to do weightbearing exercise, avoid smoking and excess alcohol and take fall prevention measures. Daily calcium and vitamin d intake should be sufficient. DXA scans can be used in combination with the FRAX tool to assess the risk of future fractures for decisions on pharmacological treatment. Importantly, FRAX does not take into account the dose and duration of glucocorticoid.
The International Osteoporosis Foundation and the European Calcified Tissue Society recommend pharmacological therapy for osteoporosis in postmenopausal women and men ≥70 years, with a previous fragility fracture, or a dose equivalent of prednisone ≥7.5 mg daily for ≥3 months. For premenopausal women and men <50 years taking steroids for ≥3 months, osteoporosis therapy should be considered for those with a history of a fragility fracture. For all others, treatment decisions are individualized based upon patient characteristics and clinical judgement.
References