Comparison between osteopenia, osteomalacia, and osteoporosis :
| Feature | Osteopenia | Osteomalacia | Osteoporosis |
|---|---|---|---|
| Definition | Low bone mineral density (BMD) below normal but not low enough to be osteoporosis | Defective bone mineralization leading to soft bones | Decreased bone mass and microarchitectural deterioration causing fragile bones |
| Bone Quality | Normal bone composition but reduced quantity | Poor mineralization of bone matrix (osteoid accumulation) | Normal mineralization but reduced bone quantity and structural deterioration |
| Pathophysiology | Imbalance between bone resorption and formation causing bone loss | Vitamin D deficiency or phosphate deficiency → impaired mineralization | Increased bone resorption > formation → porous, brittle bones |
| Common Causes | Aging, early osteoporosis, mild calcium/vitamin D deficiency | Vitamin D deficiency, phosphate deficiency, renal failure, certain drugs | Aging, menopause, glucocorticoids, smoking, alcohol, immobilization |
| Bone Appearance | Reduced density but normal shape and hardness | Soft, weak bones prone to deformities | Fragile, porous bones prone to fractures |
| Clinical Presentation | Usually asymptomatic, increased fracture risk | Bone pain, muscle weakness, fractures, deformities (e.g., bowed legs) | Fragility fractures, height loss, kyphosis |
| Laboratory Findings | Normal calcium, phosphate, vitamin D, alkaline phosphatase | Low vitamin D, low calcium/phosphate, elevated alkaline phosphatase | Usually normal calcium/phosphate/vitamin D; markers of bone turnover may be elevated |
| Radiologic Findings | BMD T-score between -1.0 and -2.5 on DEXA scan | Looser zones (pseudofractures), decreased bone density | BMD T-score ≤ -2.5 on DEXA, cortical thinning, fractures |
| Treatment | Lifestyle, calcium/vitamin D supplementation, monitoring | Correct vitamin D/phosphate deficiency, treat underlying cause | Bisphosphonates, calcium/vitamin D, lifestyle, sometimes anabolic agents |
| Reversibility | Potentially reversible with treatment | Usually reversible if mineralization defect corrected early | Partially reversible; fractures cause permanent damage |