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Emergency and Acute Medicine – Osteoporosis
Osteoporosis is characterized by a diffuse decrease in skeletal mass, with trabecular bone—particularly in the vertebrae and femur—affected earlier and more severely than cortical bone. Although the disease process begins in adolescence, fractures typically do not manifest until age 50 years or older. Females are affected far more commonly than males, especially following menopause.
The underlying mechanism is an imbalance between bone resorption and bone formation, with resorption predominating. Advanced age is the most significant risk factor. Additional contributors include inadequate dietary calcium intake, particularly early in life, a sedentary lifestyle with lack of weight-bearing activity, and estrogen deficiency after menopause. Other important risk factors include long-term corticosteroid use, alcoholism, methotrexate therapy, tobacco use, low body weight, and familial predisposition. Pediatric patients are generally asymptomatic despite early onset of bone loss.
Osteoporosis is usually clinically silent until pathologic fractures occur. Fractures resulting from minimal trauma or recurrent fractures are hallmark features. The vertebral column is most commonly involved, with multiple compression fractures often leading to kyphosis and scoliosis. Hip fractures, including femoral neck and intertrochanteric fractures, are also frequent. A history of fractures after low-energy mechanisms or a family history of osteoporosis should raise suspicion. Physical examination findings typically relate to the acute fracture rather than the underlying disease itself.
Evaluation focuses on identifying fractures without significant mechanisms and assessing risk factors. A careful neurovascular examination distal to femoral or other extremity fractures is essential. In patients with vertebral fractures, rectal tone and postvoid residual should be assessed. Plain radiographs of suspected fractures may show osteopenia, though this is a late finding. Spine films may reveal old compression fractures. Computed tomography is recommended for vertebral fractures to assess for retropulsion and spinal canal compromise, which may not be evident on plain films.
Laboratory studies such as serum calcium, parathyroid hormone, and alkaline phosphatase can help differentiate osteoporosis from other metabolic bone disorders. Imaging with plain radiographs identifies fractures, but determining fracture age can be difficult. Bone scan or CT may help clarify fracture chronicity, particularly in the spine. Bone densitometry using dual-energy x-ray absorptiometry confirms the diagnosis, with a bone mineral density T-score of −2.5 or lower defining osteoporosis.
The differential diagnosis includes multiple myeloma or metastatic malignancy, osteogenesis imperfecta, hyperparathyroidism, and other demineralizing bone diseases. Management in the emergency setting prioritizes fracture care. Prehospital providers should minimize patient movement and report mechanism details suggestive of pathologic fracture. Initial treatment involves immobilization and standard fracture management, recognizing that healing may be delayed or incomplete. Orthotic back braces may be needed for vertebral fractures in consultation with orthopedics. Prevention remains more effective than acute treatment, and long-term therapy should be initiated or reinforced.
Pharmacologic therapy includes bisphosphonates such as alendronate or risedronate as first-line agents, with alternatives including zoledronic acid, raloxifene, denosumab, calcitonin, parathyroid hormone analogs, and, in selected cases, estrogen therapy. Adequate calcium and vitamin D supplementation are essential. Admission decisions follow standard orthopedic protocols, with particular attention to age, mobility, neurologic symptoms, and social factors. Compression fractures are often stable, but cervical fractures or those with neurologic deficits require admission and emergent specialty consultation.
Key points include recognizing recurrent or low-energy fractures as suggestive of osteoporosis, understanding that osteopenia on plain radiographs is a late but important clue, and initiating referral for definitive evaluation and treatment. Bisphosphonates remain first-line therapy for long-term management, and coordinated follow-up is critical to prevent future fractures.
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