Osteopenia

Disease Description (Causes and Symptoms)

• Definition: Osteopenia is a condition in which the T-value of bone mineral density compared with the average of young adults is less than -1.0 and greater than -2.5 (i.e., T-score between -1.0 and -2.5), corresponding to the stage preceding osteoporosis.
• Causes / pathophysiology:
  • The main causes are low peak bone mass formation (insufficient formation during youth), aging, and bone loss due to menopause.
  • Other risk factors include genetics, low body weight, excessive alcohol consumption and smoking, long-term use (e.g., 3 months or more) of systemic steroids or anticonvulsants, vitamin D deficiency and insufficient calcium intake, malabsorption (e.g., gastrointestinal surgery or intestinal disease), uncontrolled hyperthyroidism, and rheumatic diseases.
  • Pathophysiologically, bone resorption is relatively greater than bone formation, resulting in decreased bone mass and weakened bone structure.
• Main symptoms:
  • Usually asymptomatic (early detection is difficult because there are no symptoms).
  • If a fracture occurs (especially a vertebral compression fracture, hip fracture, or wrist fracture), symptoms may include pain, physical deformity (kyphosis), and activity limitations.

Treatment Methods

• Diagnosis and risk assessment:
  • Check the T-score through a bone mineral density test (DEXA).
  • Assess the need for pharmacological treatment by also calculating the 10-year fracture risk (e.g., FRAX).
• Non-pharmacological treatment (basic):
  • Calcium intake: Generally 1,000–1,200 mg per day for adults (obtain primarily through food and use supplements if necessary).
  • Vitamin D: Take supplements along with sun exposure (general recommended amount: 800–1,000 IU/day; adjust according to the blood 25-OH vitamin D level; the target clinical standard is 25(OH)D ≥20–30 ng/mL).
  • Regular exercise: Weight-bearing exercise (walking, jogging, hiking) and strength training are recommended at least 3 times per week. Include balance and fall-prevention exercises.
  • Lifestyle: Stop smoking, limit alcohol, restrict excessive caffeine, and reduce the risk of falls (such as by improving the home environment).
• Pharmacological treatment (considered when fracture risk is high or bone mineral density worsens):
  • Bone resorption inhibitors (generally first-line treatment): Bisphosphonates (such as alendronate, risedronate, and zoledronic acid). Dental examination is recommended before use (osteonecrosis of the jaw occurs rarely). Side effects include gastrointestinal problems and, rarely, atypical femoral fractures and osteonecrosis of the jaw.
  • Selective estrogen receptor modulators (SERMs, e.g., raloxifene): Selective indications (postmenopausal women, with consideration of breast cancer risk). May increase the risk of thromboembolism.
  • Hormone therapy (menopausal women): Consider short-term use after considering symptoms and risks (including cardiovascular, breast cancer, and thrombotic risks).
  • Other treatments (primarily indicated for osteoporosis): Denosumab, teriparatide, and others may be considered for high-risk groups, but in osteopenia they are generally limited to cases with particularly high risk or those that do not respond to medication.
• Management of underlying causes:
  • Correct hyperthyroidism, malabsorption, and medication-induced causes (such as steroids).
• Monitoring:
  • Regular follow-up bone mineral density testing (generally at intervals of 1–2 years or 2–4 years, depending on risk level and whether treatment is being given).
  • Blood calcium, kidney function, and 25-OH vitamin D testing, as necessary.
• Management of complications:
  • If a fracture occurs, orthopedic treatment and rehabilitation; for vertebral compression fractures, pain management and surgical treatment may be considered (in severe cases).

Checklist Before an Outpatient Visit (Including Items to Bring, Tests, and Sample Questions)

• Items to bring:
  • A list of all medications and supplements currently being taken (especially steroids, anticonvulsants, thyroid medications, etc.)
  • History of previous fractures and bone mineral density test (DEXA) results, if available
  • Menopausal status and age, family history (fractures and osteoporosis), alcohol consumption and smoking status, and physical activity patterns
  • Recent blood test results, if available: calcium, creatinine, 25-OH vitamin D, thyroid function, etc.
• Records to prepare for the outpatient visit:
  • A record of recent changes in height (whether you have become shorter) and whether you have lower back or back pain
• Information about tests:
  • There are no special contraindications or preparations for a DEXA scan (remove metal jewelry). Inform the medical staff in advance if pregnancy is possible.
• Sample questions (items to write down before asking the doctor):
  • "What are my T-score and 10-year fracture risk?"
  • "Is my condition one that requires pharmacological treatment? If so, which medication do you recommend?"
  • "How much calcium and vitamin D should I take?"
  • "What types of exercise should I do, and how often?"

Examples of General Questions to Ask the Doctor

• What are the main benefits and side effects of this medication (the recommended medication)?
• What is my fracture risk (e.g., FRAX score), and do I meet the criteria for pharmacological treatment?
• If I need to take vitamin D or calcium supplements, what should the dosage and duration be?
• When should I have a follow-up bone mineral density test?

Examples of Disease-Specific Questions

• Based on my T-score (e.g., -1.8), do I meet the criteria for starting pharmacological treatment, or would lifestyle improvements and monitoring be sufficient?
• I previously took steroids for a long time. Do you recommend preventive medication for osteopenia (such as bisphosphonates)? If so, when should I start taking it and for how long?

(Note: Treatment decisions are individualized and recommended by the attending physician through a comprehensive assessment of overall clinical risk factors, age, sex, FRAX, and other factors.)