Which post-menopausal metabolic bone disease is characterized by a significant decrease in bone mineral density and increased susceptibility to fractures due to declining estrogen levels?

Answer and explanation

Correct answer: C. Osteoporosis

  1. Step 1: Bone remodeling involves continuous resorption by osteoclasts and synthesis by osteoblasts.
  2. Step 2: Estrogen maintains bone mass by promoting osteoclast apoptosis and stimulating osteoblasts.
  3. Step 3: Following menopause, estrogen levels decline precipitously, shifting the balance toward excessive osteoclastic bone resorption.
  4. Step 4: This causes thinning of cortical bone and porous trabeculae (decreased bone mass), defining osteoporosis and dramatically elevating the risk of hip, wrist, and vertebral compression fractures.
Answer
Osteoporosis
Why not the others: 'Gouty arthritis' is caused by the deposition of monosodium urate crystals in joint synovial fluid; 'Osteopetrosis' is a rare genetic disorder characterized by overly dense, sclerotic bones due to defective osteoclasts; 'Paget's disease' causes disorganized, deformed bone remodeling with localized bone enlargement.

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