Osteopetrosis vs. Paget’s Disease: NEET PG Comparison
Metabolic Bone Diseases: Skeletal Remodeling Disorders
1. Comparative Overview
| Feature | Osteopetrosis (Marble Bone) | Paget’s Disease (Osteitis Deformans) |
|---|---|---|
| Pathology | Defective osteoclasts; failure of bone resorption. | Increased, disorganized bone remodeling (osteoclast/osteoblast). |
| Key Finding | “Bone-in-bone” appearance; “Sandwich vertebrae.” | “Cotton-wool” skull; “Picture-frame” vertebrae. |
| Biochem | Usually normal (may have hypocalcemia). | High ALP; Normal Ca/P. |
2. High-Yield NEET Pearls
- Osteopetrosis: Despite the increased bone density, these bones are brittle and fracture easily. Compression of cranial nerves leads to blindness and deafness.
- Paget’s Disease Phases: Lytic → Mixed → Sclerotic.
- Paget’s Risk: Increased risk of developing Osteosarcoma (the most dreaded complication).
- Clinical Signs in Paget’s: Enlarging head size (needs a larger hat), bone pain, bowed limbs, and high-output heart failure (due to increased vascularity of bone).
- Treatment: Bisphosphonates are the treatment of choice for symptomatic Paget’s disease.