🦴 Chapter 742 · Osteogenesis Imperfecta (OI)

Nelson Textbook of Pediatrics 22nd Edition | Osteogenesis imperfecta (brittle bone disease): genetic disorder of type I collagen (COL1A1/COL1A2) → bone fragility, fractures. Sillence classification: Type I (mild, blue sclerae), Type II (perinatal lethal), Type III (severe, progressive deforming, white sclerae), Type IV (moderate, white sclerae). Recessive types: VII, VIII, IX (CRTAP, LEPRE1, PPIB). Treatment: bisphosphonates (pamidronate), physical therapy, intramedullary rodding surgery, hearing aids.

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📋 30 Clinical Scenarios — Osteogenesis Imperfecta

📇 High‑Yield Review Cards

🩺 Clinical Recognition: Osteogenesis Imperfecta

Select a presentation to review diagnostic clues and management per Nelson Ch 742.

📋 Stepwise Management of Osteogenesis Imperfecta

🔑 Key Principles — Nelson Chapter 742
• Type I (mild): COL1A1 null allele (↓ normal collagen). Blue sclerae, fractures (childhood, decrease after puberty), presenile hearing loss, dentinogenesis imperfecta (type IB). Autosomal dominant.
• Type II (perinatal lethal): Most severe. Multiple intrauterine fractures, crumpled femurs, beaded ribs, small thorax. Stillborn or die shortly after birth.
• Type III (progressive deforming): Severe, fractures at birth, progressive deformity, short stature, triangular facies, white sclerae, dentinogenesis imperfecta. Wheelchair-dependent.
• Type IV (moderate): Variable severity, white sclerae, fractures, moderate short stature.
• Recessive types (VII, VIII, IX): CRTAP, LEPRE1 (P3H1), PPIB. Severe to lethal. White sclerae.
• Treatment: Bisphosphonates (IV pamidronate) increase bone density, reduce fractures. Physical therapy, intramedullary rodding for long bone deformities. Hearing aids for conductive hearing loss.

    ⚡ Reflex Prompts — Clinical Decisions

    📖 Summary: Osteogenesis Imperfecta (Nelson 742)