Osteogenesis Imperfecta (OI): Clinical Essentials
Osteogenesis Imperfecta (Brittle Bone Disease) is a genetic disorder of connective tissue caused by a defect in Type I collagen synthesis (most commonly due to mutations in the COL1A1 or COL1A2 genes).
| Feature | Clinical Manifestations |
|---|---|
| Skeletal | Multiple recurrent fractures, often with minimal trauma; bony deformities. |
| Ocular | Blue sclerae (due to choroidal veins showing through thin, translucent sclera). |
| Dental/Auditory | Dentinogenesis imperfecta (discolored, translucent teeth); hearing loss (ossicle malformation). |
High-Yield Clinical Notes:
- Inheritance: Primarily autosomal dominant.
- Clinical Mimic: OI can be mistaken for non-accidental trauma (child abuse). A thorough history, physical, and radiographic survey are essential.
- Mechanism: The defect in collagen triple helix formation leads to structurally weak bones and other connective tissue abnormalities.