The AO/OTA classification of fractures uses three hierarchical alphanumeric levels. Which level indicates the fracture 'type' based on morphology?
- A First level (bone segment number)
- B Third level (subgroup number 1-3)
- C Second level (letter A, B, or C) ✓
- D Fourth level (qualifier)
Correct answer: C. Second level (letter A, B, or C)
Explanation
In the AO/OTA classification, the first level identifies the bone and segment (e.g., 42 = tibia, diaphysis). The second level uses letters A, B, or C to denote fracture 'type' (A = simple, B = wedge/partial articular, C = complex/complete articular). The third level (numbers 1–3) denotes the 'group' within each type, further specifying morphology. This hierarchical structure guides prognosis and surgical planning.
Reference: Maheshwari Essential Orthopaedics, 6th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.