Diagnosis

Ulna, extraarticular, avulsion of triceps insertion (AO/OTA 2U1A1)

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Avulsion fracture of the triceps insertion from the olecranon are classified as 21U1A1 fractures.

Lateral radiograph of a typical triceps avulsion.

X-ray taken from Orozco R et al, (1998) Atlas of Internal Fixation. Used with kind permission.