Triceps bony avulsion

Avulsion injury of the triceps tendon is an uncommon injury. It is one of the least common injuries to elbow but is nevertheless commoner than an intramuscular triceps tear.

Patients usually usually present with regional pain, swelling and inability to extend to the elbow with an appropriate antecedent history of trauma.

Mechanism

Usually occurs from an eccentric contraction against forced flexion or a direct blow to the elbow 3.

Plain film

May show soft tissue thickening along the posterior arm +/- an avulsed bony fragment off the olecranon.

Ultrasound

The avulsed bone fragment may be identifed with a targeted scan along with soft tissue thickening and fluid.

MRI

Will additionally show a thickened +/- retracted tendon. Regional oedema and fluid seen seen as:

  • T2: high signal
  • STIR: high signal

This injury requires surgical fixation.

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Article information

rID: 9662
Tag: cases
Synonyms or Alternate Spellings:
  • Bony avulsion of the triceps

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