A small bursa between the lateral head of triceps and the posterior humeral cortex at the spiral groove level, reducing friction as the lateral head slides over the posterior humerus during elbow extension.
Triceps lateral head bursitis is a cause of posterior lateral arm pain with elbow extension, a component of the triceps pain complex. It is in the territory of the radial nerve at the spiral groove and must be distinguished from radial nerve pathology by clinical examination. Ultrasound identifies the bursa between the lateral head and the humeral cortex.
Bursal inflammation between the triceps lateral head and posterior humerus producing lateral arm pain with resisted elbow extension, managed with injection.
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