A biceps brachii rupture can occur at either superior or inferior end but most commonly involves the long head at its proximal attachment to superior glenoid labrum.
The biceps tendon has a fibrous covering (the lacertus fibrosus) that can clinically feel similar to an intact tendon even though the distal biceps tendon has torn.
Trauma-related injury involves the distal part, which is rare and seen in young people. Degenerative causes involve the proximal part of the tendon.
MR imaging features that can help diagnose ruptures include 1:
- depiction of the absence of the tendon distally
- fluid-filled tendon sheath: can be found in most cases 1
- antecubital fossa mass
- muscle oedema: non specific
- muscle atrophy: non specific
A flexed abducted supinated view or FABS position is considered an optimal position from assessment of a distal biceps brachii tendons 3.
On certain imaging planes consider
- partial tearing of biceps tendon
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