Rupture of the distal biceps tendon most commonly occurs following a sudden eccentric load applied to a flexed elbow with the forearm in supination. Clinically, patients typically present with acute pain in the antecubital fossa accompanied by weakness of elbow flexion and forearm supination. While the diagnosis is often suspected clinically, the degree of proximal tendon retraction seen on imaging can vary considerably. One of the key structures responsible for this variability is the lacertus fibrosus, also known as the bicipital aponeurosis.
If you’ve encountered a similar case or have thoughts on evaluating the lacertus fibrosus with ultrasound, I’d love to hear your perspective – please leave a comment below.