A novel clinical test for partial tears of the distal biceps brachii tendon: The TILT sign.

Partial tears of the distal biceps brachii tendon are rare. A complete tear of the distal biceps brachii tendon is readily diagnosed on the basis of history and physical examination and has a well-described clinical presentation of acute pain in the antecubital fossa, localized tenderness, swelling, palpable defect, positive hook test, and weakness in forearm supination and elbow flexion. Partial tears, on the other hand, can present more subtly and remain a diagnostic challenge. We present a novel physical examination technique that utilizes the rotational anatomy of the radius. The patient's forearm is passively supinated and pronated with the elbow flexed to 90° while the examiner firmly palpates the dorsal forearm overlying the radial tuberosity. The tuberosity presents itself beneath the examining fingers only in full forearm pronation. A positive test is indicated by tenderness over the radial (or lateral) aspect of the tuberosity (TILT sign) only in full forearm pronation, and not in supination. We have found this diagnostic test to be 100% sensitive for diagnosing partial distal biceps brachii tendon tears over the last five years during which it has been in use. Representative example cases are presented. A positive TILT sign indicates a diagnosis of partial tear of the distal biceps brachii tendon. This simple diagnostic maneuver could facilitate earlier detection of these injuries. Clin. Anat. 31:301-303, 2018. © 2017 Wiley Periodicals, Inc.