Abnormal joint physiology Popeye sign 2025-10-26T18:48:12Z The Popeye sign involves hump formation caused by bulging of the biceps muscle because of biceps tendon tear. The bulging is more noticeable with elbow flexion and is said to resemble the biceps muscle of the cartoon character Popeye. Exaggerated bulging of the belly of the biceps muscle upon contraction.