Abnormal tendon morphology Long head of biceps tendon dislocation Dislocation or subluxation of the long head of the biceps tendon out of the bicipital groove (as documented by magnetic resonance imaging of the shoulder) or dynamic ultrasound of the shoulder showing subluxation or dislocation of the long head of the biceps tendon out of the bicipital groove. LHBT dislocation Isolated dislocation of the long head of the biceps is a rare entity. In most cases, dislocation of the biceps tendon out of the bicipital groove is usually associated with tears of the subscapularis tendon or massive rotator cuff tears (or both).