The value of clinical tests in acute full-thickness tears of the supraspinatus tendon: does a subacromial lidocaine injection help in the clinical diagnosis?
A positive lag sign (ERLS or DAT) is indicative of a full-thickness supraspinatus tear, but a negative lag sign does not preclude a tear. After a subacromial injection of lidocaine, the specificity improves whereas the sensitivity is reduced. Overall, in patients with suspected acute rotator cuff tear, clinical tests cannot stand alone in the evaluation the first weeks after an acute injury.
We conclude that edema decreases myosin light chain phosphorylation, leading to decreased intestinal contractile activity.