Which test is used to help diagnose significant rotator cuff tears and adhesive capsulitis?

Which test is used to help diagnose significant rotator cuff tears and adhesive capsulitis?

• A. Shrug test
• B. Neer test
• C. Drop arm test
• D. Empty can test

Answer: (A)

The shoulder relies on a coordinated effort between the rotator cuff and the muscles that move and stabilize the scapula. The shrug test looks at how the shoulder girdle participates when trying to lift the arm. If the rotator cuff is significantly torn, the humeral head can no longer be stabilized with normal glenohumeral motion, so lifting the arm becomes awkward and the patient may rely on the trapezius to shrug the shoulders to get the arm up. This compensatory shrug is a clue that there is a substantial rotator cuff deficit. In adhesive capsulitis (frozen shoulder), the glenohumeral joint is stiff and motion is restricted, especially with abduction and external rotation. Attempting to elevate the arm often reveals guarding and altered scapulohumeral rhythm, which can produce a noticeable shrug as the patient compensates. Because the shrug test taps into both the need for rotator cuff stability and the ability of the shoulder girdle to participate in motion, it helps pick up either a significant rotator cuff tear or capsular stiffness, making it the most informative choice among the options. The other tests are more specific for particular patterns: the drop arm test mainly signals a full-thickness supraspinatus tear, the empty can test targets supraspinatus weakness, and Neer’s test is about impingement. While those scenarios can co-exist, the shrug test uniquely reflects substantial rotator cuff compromise and adhesive capsulitis in a single bedside maneuver.

The shoulder relies on a coordinated effort between the rotator cuff and the muscles that move and stabilize the scapula. The shrug test looks at how the shoulder girdle participates when trying to lift the arm. If the rotator cuff is significantly torn, the humeral head can no longer be stabilized with normal glenohumeral motion, so lifting the arm becomes awkward and the patient may rely on the trapezius to shrug the shoulders to get the arm up. This compensatory shrug is a clue that there is a substantial rotator cuff deficit.

In adhesive capsulitis (frozen shoulder), the glenohumeral joint is stiff and motion is restricted, especially with abduction and external rotation. Attempting to elevate the arm often reveals guarding and altered scapulohumeral rhythm, which can produce a noticeable shrug as the patient compensates. Because the shrug test taps into both the need for rotator cuff stability and the ability of the shoulder girdle to participate in motion, it helps pick up either a significant rotator cuff tear or capsular stiffness, making it the most informative choice among the options.

The other tests are more specific for particular patterns: the drop arm test mainly signals a full-thickness supraspinatus tear, the empty can test targets supraspinatus weakness, and Neer’s test is about impingement. While those scenarios can co-exist, the shrug test uniquely reflects substantial rotator cuff compromise and adhesive capsulitis in a single bedside maneuver.