Shoulder Motor Control Test (Scapular Dyskinesis): How to Assess It

Many shoulder problems don't show up at rest—they show up during movement. The shoulder motor control test (also called the scapular dyskinesis test) looks at exactly that: how the scapula moves during arm elevation, and whether that movement is "clean" or shows compensatory patterns that could be behind pain or a performance limitation.

What does this test measure?

The test assesses the scapulohumeral rhythm and the quality of scapular movement during active arm elevation. It looks for patterns of scapular dyskinesis: winging, early elevation of the medial or inferior border, or asymmetry between sides—patterns that can be related to weakness of the serratus anterior, lower trapezius, or more general motor control alterations.

Equipment needed

• None (optional: two light weights, for example 1-3 kg, to load the movement and make compensations more visible)

Step-by-step protocol

1. The subject stands without a shirt or in clothing that allows a clear view of both scapulae
2. Stand behind the subject, at a distance that lets you see the entire upper back
3. Ask them to raise both arms in flexion (forward) slowly and in a controlled manner, to the maximum range, and then lower them
4. Repeat the same movement in abduction (out to the sides)
5. If you want to load the pattern, repeat with a light weight in each hand (1-3 kg) and perform several repetitions
6. Observe throughout the entire movement (up and down):

- Whether both scapulae move symmetrically and in sync - Whether winging appears (the medial or inferior border of the scapula lifts off the rib cage) - Whether there's early elevation of the scapula (rising "ahead of time" relative to the humerus) or excessive anterior tilt - At what phase of the movement the alteration appears (raising, lowering, or both)

Common mistakes

• Observing from only one side or without a clear view of both scapulae at once
• Asking for the movement to be performed too quickly, which can mask (or exaggerate) compensations
• Not repeating it several times—mild dyskinesis may not be evident on the first repetition but appears on later ones (fatigue)
• Confusing a normal anatomical asymmetry with functional dyskinesis

How to interpret the result

Result	Interpretation
Symmetric scapular movement, no winging or early elevation	Negative
Winging, early elevation, or clear asymmetry compared to the contralateral side	Positive—suggests scapular dyskinesis (possible weakness/inhibition of serratus anterior, lower trapezius, or a motor control alteration)

Scapular dyskinesis isn't a pathology in itself, but rather an altered movement pattern that can coexist with (or predispose to) other shoulder problems, such as subacromial impingement. That's why it's usually assessed alongside other tests.

Again, this is a screening and observation test, not a definitive diagnosis.

Relationship with other tests

• Winged scapula test — a more specific assessment of scapular winging in static/dynamic conditions, complementary to this test
• Neer test — if scapular dyskinesis appears alongside pain during the elevation arc, it reinforces the suspicion of impingement secondary to poor scapular control

Why tracking it matters

Scapular dyskinesis patterns usually improve with specific motor control work (serratus anterior and lower trapezius activation exercises, scapular proprioception), but improvement is hard to see at a glance from one session to the next. In Movalytics you can record the result of this test (positive/negative and the type of pattern observed) at each assessment and compare how shoulder motor control evolves over time.

Frequently asked questions

Does scapular dyskinesis always cause pain? No. It's common to find dyskinesis patterns in asymptomatic people. Its relevance increases when it coexists with pain or functional limitation. Can this test be assessed with a single repetition? It's better to ask for several repetitions (5-10) and, if possible, with some load, since compensations tend to become more evident with fatigue. What should I do if I detect scapular dyskinesis? The usual approach is to incorporate scapular motor control work (serratus anterior and lower trapezius activation, "wall slides" or similar exercises) and reassess periodically to see if the pattern improves. Note: this test is a screening tool for guidance only and does not replace a medical diagnosis or imaging study.