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Question: What action is used to assess scapulohumeral rhythm at the scapula or scapulothoracic joint?

Answer: ABduction

Explanation:

Scapulothoracic rhythm is the ratio of motion between the scapulothoracic articulation
and the glenohumeral joint, as the arm ABducts through full range. It
tests for all joints of the shoulder.

Glenohumeral, acromioclavicular, sternoclavicular, and scapulothoracic attach the
axial to the appendicular skeleton. The scapulothoracic
articulation is a false joint, but nonetheless part of the shoulder
complex.

Scapulohumeral rhythm:
(describes the timing of movement at these joints during shoulder elevation.)

  1. first 30 degrees of shoulder elevation involves a "setting phase":

          * The movement is largely glenohumeral.

          * Scapulothoracic movement is small and inconsistent.

  2. after the first 30 degrees of shoulder elevation:

          * The glenohumeral and scapulothoracic joints move simultaneously.

          * Overall 2:1 ratio of glenohumeral to scapulothoracic movement.

You can observe scapulohumeral rhythm by palpating the scapula's position
as a person elevates the shoulder. Helpful scapular landmarks for
palpation are the base of the spine and the inferior angle.

Scapulohumeral
rhythm serves at least two purposes.

  1. It preserves the length-tension relationships of the glenohumeral muscles; the muscles do
not shorten as much as they would without the scapula's upward
rotation, and so can sustain their force production through a larger
portion of the range of motion.

  2. It prevents impingement between the humerus and the acromion. Because of the difference in size
between the glenoid fossa and the humeral head, subacromial impingement
can occur unless relative movement between the humerus and scapula is
limited. Simultaneous movement of the humerus and scapula during
shoulder elevation limits relative (arthrokinematic) movement between
the two bones.

(http://moon.ouhsc.edu/dthompso/NAMICS/scapryme.htm)