3. Scapulohumeral rhythm Using the following procedures determine the range of m

Question

3. Scapulohumeral rhythm Using the following procedures determine the range of motion in the shoulder of the movements listed, first with the scapula fixed and then with the scapula unrestricted For a fixed scapula place one hand across the shoulder of the subject in such a way that the little finger is in contact with both the acromion process and the heel of the hand is on the scapular spine. Allow no scapular motion. When the scapula does begin to move instruct the subject to stop shoulder joint motion and hold the position for measurement. For t he free scapula apply no restriction To measure the range of motion for shoulder flexion and hyperextension place the axis of the goniometer over the greater tubercle of the humerus on the lateral aspect of the shoulder joint. Hold the fixed arm of the goniometer in a position parallel to the midline of the trunk. The free arm of the goniometer should be aligned with the lateral epicondyle of the humerus for measurement. To measure shoulder abduction place the axis of the goniometer at a point which approximates joint center on the posterior aspect of the shoulder. Hold the fixed arm of the goniometer in a position parallel to the midline of the trunk. The free arm of the goniometer should be aligned with the lateral epicondyle of the humerus for measurement. Record the total degrees of motion measured under each condition. Fixed scapula Free scapula Flexion Hyperextension Abduction How much difference is there between the two conditions for flexion? hyperextension? Abduction? Explain why (anatomically) such differences exist.

Explanation / Answer

For Fixed Scapula -

Flexion - 20 degree

Hyperextension - 60 degree

Abduction - 110 degree

For Free Scapula -

Flexion - 30 degree

Hyperextension - 90 degree

Abduction - upto 180 degree

Difference -

Flexion - 10 degree

Hyperextension - 30 degree

Abduction - 70 degrees

Explanation - this difference in the degrees can only be seen on then person suffering from "Scapular Dyskinesia" it is a abnormality cause because of injury or genetic defect. Scapulas Dyskinesia leads to dysfunction of scapulohumeral rhythm which is a harmonious interaction of scapula and humerus bone while they perform any action.

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