3. When performing horizontal abduction with a relatively fixed scapula, what di

Question

3. When performing horizontal abduction with a relatively fixed scapula, what direction does the humerus roll and glide within the glenohumeral joint?

A. Identify the bone that makes up the convex surface of the joint.

B. Identify the bone that makes up the concave surface of the joint.

C. Select the appropriate rule to apply and provide a brief description as to why you made your selection.

D. Identify the direction the humerus is rolling and provide a brief explanation as to how you came to this answer.

E. Identify the direction the humerus is gliding and provide a brief explanation as to how you came to this answer.

Explanation / Answer

When performing horizontal abduction with a relatively fixed scapula, what direction does the humerus roll and glide within the glenohumeral joint?

Plane of motion would be frontal plane and the direction will be sagittal axis through the center of humerus head.

[a] The bone that makes up the convex surface of the joint is the proximal end of humerus consists of the head, anatomical neck, and greater and lesser tubercles.

[b] the bone that makes up the concave surface of the joint are coracoid process and scapula.

[c] In case of Glenohumeral articulation, the head of humerus is convex and slides opposite to the movement humerus in case of abduction

[d] - the direction the humerus is rolling is superiorly and glides inferiorly. If the concave surface is immobilized and the convex surface slides in it, the convex surface rolls and glide in opposite directions, while vice versa is also true.

[e] Humeral head glides Posteriolaterally in and Anteriomedially glenoid cavity from 0-70 and 0-90 degree respectively. as an arms of shoulders abduction.

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