Shoulder Kinematics

These flashcards cover key concepts from the lecture on shoulder kinematics, including anatomy, joint function, movements, and common disorders.

What are the primary joints involved in shoulder kinematics?

The main joints are the Sternoclavicular (SC) joint, Acromioclavicular (AC) joint, and Glenohumeral (GH) joint.

What movement occurs at the SC joint for elevation?

Elevation at the SC joint involves the convex clavicle rolling and sliding down on the concave sternum.

Describe the configuration of the Acromioclavicular (AC) joint.

The AC joint is a gliding/plane joint with a variable shape that can be flat to slightly convex or concave.

What is meant by the term 'close packed position' for the shoulder?

The close packed position for the GH joint is abduction around 90-100 degrees with external rotation.

Identify the primary movements of the scapulothoracic joint.

The scapulothoracic joint allows for upward/downward rotation, protraction/retraction, and internal/external rotation.

What is the significance of the glenoid labrum?

The glenoid labrum improves stability of the GH joint.

How is shoulder elevation achieved at the SC and AC joints?

Scapulothoracic elevation is achieved through the summation of elevation at the SC joint and downward rotation at the AC joint.

What is the role of the coracoclavicular ligament?

The coracoclavicular ligament helps limit anterior and posterior dislocation of the clavicle.

What is the capsular pattern of the GH joint?

The capsular pattern for the GH joint shows that external rotation is most limited, followed by abduction, then internal rotation.

Explain the concept of shoulder disorders such as a rotator cuff tear.

A rotator cuff tear, commonly involving the supraspinatus muscle, is a shoulder condition that affects the stability and functionality of the GH joint.