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Dr. Ebraheim’s educational animated video describes the range of motion of the Shoulder Joint, and the ways to check for any medical problem associated with it’s movement.
The normal range of motion:
abduction: moving the upper arm away from the body while keeping the thumb up. the normal range of motion is between 150-180 degrees. The ratio of glenohumeral joint motion to the scapulothoracic joint motion is 2:1 During abduction
shoulder flexion: move the arm in front of the body 180 degrees.
External rotation (lateral rotation): normal range of motion is about 90 degrees. There are two ways to check external rotation of the shoulder.
1-the elbow is bent to 90 degrees and swings the forearm away from the body. Shoulder external rotation is similar to opening of a cabinet door.
2-Abduct and externally rotate the upper limb to 90 degrees.
Internal rotation (medial rotation): normal range of motion is about 70-90 degrees. There are three ways to check internal rotation of the shoulder.
1-Elbow is bent to 90 degrees and swing the elbow inward, similar to closing a cabinet door.
2-Abduct and internally rotate the upper limb to 90 degrees.
3-Maximum internal rotation is measured on basis of the highest spinal process level that can be reached by the thumb. The normal range is usually around T7.
Always check the range of motion actively and passively. Always differentiate the true shoulder motion from the scapulothoracic motion (stabilize the scapula and assess the motion). Measure the internal and external motion bilaterally and compare the total arc of rotation.
Most common cause of painful limitation of the shoulder is from adhesive capsulitis. A painful progressive loss of shoulder motion. It affects both active and passive movement of the shoulder joint. The shoulder is stiff and painful. Occurs due to:
•Inflammation
•Fibrosis
•Scarring
•Contraction of the capsule.
The normal shoulder joint capsule is elastic and allows a great range of motion. Inflammation and thickening of the shoulder capsule may lead to adhesive capsulitis.
Conditions associated with frozen shoulder:
•Diabetes
•Dupuytren's contracture
•Thyroid problems
•Autoimmune disease
•Stroke.
•Rheumatoid arthritis
•Trauma or post surgery
A patient with frozen shoulder will have loss of both active (movement without assistance) and passive (movement with assistance) motion.
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