Podcast
Questions and Answers
What body parts need to move to achieve full shoulder elevation?
Shoulder joint abduction, scapular upward rotation.
What is the most agreed upon rhythm for shoulder joint to shoulder girdle movement?
What is the total degree of shoulder joint and shoulder girdle movement for full elevation?
Shoulder joint = 120 degrees, shoulder girdle = 60 degrees.
Shoulder impingement syndrome results from a structural narrowing of the subacromial space.
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Who proposed the theory regarding impingement on the tendinous portion of the rotator cuff?
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The content of the subacromial space includes the ________ tendon and the ________ of the Biceps Muscle.
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Which acromion shape is referred to as problematic?
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All patients improve after removing the hooked acromion.
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Can the shape of the acromion change with age?
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Study Notes
Shoulder Elevation Biomechanics
- Shoulder joint abduction combines with scapular upward rotation to achieve full shoulder elevation.
- First 30 degrees of elevation primarily involve the shoulder joint.
- The accepted rhythm for optimal shoulder elevation is 2:1, meaning the shoulder joint moves 2 degrees for every 1 degree of shoulder girdle movement.
- Shoulder joint contributes 120 degrees and shoulder girdle contributes 60 degrees.
- Shoulder joint external rotation is required for full abduction.
- Infraspinatus and teres minor muscles are involved in external rotation of the shoulder from 90 degrees.
Shoulder Anatomy & Impingement
- The subacromial space is located beneath the acromion and contains the supraspinatus tendon, long head of biceps tendon, and subacromial bursa.
- Shoulder impingement syndrome is characterized by structural narrowing of the subacromial space, leading to compression of the subacromial space contents.
- Dr. Charles Neer, in 1972, proposed that impingement is caused by the coraco-acromial ligament and anterior acromion impinging on the rotator cuff tendons. He suggested acromioplasty to remove the anterior acromion and coraco-acromial ligament for treatment.
- There are three forms of acromion: flat, curved, and hooked.
- A hooked acromion is considered a significant risk factor for shoulder impingement.
- Most patients do not improve after acromioplasty, suggesting other contributing factors beyond acromial shape.
- Hooked acromion may exist in asymptomatic individuals.
- Further research is needed to determine if acromial shape changes with age.
Considerations
- The presented information relies on a combination of logic (philosophy) and scientific experimentation (evidence).
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Description
Test your knowledge on shoulder elevation biomechanics and anatomy. This quiz covers the mechanics of shoulder joint movements, scapular upward rotation, and shoulder impingement syndrome. Assess your understanding of muscle involvement and anatomical structures involved in shoulder function.
