Term
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Definition
- Supraspinatus
- Infraspinatus
- Teres Minor
- Subscapularis
- Provide stability to the GH joint
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Term
| Supraspinatus Attachments |
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Definition
- supraspinous fossa of scapula
- greater tubercle of humerus
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Term
| Supraspinatus GH Movements |
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Definition
- Abduction from neutral
- Compress humeral head into glenoid fossa
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Term
| Supraspinatus Nerve Innervation |
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Definition
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Term
| Infraspinatus Attachments |
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Definition
- Infraspinous fossa of scapula
- Greater tubercle of humerus
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Term
| Infraspinatus GH Movements |
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Definition
- External Rotation
- Inferior translation of humeral head in glenoid fossa
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Term
| Infraspinatus Nerve Innervation |
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Definition
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Term
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Definition
- Lateral border of scapula
- Greater tubercle of humerus
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Term
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Definition
- External rotation
- Adduction (minor contribution)
- Inferior translation of humeral head in glenoid fossa
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Term
| Teres Minor Nerve Innervation |
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Definition
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Term
| Subscapularis Attachments |
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Definition
- Subscapular fossa of scapula
- Lesser tubercle of humerus
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Term
| Subscapularis GH Movement |
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Definition
- Internal rotation
- Inferior translation of humeral head in glenoid fossa
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Term
| Subscapularis Nerve Innervation |
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Definition
- Upper subscapular nerve
- Lower subscapular nerve
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Term
| Role as Dynamic Shoulder Stabilizers |
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Definition
- Tendons insert into joint capsule strengthening and reinforcing it
- Loss of rotator cuff leads to loss of GH stability
- Maintain humeral head in glenoid fossa
- prevent lateral displacement
- works with oblique orientation of glenoid fossa
- Provides a force couple with the deltoid
- inferior translation of humeral head during initial 60 degrees abduction
- prevent cranial migration
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Term
| Suprascapular Nerve Entrapment |
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Definition
- usually due to trauma
- most common at suprascapular notch
- superior transverse scapular ligament over the notch
- nerve (not artery) passes under the ligament prior to innervating both supraspinatus and infraspinatus
- As wraps around spine of scapula (spinoglenoid notch)
- both nerve and artery
- prior to innervating infraspinatus
- 50% of people have a CT band over the nerve here
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Term
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Definition
- Anterior-inferior most common (weakest part of capsule)
- May result in tear of subscapularis
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Term
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Definition
- Tendon and bursa impinged between acromion process and greater tubercle
- More common with more hook shaped acromion
- Overuse and inflammation
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Term
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Definition
- Supraspinatus most common due to a zone of hypovascularity
- Increased risk with abnormal acromion process
- Common causes
- High velocity trauma
- baseball
- blow to arm while abducted and externally rotated (while throwing)
- Overuse/Degeneration
- WC athletes
- Swimmers
- Repetitive overhead activities
- Rotator Cuff Tear --> loss of GH stability and a resulting unstable shoulder
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