Term
How many bony attachments
are there of the shoulder to the axial skeleton? |
|
Definition
One:
The clavicle articulates with the sternum
via the sternoclavicular (SC) joint |
|
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Term
What is the purpose and
location of the gleniod labrum? |
|
Definition
Purpose: to deepen the joint for greater congruity, attachment site for capsule
Location: on the glenoid fossa
*fibrocartilagenous lip* |
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|
Term
| When does the clavicle see movement? |
|
Definition
Rotation of the clavicle occurs as an accessory motion when the humerus is elevated above the horizontal position
*cannot happen independently* |
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Term
| During abduction of the arm, what must happen for the greater tubercle of the humerus to clear the coracoacromial arch? |
|
Definition
The Humerus must externally rotate as its elevated above the horizontal
*inadequate leads to impingement* |
|
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Term
| T/F: Neither internal nor external rotation of the humerus is necessary to prevent impingement through scaption |
|
Definition
|
|
Term
| What are the Rotator Cuff muscles? |
|
Definition
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|
Term
| What is adhesive capsulitis? |
|
Definition
Development of dense adhesions and capsular restrictions
Cause:
Primary AC: Idiopathic
Secondary AC: period of pain and/or restricted motion (RA, OA, Trauma, Immobilization) |
|
|
Term
| What is the Scapulohumeral Rhythm/Ratio? |
|
Definition
2:1
2* of glenohumeral motion to
1* of scapular rotation |
|
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Term
| What muscles create upward rotation of the scapula? |
|
Definition
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Term
| The clavicle elevates __* at the SC joint with initial upward rotation of the scapula |
|
Definition
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|
Term
| During abduction of the arm in the frontal plane, the humerus must ____ in order for the greater tubercle of the humerus to clear the coracoacromial arch |
|
Definition
externally rotate
insufficient --> impingement --> pain, inflammation, and eventual loss of function |
|
|
Term
| Why does the humerus medially rotate in flexion? |
|
Definition
As the arm elevates above horizontal, the anterior capsule and ligaments become taut --> medial rotation
*most of the shoulder flexor muscles are also medial rotators of the humerus* |
|
|
Term
| What two muscles help prevent excessive anterior translation/instability of the humeral head against inward rotating forces |
|
Definition
Infraspinatus
Teres Minor |
|
|
Term
| Motion described as scaption is located __* anterior to the frontal plane |
|
Definition
30
Less tension on the capsule in this plane -- more elevation is possible than with pure flexion or abduction |
|
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Term
| When this muscle is un-opposed, it can cause impingement |
|
Definition
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