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12 Cards in this Set
- Front
- Back
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three ossification centers of proximal humerus
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central articular segment
greater tuberosity lesser tuberosity |
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when epiphysis of each region forms
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central articular segment - 4-6 months
greater tuberosity - 3 yrs lesser tuberosity - 5 yrs |
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when do centers of ossification coalesce
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4-6 yrs
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when fuse with humeral metaphysis
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20-23 yrs
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mean humeral head retroversion
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18-30 degree (10-55) relative to epicondylar axis of distal end of humerus
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plane of glenohumeral joint
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30 degree anterior to the coronal plane
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humeral head radius of curvature
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22-25 mm
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surface area of glenoid relative to humeral head
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25-30%
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characteristics of labrum
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predominantly fibrous, fibrocartilaginous at attachment to glenoid rim
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how much does labrum increase the depth of the glenoid fossa
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50%
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most important ligament support
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inferior glenohumeral ligament complex (anterior and posterior bands on either side of axillary pouch)
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most of blood supply to humeral head
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arcuate artery supplied by the anterior humeral circumflex a (from 3rd division of axillary artery just above the teres major)
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