Term
| For AP Oblique shoulder (Grashey method), how should the glenoid cavity, joint space, and coracoid be shown? |
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Definition
| glenoid cavity open and without thorax superimposition, lateral coracoid process demonstrated with approx. 1/4" superimposition of humeral head. |
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Term
| For AP Oblique shoulder (Grashey method), how should the clavicle be shown? |
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Definition
| With some longitudinal foreshortening. However, on a recumbent patient, it appears more vertical. |
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Term
| For AP Oblique shoulder (Grashey method), where do you center and what should be in the center of the collimated field? |
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Definition
| Center 2" medial and 2" inferior to superolateral border of the shoulder; the GHJ is at the center of the collimated field. |
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Term
| For AP Oblique shoulder (Grashey method), what should be included? |
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Definition
| glenoid cavity, humeral head, coracoid and acromion processes, and distal clavicle |
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Term
| For AP Oblique shoulder (Grashey method), what part of the patient's anatomy should be parallel with IR? |
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Definition
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Term
| For AP Oblique shoulder (Grashey method), how would too much/too little obliquity affect the coracoid process? |
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Definition
Too much - more than 1/4" lateral tip will superimpose the humeral head
Too little - less than 1/4"... |
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Term
| For AP Oblique shoulder (Grashey method), if the patient is recumbent, what may happen to the clavicle? |
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Definition
| It may be demonstarted more vertical in position (image 17) |
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Term
| For AP Oblique shoulder (Grashey method), if too little obliquity, how is thorax in relation to scapular neck/glenoid cavity? |
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Definition
| Even further apart than in normal (where there is no s/i) |
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Term
| For AP Oblique shoulder (Grashey method), if overobliqued, what happens to glenoid cavity? |
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Definition
| Shown with s/i of thorax. |
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Term
| For AP Oblique shoulder (Grashey method), what happens to clavicle with too much/too little obliquity? |
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Definition
Too much - excessive longitudinal foreshortening
Too little - little foreshortening is seen |
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Term
| For PA Oblique (Scapular Y) shoulder, what three things form the Y? |
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Definition
| Coracoid, acromion, scapular body |
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Term
| For PA Oblique (Scapular Y) shoulder, which two scapular borders are s/i? |
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Definition
| lateral (axiallary) and vertebral |
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Term
| For PA Oblique (Scapular Y) shoulder, what is the MCP angle and arm position? |
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Definition
| 45 degrees if arm is hanging freely at the side; 60 degrees if arm is abducted across the chest |
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Term
| For PA Oblique (Scapular Y) shoulder, how is the glenoid cavity shown? |
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Definition
| On end (like the rounded end of a dowel) |
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Term
| For PA Oblique (Scapular Y) shoulder, the scapular body should NOT be s/i over what? |
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Definition
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Term
| For PA Oblique (Scapular Y) shoulder, which border is thick and which is thin? |
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Definition
| Lateral (axillary) border is thick, vertebral (medial) border is thin |
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Term
| For PA Oblique (Scapular Y) shoulder, what happens to the two borders with excessive obliquity? insufficient obliquity? |
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Definition
| Excessive obliquity: axillary border next to ribs, vertebral border shown laterally; insufficient: axillary border shown laterally, vertebral next to ribs |
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Term
| AP oblique scapular Y follows the same imaging criteria, but _____ and ____ are magnified. |
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Definition
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Term
| What is the centering point for PA oblique scapular Y? |
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Definition
| 2" to 2-1/2" inferior to top of shoulder. |
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Term
| What percentage of dislocations are anterior? |
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Definition
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Term
| For PA Oblique (Scapular Y) shoulder, in a normal shoulder (no dislocation)where is the humeral head shown? |
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Definition
| over the junction of the Y |
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Term
| For PA Oblique (Scapular Y) shoulder, if there is anterior dislocation, humeral head is where? if posterior? |
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Definition
| anterior - beneath the coracoid process; posterior - beneath the acromion |
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Term
| fractures of the proximal humerus can be evaluated by checking what? |
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Definition
| alignment of humeral head and shaft |
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Term
| For PA Oblique (Scapular Y) shoulder, how is longitudinal foreshortening of the scapula prevented? |
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Definition
| Vertical alignment of MCP (not tipping forward or backward)) |
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Term
| For PA Oblique (Scapular Y) shoulder, if upper MCP is tilted forward, what happens to coracoid, acromion, scapular angle and clavicle? |
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Definition
| the coracoid and acromion move inferior and the scapular angle move superiorly above the clavicle |
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Term
| For PA Oblique (Scapular Y) shoulder, if patient is kyphotic, how should CR be angled? |
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Definition
| CR s/b perpendicular to vertebral border. For PA, angle caudal, for AP, angle cephalad |
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