Conference 4: Shoulder & Arm Flashcards

1
Q

1

A

Clavicle

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2
Q

2

A

Scapula

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3
Q

3

A

humerus

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4
Q

1

A

Coracoid process

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5
Q

2

A

Acromion process

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6
Q

3

A

Glenoid fossa

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7
Q

4

A

head of humerus

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8
Q

5

A

greater tubercle of humerus

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9
Q

What is the diagnosis?

A

Anterior dislocation of the head of the humerus

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10
Q

What provides normal shoulder contour under deltoid just distal to the acromion?

A

Greater tubercle

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11
Q

The longitudinal axis of humerus normally points toward what part of the shoulder?

A

Acromion

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12
Q

Why does the right arm appear lengthened with the right elbow lower than the other elbow?

A

Dislocated humeral head is now mostly located inferior to the glenoid fossa

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13
Q

What are the normal anatomic factors that make the shoulder joint vulnerable to dislocation?

A
  1. Poor bony fit of round humeral head and shallow socket of the glenoid fossa
  2. Relatively loose joint capsule
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14
Q

What structures help maintain contact of the humeral head with the glenoid fossa?

A

Rotator cuff muscles

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15
Q

Identify the Rotator Cuff Muscles and their functions.

A
  1. supraspinatus: lateral abduction
  2. infraspinatus: external rotation
  3. teres minor: external rotation
  4. subscapularis: internal rotation
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16
Q

Where is there no muscular reinforcement of the joint capsule?

A

Inferiorly

17
Q

What anatomic relationships makes the axillary nerve vulnerable to injury in shoulder dislocation?

A

Because the axillary nerve courses anterior and inferior to the glenohumeral joint, it will be placed on traction by an anteroinferior dislocation.

18
Q

What is the lesion visible in this x-ray?

A

Midshaft fracture of humerus

19
Q

1

A

Head of humerus

20
Q

2

A

glenoid fossa

21
Q

3

A

joint capsule

22
Q

4

A

supraspinatus

23
Q

5

A

Clavicle

24
Q

6

A

Acromion

25
Q

7

A

subacromial subdeltoid bursa

26
Q

8

A

Greater tubercle

27
Q

9

A

deltoid

28
Q

10

A

articular cartilage