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Kinesiology > GH Joint > Flashcards

GH Joint Flashcards

1
Q

osteology

A

glenoid fossa + head of humerus

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2
Q

joint type

A

synovial; ball and socket

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3
Q

angle of inclination

A

130-150 degrees in frontal plane

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4
Q

retroversion

A

posterior orientation of humeral head with regard to the condyles

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5
Q

angle of torsion

A
  • 30 degrees posterior in transverse plane

- also described as “30 degrees of retroversion”

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6
Q

increased humeral retroversion (greater than 30 degrees) may result in increased ____ ROM and reduced ____ ROM

A
  • ER

- IR

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7
Q

the glenoid labrum enhances ____ and increases ____

A
  • concavity

- articular surface

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8
Q

3 main functions of the glenoid labrum

A
  • resists humeral head translations
  • dissipates forces
  • protects bony edges
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9
Q

the glenoid labrum is an attachment for what structures?

A
  • GH ligaments

- tendon of biceps long head

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10
Q

what are the primary characteristics of the GH joint capsule?

A
  • significant laxity, minimal stability
  • potential vol. size is 2x the size of the humeral head
  • reinforced by thicker external ligaments
  • inferior portion is slack in ADducted position, creating axillary pouch
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11
Q

tightness in the posterior shoulder capsule may produce increased ____ which decreases the ____ space

A
  • anterior humeral head translation

- subacromial space

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12
Q

superior GH ligament

A
  • limits ER and anterior/inferior translation at 0 degrees of ABD
  • slackens when ABducted beyond 35-45 degrees
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13
Q

middle GH ligament

A

-limits anterior translation from 45-90 degrees of ABD and extremes of ER

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14
Q

inferior GH ligament

A
  • anterior band, posterior band, axillary pouch

- primary stabilizer beyond 45 degrees of ABD or with combined ABD and rotation

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15
Q

during ABD, what does the axillary pouch of the inferior GH ligament resist?

A

inferior and anterior/posterior translation

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16
Q

during ABD and lateral rotation, what does the anterior band of the inferior GH ligament resist?

A
  • anterior translation

- also resists anterior translation in neutral position

17
Q

during ABD and medial rotation, what does the posterior band of the inferior GH ligament resist?

A

posterior translation

18
Q

coracohumeral ligament

A

limits inf translation and ER of humeral head with arm in dependent position

19
Q

rotator cuff

A
  • reinforces GH joint capsule

- protects and actively stabilizes GH joint with dynamic activities

20
Q

2 areas where rotator cuff does not reinforce

A
  • inferiorly

- region btw subscap and supraspinatus (rotator interval)

21
Q

what reinforces the rotator interval?

A
  • biceps long head
  • coracohumeral ligament
  • sup/middle GH ligaments
22
Q

osteokinematics of the GH joint

A
  • flexion/extension
  • ABD/ADD
  • ER/IR
23
Q

arthrokinematics of the GH joint

A
  • spin
  • sup/inf glide
  • ant/post glide
24
Q

GH joint flexion AK

A
  • superior roll, inferior glide (opposite bc convex humerus is moving on concave glenoid)
  • causes tension throughout the capsule
25
Q

slight ____ translation may occur at end range flexion due to ____ in posterior capsule

A
  • anterior

- tension

26
Q

GH joint extension AK

A

inferior roll, superior glide

27
Q

GH joint ADD AK

A

inferior roll, superior glide

28
Q

GH joint ABD AK

A

superior roll, inferior glide

29
Q

ABD is usually accompanied by ____

A

ER

30
Q

what does supraspinatus contraction do to the superior capsule?

A

tightens it

31
Q

what happens to inferior GH ligament during ABD?

A

tightens

32
Q

GH joint ER AK

A

posterior roll, anterior glide

33
Q

GH joint IR AK

A

anterior roll, posterior glide

34
Q

GH closed packed position

A

90 degrees ABD and full ER, or full ABD and ER

35
Q

GH capsular pattern

A

ER > ABD > IR

Kinesiology (9 decks)

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