SC Joint Flashcards

(27 cards)

1
Q

what joints make up the shoulder complex?

A
  • SC joint
  • AC joint
  • GH joint
  • Scapulothoracic “joint” (physiologic joint; scapula and ribcage with muscle in between)
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2
Q

the shoulder complex can be said to have ____ with dynamic ____

A

mobility with dynamic stability

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3
Q

why is the shoulder complex susceptible to dysfunction and instability?

A

due to competing mobility and stability demands

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4
Q

SC joint = ____ moving on ____

A

clavicle moving on sternum

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5
Q

what articulation forms the SC joint?

A

medial clavicle with notch formed by manubrium and 1st costal cartilage

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6
Q

what type of joint is the SC joint?

A

saddle joint

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7
Q

when the clavicle is moving medial to lateral on the sternum, what is the convex/concave relationship?

A

concave on convex

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8
Q

when the clavicle is moving anterior to posterior on the sternum, what is the convex/concave relationship?

A

convex on concave

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9
Q

what increases congruency between the articulating surfaces of the SC joint?

A

SC disc (fibrocartilage disc/meniscus)

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10
Q

how does the SC disc promote stability in the SC joint?

A
  • increases joint congruence
  • absorbs forces
  • helps limit medial movement of clavicle
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11
Q

what are the resting characteristics of the SC joint?

A
  • wedge-shaped

- open superiorly

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12
Q

OK of the SC joint

A
  • elevation/depression
  • protraction/retraction
  • ant/post rotation (spin)
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13
Q

AK of the SC joint

A
  • sup/inf
  • ant/post
  • spin
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14
Q

what is our reference point when describing OK of the SC joint?

A

distal (or lateral) clavicle

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15
Q

what is the convex/concave relationship during elevation/depression of the SC joint?

A

convex on concave

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16
Q

describe elevation of SC joint

A
  • lateral clavicle rotates upward

- superior roll, inferior glide

17
Q

describe depression of SC joint

A
  • lateral clavicle rotates downward

- inferior roll, superior glide

18
Q

what does the SC disc do during elevation/depression?

A

remains stationary

19
Q

what does the SC disc do during protraction/retraction?

A

moves with the clavicle

20
Q

what is the convex/concave relationship during protraction/retraction of the SC joint?

A

concave on convex

21
Q

describe protraction of SC joint

A
  • lateral clavicle moves anteriorly

- anterior roll and glide

22
Q

describe retraction of SC joint

A
  • lateral clavicle moves posteriorly

- posterior roll and glide

23
Q

anterior/posterior rotation occurs around the clavicle’s _____ axis

24
Q

ant/post rotation occurs as a ____ between the saddle-shaped surfaces

25
describe post rotation of SC joint
- occurs when you elevate your arm/shoulder - inferior surface turns anteriorly - also described as backward rotation
26
describe ant rotation of SC joint
- can only occur after post rotation, when you're coming back to your resting position - inferior surface returns to inferior position - minimal motion from neutral
27
what is the closed packed position of the SC joint?
full posterior rotation