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Flashcards in Week 4 Deck (100)
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1

What are the 4 joints of the shoulder complex?

- sternoclavicular joint
- acromioclavicular joint
- glenohumeral joint
- scapulothoracic

2

What are the characteristics (articulation and what joint type) of the sternoclavicular joint?

- medial clavicle with notch of manubrium and 1st costal cartilage
- saddle joint - convex on concave

3

Describe the orientation of the saddle joint of the SC joint in the superior to inferior direction and in the anterior to posterior direction.

- superior/inferior - convex on concave (elevation/depression)
- medial/lateral - concave on convex (protraction/retraction)

4

What is the function of the sternoclavicular fibrocartilage?

- promotes stability
- increase joint congruence
- absorbs forces
- helps limit medial movement of clavicle

5

What are the osteokinematics of the SC joint?

- elevation/depression
- protraction/retraction
- anterior/ posterior rotation

6

What are arthrokinematics of elevation/depression of SC joint?

Convex on concave

Elevation
- superior roll, inferior glide

Depression
- inferior roll, superior glide

7

What are arthrokinematics of protraction/retraction of SC joint?

concave on convex

Protraction
- anterior roll and glide

Retraction
- posterior roll and glide

8

What are arthokinetmatics of anterior/posterior rotation of SC joint?

Spin

Posterior Rotation
- Inferior surface turns anteriorly (backward rotation)

Anterior Rotation
- Inferior surface returns to inferior position - only occurs after posterior rotation

9

What is the closed packed position for the SC joint?

full posterior rotation

10

What is the function of the AC joint and what osteokinematic motions are associated with the AC joint?

- allow the scapula to rotate during arm movement

- internal/external rotation
- anterior/posterior tilting
- upward/downward rotation

11

Describe the plane of the scapula.

- around 35 degrees off the frontal plane
- plane where scapula is best in contact with the rib cage

12

What is the purpose of internal/external rotation of AC joint?

important for maintaining contact of scapula on curved thorax during protraction and retraction of clavicle

13

What is the purpose of anterior/posterior tilting of AC joint?

Important for maintaining contact of scapula on curved thorax during elevation and depression of clavicle

14

What is the purpose of upward/downward rotation of AC joint?

Important for positioning glenoid fossa in optimal position in order to maintain contact with humerus

15

What shoulder motions move the scapula in an upward rotation?

flexion and abduction

16

What shoulder motions move the scapula in a downward rotation?

adduction and extension

17

What is closed packed position of the AC joint?

full upward rotation - full shoulder abduction and/or flexion

18

What are the primary and secondary osteokinematic motions associated with the scapulothoracic joint?

Primary
- elevation/depression
- protraction/retraction
- upward/downward rotation

Secondary
- Anterior/posterior tilting
- internal/external rotation

19

Elevation/depression of scapulothoracic joint is a combination of what 2 joint movements?

Elevation
- SC joint elevation and AC joint downward rotation

Depression
- SC joint depression and AC joint upward rotation

20

Protraction/retraction of scapulothoracic joint is a combination of what 2 joint movements?

Protraction
- SC joint protraction and slight AC joint IR

Retraction
- SC joint retraction and slight AC joint ER

21

Upward rotation/downward rotation of scapulothoracic joint is a combination of what 2 movements?

Upward Rotation
- SC joint elevation and AC joint upward rotation
- observed during shoulder flexion/abduction

Downward Rotation
- SC joint depression and AC joint downward rotation

22

Describe and define the angle of inclination and the angle of torsion at the GH joint.

Angle of Inclination - 130-150 degrees in frontal plane

Angle of torsion
- orientation of humeral head w/ the condyles - 30 degrees posterior in traverse plane

23

Define retroversion of the GH joint. What function does normal retroversion serve?

- posterior orientation of humeral head w/ regard to the condyles
- keeps humeral head in contact with glenoid during movement

24

Describe the characteristics and functions of the glenoid labrum and joint capsule.

Glenoid labrum
- Enhances concavity and increases articular surface
- Resists humeral head translations, dissipates forces, protects bony edges
- Attachment of glenohumeral ligaments and tendon of biceps long head

Joint Capsule
- Significant laxity, minimal stability provided
- Potential volume size is 2x size of humeral head
- Reinforced by thicker external ligaments
- Inferior portion is slack in adducted position creating axillary pouch

25

What are the ligaments of the glenohumeral joint?

- superior glenohumeral ligament
- middle glenohumeral ligament
- inferior glenohumeral ligament
- coracohumeral ligament

26

What is the function of the superior glenohumeral ligament?

- Limits external rotation and anterior & inferior translation at 0° abduction
- Slackens when abducted beyond 35-45 degrees

27

What is the function of the middle glenohumeral ligament?

- limits anterior translation from 45-90 degrees abduction and extremes of external rotation

28

What are the components and what is the function of the inferior glenohumeral ligament?

3 components
- anterior band, posterior band, and axillary pouch

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

29

With abduction, the axillary pouch of the inferior glenohumeral ligament resists _____ & ______ translation

inferior and anterior-posterior

30

With abduction and lateral rotation, the anterior band of the inferior glenohumeral ligament resists _______ translation.

anterior