Glenohumeral Joint

Question 1

GHJ

Answer 1

Most mobile joint in the body

Question 2

Glenoid Fossa

Answer 2

1/3-1/4 head

Question 3

Glenoid Labrum

Answer 3

Congruency
Compressional stress
Poor boney fit
Loosest fibrous joint capsule

Question 4

Glenoid Labrum: FC Pads Function

Answer 4

Increase boney fit

Spreads out to decrease stress

Question 5

GHJ: Capsule

Answer 5

Tissues are sagging, auxiliary recess
Falls inferior
Weakest part
MOI: luxation/subluxation

Question 6

What is the common arm position for GH dislocation?

Answer 6

Outstretched arm

Question 7

GHJ: Ligaments

Answer 7

Coracohumeral
Coracoacromial
Glenohumeral

Question 8

GHJ: Ligaments: Coracohumeral

Answer 8

Coracoid Process
Greater & Lesser Tubercles
Spans Bicipital Groove
Capsular
Limits Inferior Translation
Limits Adduction

Question 9

GHJ: Ligaments: Coracoacromial

Answer 9

Extrinsic (same bone)
Coracoid Process
Acromion
Roof of CA Arch
Limits Superior movement of humerus

Question 10

GHJ: Ligaments: Glenohumeral (Capsular)

Answer 10

Superior - limits post trans, adduction
Middle
Inferior - limits ant trans, abduction

*All Limits ER (prime)

Question 11

Transverse Ligament of Humerus: Function

Answer 11

Support bicipital tendon along with coracohumeral

Question 12

Scapulohumeral Rhythm

Answer 12

Abduction ROM: 160-180
90 pure GH ABD
60 scapular Upward
30 Additional ABD w/ ER @ SCJ
*clears greater tubercle
*provides articular surface

Question 13

Glenohumeral:Scap Motion (Frontal)

Answer 13

2:1

Question 14

Glenohumeral:Scap Motion (Scapular)

Answer 14

4: 1 (0-24)
5: 4 (24-180)

Question 15

GHJ: Movements in sagittal

Answer 15

Flexion (GH)
Posteriorly Tip (Scap)
Elevation

Extension (GH)
Anteriorly Tip (Scap)
Depression

Question 16

GHJ: Movements in transverse

Answer 16

Horizontal ABD (GH)
Adduction/Retraction (Scap)

Horizontal ADD (GH)
Abduction/Protraction (Scap)

Question 17

GHJ: Movements in frontal/scapular

Answer 17

Abduction (GH)
Upward Rotation (Scap)
Elevation

Adduction (GH)
Downward Rotation (Scap)
Depression

Question 18

Rotator Cuff are what kind of ligaments?

Answer 18

Dynamic

Question 19

Muscles of the Rotator Cuff?

Answer 19

Subscapularis (Anterior)
Supraspinatus (Superior)
Infraspinatus (Posterior)
Teres Minor (Posterior)

Question 20

Rotator Cuff Muscles: Functions

Answer 20

Pulls head into GH Fossa
Isometrically
Allows pivoting on head while other muscles are controlling humeral movements