Shoulder joints

Question 1

What are the joints in the shoulder

Answer 1

acromio-clavicular joint
Sterno-clavicluar joint
Glenohumeral joint
Scapulo-thoracic joint

Question 2

acromio-clavicular joint explain

Answer 2

-synovial plane joint
-3 degrees freedom
-stability provided by coracoclavicular ligment, acromioclavicular ligament and the deltoid and trapezius as they cross the joint

-upward and downward rotation
anterior+ posterior tilting
internal + external rotation

Question 3

Sterno-clavicular joint

Answer 3

-synovial saddle joint
- 3 degrees freedom
-very stable joint, more likely clavicle to fracture before sterno-clavicular joint

-elevation-depression
protraction+ retraction
circumduction

Question 4

Glenohumeral joint

Answer 4

• ball and socket joint
• 3 degrees freedom
  -active stability - rotator cuff muscles

-elevation + depression
flexion + extension
internal + external rotation

Question 5

scapulo-thoracic joint

Answer 5

• not true synovial joint
• two joint system
• 6 degrees freedom
• elevation + depression
  upward + downward rotation
  protraction + retraction

“dysfunction” motion seen typically in 3 presentations
1. anteriorly tilted (prominent at inferior angle)
2. Internally rotated (winging)
3. downwardly rotated