Shoulder

Question 1

Normal AC joint space

Answer 1

< 5 mm

• widening indicates injury to AC ligament

Question 2

Normal CC distance

Answer 2

< 11-13 mm

• wide range of normal variation
• widening indicates injury to CC ligaments

Question 3

What percentage of asymmetry is considered abnormal for AC joint spaces?

Answer 3

> 50%

Question 4

What maneuver can unmask an AC joint injury?

Answer 4

Passive traction

Question 5

Grade I AC sprain

Answer 5

Local pain with normal radiographs

Question 6

Grade II AC sprain

Answer 6

• widened AC joint space

- normal CC joint space

Question 7

Grade III AC sprain

Answer 7

• widened AC and CC joint spaces

- CC joint space widened < 100% relative to contralateral side

Question 8

Grade IV AC sprain

Answer 8

Posterior displacement of clavicle into trapezius

Question 9

Grade V AC sprain

Answer 9

• widened AC and CC joint spaces
• CC joint space widened > 100% relative to contralateral side

essentially a severe grade III AC sprain

Question 10

Grade VI AC sprain

Answer 10

Inferior displacement of the clavicle

Question 11

Communicating bursae located between the acromion and humeral head

Answer 11

Subacromial and subdeltoid bursae

Question 12

Contrast in the subacromial/subdeltoid bursae after injection into the GHJ indicates…

Answer 12

…a complete rotator cuff tear

Question 13

Name the 4 bursae in the shoulder

Answer 13

Subacromial
Subdeltoid
Subscapular
Subcoracoid