Lecture 7: Shoulder

Question 1

Tell me about the bone stability in shoulder
i.e. how much of humeral head is in contact with glenoid cavity.
Has unique shape-depth of ___mm S&I
Lacks the depth and negative pressure of hip

Answer 1

30% at any time

-uniques shape-depth 9mm S&I

Question 2

Static stability
Whats the function of the glenoid labrum?

What are all of the glenohumeral ligaments involved?
Slide 9

Answer 2

• deepends the glenoid
• increases congruity (harmony)
• suction effect
• contributes to 50% of socket depth
• attach for LHB and GH ligaments

Question 3

Dynamic stability:
function of the rotator cuff 
-produces compressive forces across GH joint. 

Function of the scapulothoracic muscles?

Answer 3

Rotator cuff:

• fine control muscle system
• produces compressuce forces across GH joint

Scapulothoracic muscles:

• generate large torques
• lats, deltoid, serratus anterior, pec major
• muscles contributing to scapulo motion: trapezius, rhomboid, lev scap, pec minor.

Question 4

Shoulder Instability:

what are the 3 types?

Answer 4

1. Atraumatic- congenital hypermobility <30yrs
2. Traumatic- specific trauma event
3. Aquired- microinstability, degenerative

Question 5

What are the different sources of shoulder pain?

Answer 5

-Reffered from Musculoskeletal sites
-reffered from viscera (heart, subphrenic, lung)
-radicular causes (cervical spine)
Peripheral nerve entrapment

Question 6

See what movements are occurring within the shouder in a movement arc on slide 18 and 19 and 23

Answer 6

h

Question 7

History

2 types

Answer 7

1. netters
   - history of trauma
   - history of popping, clicking or catching for labral tear

Magee Assessment:
Age- OA, degenerative changes, >35, adhesive capsulitis 45-60
-Trauma- FOOSH mechanisms
-ROM/ positions that aggravate, overuse factors/ jobs
-indications of nerve injury

Question 8

Manual muscle testing for shoulder.
What would a weak IR=
Weak abduction and/ or ER=

Answer 8

test the myotomes for Cx spine
What would a weak IR= subscapularis tears

Weak abduction and/ or ER= subacromial impingement and /or full thickness rot cuff tear

Question 9

What are all of the tests you should do for shoulder pain?

Answer 9

Apleys scratch test pg 26