L5.3 - Shoulder Complex

Question 1

In what position is there greatest stability in the shoulder complex?

Answer 1

During abduction and external rotation - paradoxically, this is also the position for dislocation

Question 2

2 Physiological Joints of the Shoulder Complex

Answer 2

1) Subdeltoid - allows Supraspinatus to abduct

2) Scapulothoracic - Scapula sitting against ribcages

Question 3

SC Joint - Ant or post sublaxation is worse?

Answer 3

Post - subclavian and carotid artery are compromised posteriorly

Question 4

What joint is damaged in shoulder separation injuries?

Answer 4

AC Joint

Question 5

Coracoid process of scapula is found more anteriorly or posteriorly?

Answer 5

Anteriorly

Question 6

Lesser tubercle vs greater tubercle of humerus - which one is found more anteriorly?

Answer 6

Lesser tubercle

Question 7

Painful arc syndrome?

Answer 7

Inflammation of the tendons of rotator cuff muscles as they pass through subacromial space - can’t pick up arm past 15 degrees (as supraspinatus is affected)
*BUT if doctor helps patient go past 15 degrees, deltoid acts on it and patient can move

Question 8

Glenohumeral rhythm is when the ratio of movement for scapula : humerus is

Answer 8

1:2 e.g. 60 degrees of movement at scapula is 120 in humerus

Question 9

Frozen shoulder

Answer 9

Adhesive capsulitis where capsule is inflamed and calcification occurs which restricts movement

Question 10

Posterior GH Joint dislocation is rare - what are two things that can cause it?

Answer 10

Seizures or Electrical shock