Scapulocostal, Sternoclavicular, Aromioclavicular and Shoulder Joints Flashcards
which joint can be described as a physiological joint (no true articulation)
Scapulothoracic Joint
Scapula with Thoracic cage
movement of the scapulothoracic joint is permitted by
Any movement at the scapulothoracic joint will result in movement at both of these joints
- by the muscles around it
what is the Scapulothoracic Joint role? (4)
Provides a movable base for the Humerus, hence increasing arm ROM at the shoulder joint
Helps deltoid function with proper tension with the arm above 90°
Provides Glenohumeral stability for overhead work
Absorbs shocks to outstretched arms
what type of movement does the Scapulothoracic Joint permit? (6)
- Protraction – abduction away from the midline (spine)
- Retraction – adduction towards the midline (spine)
- Elevation (upward sliding on ribcage) towards ears
- Depression (downward sliding on ribcage) away from ears
- Rotation of scapula (reference is a glenoid cavity and inferior angle)
5a. Upward rotation – glenoid rotates superiorly, inferior angle rotates away from the midline
5b. Downward rotation – glenoid rotates inferiorly, inferior angle rotates towards the midline
what type of joint is the Sternoclavicular Joint
traditional synovial joint - modified saddle joint
The Articular Surfaces of the Sternoclavicular Joint include:
Facet on the medial end of the clavicle (aka acromial facet)
Facet on the manubrium of sternum
the articular disc of the sternoclavicular joint adds? Where is it located?
Protection and stability
Sits between the medial end of the clavicle and the sternum
- Additional fibro cartilaginous feature
- Only synovial connection of the upper limb to the axial skeleton, every other connection is with muscle
what are the three ligaments of the sternoclavicular joint
- Sternoclavicular ligament with capsule - reinforces joint capsule (front and back)
- Interclavicular ligament - reinforces the joint superiorly
- Costoclavicular ligament - anchors the medal end of the clavicle to the first rib
SC joint movements: elevation of the clavicle ROM
60
SC joint movements: depression of the clavicle ROM
5-10
SC joint movements: protraction and retraction ROM
25-30
SC joint movements: rotation of clavicle ROM
30
is there more ROM with elevation or depression of the clavicle? Why?
more with elevation, needed for inspiration
- when we exhale and it depresses - this is passive
With scapular protraction, the clavicle
retracts
With scapular retraction, the clavicle
protracts
The clavicle rotates __________ when you abduct
posteriorly
The clavicle rotates __________ when you adduct
anteriorly
Acromioclavicular joint (A/C Joint) Articular Surfaces
Facet on the lateral end of the clavicle (aka acromial facet)
Facet on the medial end of the acromion
type of Acromioclavicular joint (A/C Joint) and movement
plane synovial joint
movement: slide and glide
the AC joint only moves in response to what the ________ is doing
scapula
what are the three ligaments of the acromioclavicular joint?
- Acromioclavicular Ligament
- Trapezoid Ligament
- Conoid Ligament
A strong fibrous band that reinforces the superior aspect of the acromioclavicular joint
Acromioclavicular Ligament:
Extends from the coracoid process of the scapula to the trapezoid line on the inferior lateral end of the clavicle
Trapezoid Ligament:
Extends from the base of the coracoid process of the scapula to the conoid tubercle on the inferior aspect of the lateral clavicle
Conoid Ligament: