Joint Mobs 300: Glenohumeral Joint Flashcards
Approximately degrees of motion and must occur at the shoulder complex for most functional activities to occur.
120 degrees, flexion, abduction
What makes up the Shoulder Complex?
Glenohumeral, Sucapulothoracic, Acromioclavicular, Sternoclavicular
Glenohumeral jt. Classification is….
Structure: synovial
Function: diarthrotic
Subtype: ball-and-socket
Axis of rotation: multiaxial
Osteokinematic motions
Flexion: 180 Extension: 45 Abduction: 180 Addiction: 45 Medial rotation: 70 Lateral rotation: 90 Horizontal addiction: 45 Horizontal Abduction: 100
Circumduction is a combination
Articular surfaces are
Scapula: glenoid fossa (concave)
Humeral: humeral head (convex)
Improved fit by glenoid labrum ( narrow rim of fibrocartilage)
: like a golf tee and ball
Qualities of shoulder capsule
Capsular strength: weak
Capsule: is thin and lax allows for wide ROM- strengthened by tendons of subscapularis, supraspinatus, infraspinatus, and teres minor.
Inferior folds present when shoulder is in anatomical position, unfold as shoulder elevates.
Shoulder is immobilized in adduction ( often these folds adhere to one another)
Ligaments for shoulder (3)
Glenohumeral lig.
Coracohhumeral lig.
Transverse humeral lig.
- (coracoacromila lig is considered an accessory ligament.)
Glenohumeral ligament is…
Superior, inferior, middle,
3 weak bands of fibrous tissue strengthen front of capsule
Coracohumeral ligament…
Strengthens capsule above
stretches from root of coracoid process to the greater tuberosity of the humerus
Transverse humeral ligament…
Strengthens the capsule and bridge the gap between tuberosities ( greater and lesser) of humerus
Bursae (4)
Subscapular
Subdeltoid
Subacromial
Subcoracoid
Nerve inervations
Suprascapular nerve
Axillary nerve
lateral pectoral nerve
Blood inervation
Branches of axillary and subclavian arteries
Muscles associated
tendons of rotator cuff mm Deltoideii Biceps brachii Long head of triceps Pectoralis major Teres major Latissimus dorsi Coracobrachialis
Pathology and trauma to shoulder…
Anterior dislocation m/c
- weakness of jt. Capsule
- Progressive ligamentous laxity and damaged to glenoid labrum cause recurrent dislocations
Rotator cuff injury
Due to rigorous or ballistic circumduction involving supraspinatus tendon
May progress from chronic tendonitis to clacific tendonsitis and bursitis
Adhesive Capsulitis
Frozen shoulder
Idiopathic
F>M
Resting position ( most loose pack) at Glenohumeral jt
55-70 abduction
30 horizontal adduction
Neutral rotation
( kinda like reaching out for a hand shake)
Closed-pack position at Glenohumeral jt.
Full elevation
- maximum combined abduction and external rotation
Capsular pattern ( of restriction) at Glenohumeral jt.
Lateral rotation more limited than abduction which is more limited than medial rotation
What are the joint mobs done for Glenohumeral jt?
To increase ABD- inf glide, sup roll (supine)
To increase Flex, internal rot.- post glide, ant roll (supine)
To increase Ext, ext rot. Hor. ABD - ant glide, post roll (supine/ prone)