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Shoulder Joint PCEFF

The shoulder joint complex consists of four joints: the sternoclavicular joint, acromioclavicular joint, scapulothoracic joint, and glenohumeral joint. The sternoclavicular and acromioclavicular joints are synovial plane joints, while the glenohumeral joint is a ball and socket joint. Together these joints allow for movement of the arm in multiple planes including elevation, depression, protraction, retraction, and rotation. Stability of the glenohumeral joint depends on the joint capsule, rotator cuff muscles, and ligaments like the coracohumeral and superior longitudinal ligaments. Coordination between the shoulder

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303 views38 pages

Shoulder Joint PCEFF

The shoulder joint complex consists of four joints: the sternoclavicular joint, acromioclavicular joint, scapulothoracic joint, and glenohumeral joint. The sternoclavicular and acromioclavicular joints are synovial plane joints, while the glenohumeral joint is a ball and socket joint. Together these joints allow for movement of the arm in multiple planes including elevation, depression, protraction, retraction, and rotation. Stability of the glenohumeral joint depends on the joint capsule, rotator cuff muscles, and ligaments like the coracohumeral and superior longitudinal ligaments. Coordination between the shoulder

Uploaded by

MaitryChheda
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Shoulder Joint

SC joint – Saddle Joint


AC joint – Plane synovial Joint
GH joint – Ball & Socket joint
ST joint – Not a true joint
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Sternoclavicular joint
• Consist of Intra-Articular Disc and Sternoclavicular ligament.
• Movements possible –
1. Elevation
2. Depression
3. Protraction
4. Retraction
5. Rotations – Anterior and Posterior

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Acromioclavicular joint

• Articulations – Acromion process of scapula and lateral end of clavicle


Major ligament – Acromioclavicular ligament and coracoclavicular ligament.
AC joint dislocation – Fall on tip of shoulder (medial-Inferior forces)
• Movements of the scapula by the lateral end of clavicle may include upward and
downward rotations, where scapula swings upward and outward, downward and
inward respectively.
• Movements of scapula against thorax includes internal and external rotations,
Anterior & posterior tilting.

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Scapulothoracic joint
• The joint separated by Subscapularis, Serratus
Anterior and Erector Spinae.
• Movements possible –
1. Elevation and Depression
2. Protraction and Retraction
3. Upwards and Downward Rotation

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Glenohumeral Joint
• Glenoid fossa – Anterior-lateral plane of scapula
• GH Joint stability –
1. GH Capsule
2. Long Head of Biceps
3. Rotator cuff muscles (Dynamic Stabilizers) – SITS
• Superior Longitudinal Ligament – prevents adduction
• Middle longitudinal ligament- prevents External rotation
• Inferior Longitudinal Ligament – Axillary pouch: gets taugh in 90 degrees of abduction,
external rotation
• Coracohumeral ligament - prevents adduction, inferior translation of humeral head and
external rotation

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Static Stability of Shoulder –
compression forces

• Superior capsular structures –


1. Superior capsular ligament
2. Coracohumeral ligament
3. Supraspinatus muscle
Rotator cuff muscles controlling Arthrokinematics of
Abduction
Supraspinatus – Drives the superior roll
Compresses the humeral head against glenoid fossa
Creates space above humeral head, to prevent
excessive translation of humerus
Infraspinatus, Teres Minor and Subscapularis
Exert a depression on humeral head
Infraspinatus and Teres Minor
Externally rotate the humerus.
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Shoulder joint complex
full abduction
• 2:1 Scapulohumeral rhythm
• Coordination of Sc and AC joint
• Clavicle retraction
• Posterior tilting and external rotation
of scapula
• Clavicle posterior rotation
• GH external rotation

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Primary muscles – Scapulothoracic joint
Elevators Retractors Downward Rot
Upper trapezius Middle trapezius Rhomboids
Levator Scapulae Rhomboids Pectoralis minor
Rhomboids Lower trapezius

Depressors Protractors
Lower trapezius Serratus anterior
Latissimus Dorsi Upwards Rotation
Pectoralis minor Serratus Anterior
Subclavius Upper and Lower trapezius
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Muscles Elevation of arm
• GH joint Muscles Rotator cuff muscles
Anterior and middle joint Supraspinatus
Supraspinatus Infraspinatus
Coracobrachialis Teres Minor
Biceps Subscapularis
ST joint
Serratus anterior
Trapezius

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Thank you
Happy Studying

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