Sternoclavicular Joint

• Saddle joint between clavicle an sternum

• Functions as a ball-and-socket joint

• Extremely strong, but very mobile

Sternoclavicular Joint: Movement

• Elevation of clavicle (and scapula)
• Protraction and retraction
• Some rotation

Sternoclavicular Joint: Reinforcement

• Articular Disc
• Anterior/Posterior Sternoclavicular Ligament
• Interclavicular Ligament
• Costoclavicular Ligament

Acromioclavicular Joint

• Planar Joint between Clavicle and Scapula

• Strengthened by Trapezius muscle

Acromioclavicular Joint: Movement

• Small amount of movement in superioferior and anteroposterior

• Abduction/Addction

• Translation (the joint can wiggle)

Acromioclavicular Joint: Reinforcement

• Acromioclavicular Ligament

• Coracoacromial Ligament                (Trapezoid and Conoid Ligaments)

Glenohumeral Joint (Shouldar)

• Ball-and-Socket Joint between Humerus and Scapula
• Most mobile joint in the body
• attached by Coracohumeral and Capsular ligament

Glenohumeral Joint: Movement

• Abduction/Adduction
• Flexion/Extension
• Medial/Lateral Rotation

Glenohumeral Joint: Reinforcement

• Tendons of the Rotator Cuff muscles
• Tendon of the Long Head of Biceps Brachii
• Coracoacromial Ligament
• Glenoid Labrum

Tendons of the Rotator Cuff Muscle

• Supraspinatus Tendon
• Infraspinatus Tendon
• Teres Minor Tendon
• Subscapularis Tendon

• Passes through Synovial Cavity
• Held in place by Transverse Ligament spanning between Greater and Lesser Tubercles