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Biomechanics of Shoulder
complex
Dr. Vivek Kumar Shrivastava
Asso. Prof
LNCT University
Bhopal
Introduction
Shoulder Complex (4 Articulations)
•Glenohumeral Articulation
•Acromioclavicular Articulation
•Sternoclavicular Articulation
•Scapulothoracic Articulation
Shoulder Complex (4 Articulations)
Kinematics of Shoulder Complex
• ROM of Shoulder Complex
• Flexion / Extension
• Adduction / Abduction
• Internal / External rotation
• Scaption
Sternoclavicular Junction
• Medial End of Clavicle and Superior lateral aspect of Manubrium
Sternoclavicular Joint Motion
• Rotation
• Elevation / Depression
• Protraction / Retraction
• Anterior / Posterior Rotation (50 / 10 Degree)
• Translation
• Superior / Inferior
• Anterior / Posterior
• Medial / Lateral
Acromioclavicular Joint
• Lateral end of Clavicle and
Acromion process of Scapula
forms the Acromioclavicular
Joint Which is a Synovial Joint
• Ligaments-
• Coracoacromial Ligament
• Acromioclavicular Ligament
• Coracoclavicular Ligament
Movements of AC Joint
• Rotation-
• Anterior / Posterior rotation
• Anterior / Posterior Tipping
• Upward / Downward Rotation
• Glides
• Anterior / Posterior
• Superior / Inferior
• Medial / Lateral
Role of Clavicle in Shoulder Joint Movement
• For every 100 of Shoulder Elevation 40 of Clavicle rotation is noted
Glenohumeral Joint
• Humeral head articulates with
Scapular Glenoid Fossa to form
Glenohumeral Joint
Anatomical Consideration of Proximal
Humerus
Glenoid Labrum
Glenohumeral & Coracohumeral Ligaments
• Glenohumeral Ligament
• Superior GH Ligament
• Middle GH Ligament
• Inferior GH Ligament
Glenohumeral Movements
Scapulothoracic Articulation
Movement of Scapula
• Upward Rotation (600)
• Elevation / Depression
• Protraction / Retraction
Movement of Scapula
Scapulohumeral Rhythm
• Full ROM of Shoulder joint is combination of All four joint, especially
Glenohumeral joint and Scapulothoracic joint
• GH Joint : ST Joint = 2:1
• For Every 20 of Shoulder Flexion or Abduction Scapula rotates 10
• Full ROM of Shoulder Joint 1800 = GH Joint 1200 + ST Joint 600
• 600 of ST joint Upward rotation = 300 SC Elevation + 300 AC Upward
Rotation
Kinetics Of
Shoulder Joint
Deltoid
Rotator Cuff Muscles
Pectoralis Major
Biceps
Trapezius
Latissimus Dorsi
Levator Scapulae
Rhomboids