Dr Rania Gabr Dr Samaulhaq.

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Anatomy of Shoulder Part 2

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Presentation transcript:

Dr Rania Gabr Dr Samaulhaq

Objectives Understand the formation of the shoulder joint and its type. Explain the structures related to the shoulder joint. Name the movements taking place on shoulder joint. Define shoulder joint dislocation and subluxation.

Shoulder joint Articulation : Type: Synovial ball and socket head of the humerus glenoid cavity of the scapula. Type: Synovial ball and socket

Capsule and ligaments of the Shoulder Joint Glenohumeral Ligament Transverse humeral Ligament Coracohumeral Ligament Coracoacromial Ligament

Capsule Surrounds joint and attached Medially to the scapula beyond the supraglenoid tubercle and the margins of the labrum. Laterally to the anatomical neck of humerus. Thin and lax, allow wide range of movement. Capsule Strengthened by slips of tendons of subscapularis m., supraspinatus m., infraspinatus m. & teres minor (rotator cuff muscles).

Bursa: a closed sac or envelope, lined with synovium Subdeltoid / Subacromial bursa. Deltoid Sub Acromial Bursa Subdeltoid Bursa Subscapularis Bursa: a closed sac or envelope, lined with synovium and containing fluid, usually in areas subject to friction.

BURSAE IN RELATION TO SHOULDER JOINT They reduce friction between tendons, joint capsule & bone. They are liable to be inflammed following injury of rotator cuff muscles. Subscapularis bursa: between subscapularis tendon & capsule. Infraspinatus bursa: between infraspinatus tendon & capsule. Subacromial bursa: between deltoid, supraspinatus and capsule. 3 1 2

Capsule and ligaments of the Shoulder Joint

Stability NOT STABLE DUE TO: Head of humerus is 3 times larger than glenoid cavity Capsule is redundant. Little ligamentous support. Wide range of movement (it is the most mobile joint of the human body) Main support: muscles around the joint (ROTATOR CUFF)

Movement of the Shoulder Joint

Clinical anatomy of the Shoulder Joint Dislocation: commonly dislocated due to it’s freedom of movement and instability. Most common site of dislocation is inferior. Cause: fall on shoulder-excessive extension and lateral rotation of shoulder. Subluxation: A lesser degree of displacement. Fracture: Fracture is a break in the structural continuity of bone.

A. Subluxation B. Partial dislocation C. Complete dislocation Subluxation (A) Partial dislocation (B) Complete dislocation ©

Dislocation of shoulder joint