HUBS1105 Lecture Notes - Lecture 7: Glenoid Labrum, Shoulder Joint, Ball Joint

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4 May 2018

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HUBS1105(

7.(Glenohumeral(Joint(Structure(

(

Shoulder)

− Synovial,(ball(and(socket(or(spherical(joint(

− Multiaxial;(dislocation(is(common(

− Glenoid(fossa(made(more(congruent(due(to(ring(of(cartilage(–(glenoid(labrum(

− Head(of(humerus(articulates(with(glenoid(labrum(

− Fibrous(capsule(fused(with(rotator(cuff(muscle(tendons(allowing(large(range(of(movement(

)

Shoulder)Dislocation)

− Extreme(force(or(rotation(

− Usually(in(position(of(extension,(abduction(and(lateral(rotation(

Glenohumeral)Joint)

− Movements:(flexion,(extension,(adduction,(abduction,(rotation,(circumduction(

− Stability:(increased(mobility(meaning(less(stability(

Scapulohumeral)Rhythm)

− Scapula(:(humerus(move(in(1:2(ratio(

− Arm(abducted(180(degrees(–(60(degree(rotation(of(scapula(and(120(degree(rotation(by(glenohumeral(joint(

(

( (

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