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