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Synovial Joint >>
Joint Mobility >>
affecting factors |
position |
Joints Stability
Factors affecting joint stability
configuration of the bone
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medial longitudinal arch |
components of ligament¡G
depending on proportion of different types of fibers in ligament
collagen fibers¡G
for strength
94% of the anterior cruciate ligament of the knee is composed of collagen fibers
60% of the ligamentum of flavum are elastin fibers
elastin fibers¡G for flexibility
rectin fibers¡G for mass
muscular arrangement
fascia and skin
atmosphere pressure
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Position of a joint
rest position
definition¡Gthe position where is the least congruent position, resulting in the
greatest mechanical mobility for that joint
example¡G for the glenohumeral joint the rest position is abduction of 70º and flexion of 30º
close-packed position
definition¡G the position that both of the articular surfaces are in the maximum congruency status for a joint,
resulting in the greatest mechanical stability for that joint
In the close-packed position, most ligaments and capsules surrounding to the joint are taut
example¡G for the glenohumeral joint the close-packed position is abduction of 90º and full external rotation
loose-packed position¡G
all positions other than close-packed position
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