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Chptr 6 Joint Classification
Terms in this set (7)
3 structural classifications of joints are
fibrous, cartilaginous & synovial
Joints allow movement
Muscles create movement
Liament/joint capsules limit movement
Closed packed joint position (locked joint)
the position in which the joint is most stable. The stable, closed-packed position of a joint is usually the result of a combination of the position of the bones such that they are maximally congruent ( their articular surfaces best fit each other) and the ligaments are most taut. These 2 factors result in a position that restricts motion and therefore increases stability.
Open packed joint position (open joint)
the congruent fit of the bones is poor and te ogaments are lax, resulting in greater mobility.
the more massive a muscle is, the more stability it lends to the joint. However, this greater stability also means less mobility.
If the baseline tone of the musculature that crosses a joint is high (tight muscle), stability increases even more and mobility decreases commensurately.
Shoulder and hip joints
both are ball and socket joints. however the shoulder joint is more mobile and less stable, and the hip joint is more stable and less mobile. 3 reasons:
1) glenoid fossa is much shallower than the socket of the hip joint
2) ligament/joint capsule complex of the shoulder is much looser than the hip joint
3) Muscles crossing the shoulder joint are less massive than the muscles crossing the hip joint
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