Joint stability vs range of motion

Question 1

joint stability

Answer 1

ability of a joint to resist abnormal displacement of joints
-inversely proportional to ROM
-close packed position: joint orientation where contact is at a maximum (different for each joint)
-loose packed position: any orientation other than closed

Question 2

Factors that contribute to joint stability

Answer 2

Bony structure
ligaments
muscle tone/tension
fascia
atmospheric pressure

Question 3

Shape of bony structure

Answer 3

May refer to type of joint
-hinge, condyloid or ball and socket
or specific characteristics
-depth of joint socket

Question 4

ligaments in stability

Answer 4

strong, flexible, stress resistant, eleastic, that forms bands or cords around joints
-help maintain relationship of bones and normal range of motion
-resistant movements for which joint not designed

Question 5

Role of muscles

Answer 5

stabilize joint when bony structure contributes to stability
-subluxation
-joint pops out and goes back in

Question 6

Role of Fascia

Answer 6

consists of fibrous connective tissue
-IT band, plantar fascia, lumbar fascia

Question 7

Factors that influence joint ROM

Answer 7

Shape/contact area
restraining effect of ligaments
muscles and tendons

Question 8

Goniometer

Answer 8

axis placed directly over center of joint, one arm held stationary
-used measure degrees from starting position or anatomical position

Question 9

Active range of motion

Answer 9

measure with kinematics

Question 10

flexibility and injury

Answer 10

if more flexible, more injury
-decreased flexibility, with aging is primarily related to decreased physical activity