ARTICULAR STABILITY HIGH YIELDS

Question 1

T/F, the foot generally has no acceleration when in contact with the ground?

Answer 1

T

Question 2

when does the foot have acceleration?

Answer 2

during initial contact and final propulsion off ground

Question 3

bones are the levers which are rotated about an axis by means of what forces?

Answer 3

muscles and external forces

Question 4

so in effort,part of the lever system, the vector is always the _____?

Answer 4

muscle

Question 5

all muscle operate on what principle?

Answer 5

lever principle

Question 6

for skeletal stability in relation to static stance, what is required?

Answer 6

momentary muscle contraction to re-establish osseous position and relieve tension on ligaments

Question 7

what must be maintained during gait?

Answer 7

osseous stability to limit motion and joints must move only within their normal planes

Question 8

what is the effect of abnormal motion?

Answer 8

when a joint moves too much or in a direction outside its plane of motion

results in hyper mobility and instability

Question 9

what can cause momentary subluxation?

Answer 9

hypermobility

Question 10

small amounts of force result in _____?

Answer 10

osseous instability

Question 11

what are the two forces that act on weight bearing bones?

Answer 11

compression force

rotational force

Question 12

what happens when angulation of forces at a joint is small? large?

Answer 12

compression is achieved

less joint compression and more rotational force, creating instability; muscle activity helps keep this low increasing stability