hip part 3

Question 1

in symmetrical bilateral stance how much hip abductor muscle force is necessary to maintain equilibrium?

Answer 1

none

Question 2

what resists compression load at the hip?

Answer 2

hyaline cartilage, bone of femoral head, acetabulum, bending movement at neck of femur

Question 3

what is the actual joint reaction loads for unilateral stance?

Answer 3

2.5-3x BW

Question 4

what is the actual joint reaction loads for gait?

Answer 4

4x BW at early stance and 7x BW at late stance

Question 5

what is the actual joint reaction loads for stairs?

Answer 5

7x BW

Question 6

what are 3 different strategies for reducing hip reactive forces during weightbearing ADL’s?

Answer 6

ipsilateral trunk flexion
ipsilateral cane utilization
contralateral cane utilization

Question 7

rank the order of strategies for reducing hip reactive forces from most biomechanically sound way to decrease compression at the hip

Answer 7

1. ipsilateral trunk flexion
2. contralateral cane
3. ipsilateral cane

Question 8

what is the most optimal mathematical compensation at the hip?

Answer 8

ipsilateral trunk flexion

Question 9

what is the optimal cane use for compensation at the hip?

Answer 9

contralateral cane

Question 10

what effect does carried load intolerance on the contralateral side have on EMG of hip abductor muscles?

Answer 10

Increased force

Question 11

what effect does carried load intolerance on the ipsilateral side have on EMG of hip abductor muscles?

Answer 11

decreased force

Question 12

what patient population would we care about carried load intolerance for?

Answer 12

patients with hip OA or organic weakness of hip abductors or someone with lumbar radiculopathy

Question 13

in the frontal plane what determines if the muscle is an abductor?

Answer 13

lateral to the AOR

Question 14

in the frontal plane what determines if the muscle is an adductor?

Answer 14

medial to the AOR

Question 15

in the sagittal plane what determines if the muscle is a flexor?

Answer 15

anterior to AOR

Question 16

in the sagittal plane what determines if the muscle is a extensor?

Answer 16

posterior to AOR

Question 17

in the transverse plane what determines if the muscle is an external rotation?

Answer 17

posterior to AOR

Question 18

in the transverse plane what determines if the muscle is an internal rotation?

Answer 18

anterior to AOR

Question 19

why are runners sore on the medial aspects of their legs sometimes even though running is a frontal plane motion?

Answer 19

adductors get sore because they are active when the hip is already flexed as a hip extensor and when the hip is extended as a hip flexor