biomech final

Question 1

torque

Answer 1

muscle contraction causes rotational force vector at the joint

Question 2

moment

Answer 2

bending force vector

Question 3

when is max tension produced

Answer 3

rest length

Question 4

what is the production at 60% resting length?

Answer 4

0

Question 5

thrixotrophy

Answer 5

reduction of the viscosity of a fluid following movementd

Question 6

spasm

Answer 6

involuntary contraction

Question 7

spasticity

Answer 7

CNS lesion causing muscle to spasm

Question 8

3 ways to eval muscle tone

Answer 8

1)digital pressure 2) estimated ROM 3) flapping test

Question 9

stability at end range?

Answer 9

ligaments

Question 10

how does the lig flavum help support the spine

Answer 10

creates intradiscal pressure and stiffness

Question 11

does compression cause herniation?

Answer 11

no, even with loads sufficient to cause deformation

Question 12

flextion stresses

Answer 12

post fibers

Question 13

ext stresses

Answer 13

ant fibers

Question 14

what does internal disk derangement cause

Answer 14

LBP (most common source) and reffered leg pain ** no nerve damage

Question 15

what way will the NP normally move to?

Answer 15

post

Question 16

mm that create core stability

Answer 16

transverse abdomnis, internal obliques and multifidi

Question 17

mm responsible for IAP

Answer 17

Transverse abdomnis

Question 18

what does tight hamstrings cause for the low back

Answer 18

lumbar to bear more load in flexion

Question 19

where does the first 50-60% of flexion occur

Answer 19

lumbar

Question 20

what happens at full flexion

Answer 20

erector spinae=inactive; deep ext and multifidi are still active as we hang on ligs

Question 21

right rot opens

Answer 21

right facets

Question 22

what is the oblique dorsal sling comprised of

Answer 22

thoracolumbar fascia and contalateral glut

Question 23

mm of the force couple stabilization

Answer 23

lats and glut max

Question 24

epinerium

Answer 24

superficial, blood supply

Question 25

perinerium

Answer 25

biochemical barrier

Question 26

endonerium

Answer 26

inside fascicles

Question 27

endoneural fluid pressure

Answer 27

increased pressure can disrupt microcirculation and affect nerve function

Question 28

tensile load of a n

Answer 28

previously injured nerve will lose some of mechanical tensile strength

Question 29

acute compression of s nerve usually causes

Answer 29

numbness, weakness, parathesia NOT PAIN

Question 30

what nerve fibers are compressed prior to pain

Answer 30

motor and vibration

Question 31

how much of IVD is taken up by the nerve root

Answer 31

35-50%

Question 32

cervical spine flexion

Answer 32

inc IVF size increses NR tension

Question 33

c spine ext

Answer 33

dec IVF

Question 34

left rotation c spine

Answer 34

inc right IVF and dec left IVF

Question 35

s/sx of central compression

Answer 35

bilat sx

Question 36

axial compression of c spine in an rear end

Answer 36

50% less stiffness of C spine = less able to resist flex/ext forces= c spine weaker

Question 37

IAR def

Answer 37

motion of a body can be assumed to be pure rotation around that line at that instant

Question 38

when deep flexors are inactive you get what instability?

Answer 38

functional

Question 39

sprains of ALL

Answer 39

structural

Question 40

most common lesions of whiplash

Answer 40

avulsion of disk from endplate and tears of annulus

Question 41

disc injuries most common at

Answer 41

c4-c5 and c6-c7

Question 42

are posterior disc herniations w NR root compressio common?

Answer 42

no

Question 43

what is chronic whiplash related to?

Answer 43

facets