SpinalBioMech. Spinal Column

Question 1

L/S is subjected to ____ due to the lordortic curve

Answer 1

anterior shear force

Question 2

L/S anterior shear forces are due to ______

Answer 2

lordotic curve

Question 3

The anterior shear force is resisted by the ___ & ____

Answer 3

facet joints & deep erector spinae M.

Question 4

lumbosacral angle is ____ degrees

Answer 4

30 degrees

Question 5

*** structure and fxn of the SI joint changes significantly w/ ___&____

Answer 5

growth and development

Question 6

Who stays more flexible over life ? man vs female?

Answer 6

Female

also have hormone relaxin during preg

Question 7

____: withstands the compressive loads of the upper body in static & dynasmic situations

Answer 7

kinetics

Question 8

muscle compression increased _ ____loads

Answer 8

compressive loads

Question 9

compressive loads (decrease/increase) during walking

Answer 9

increase

Question 10

Motion of the SI jt is linked to motion at the _____

Answer 10

pubic symphysis

Question 11

the pubic symphysis is a ___ kinematic chain

Answer 11

closed

Question 12

smooth joint surfaces in SI jts allow ____motion in all ranges

Answer 12

gliding

Question 13

the SI joint _____ as we age

Answer 13

fuses

• develop furrows and grooves within the joint

Question 14

joint surfaces change after ____ & only allow slight translation / rotation

Answer 14

puberty

Question 15

___: sacral promontory (base) moves anterior & inferior while the coccyx moves posterior

Answer 15

nutation

Question 16

sacral nutation is the sacral promontory (base) moves ____ & ___ while the coccyx moved _____

Answer 16

base: anterior & inferior
Coccyx: posterior

Question 17

___ : sacral promontory moved posterior & superior while the coccyx moves anterior

Answer 17

sacral counter nutation

Question 18

sacral counter nutation : sacral promontory moves _ & ___ while he coccyx moves ____

Answer 18

Base: posterior & superior
coccyx: anterior

Question 19

____ theory: (classic) axis of tilt at the interosseous lig. , just posterior to the joint

Answer 19

Farabeuf’s theory

Question 20

Farabeuf’s theory: axis of tilt is at the _____

Answer 20

interosseous lig, just posterior to the joint

Question 21

______ theory: axis of tilt is at ____ tubercle, near the center of the joint

Answer 21

bonnaire’s theory

bonnaires tubercle

Question 22

__ theory: says no axis of tilt, pure translation

Answer 22

Weissels theory (1)

Question 23

__ theory: axis is in the pelvic bowl & varies from person to person

Answer 23

weissels theory (2)

Question 24

______ is extremely important for the SI joint support

Answer 24

stability

Question 25

_ loads of BW causes a nutation torque on the sacrum

Answer 25

compressive

Question 26

compressive loads of BW cause a nutation __ on the sacrum

Answer 26

torque

Question 27

ground reaction forces cause _ tilt forces on the ilia

Answer 27

posterior

Question 28

forces are resisted by ____ systems

Answer 28

ligament

Question 29

joint irregularities (suc as depressions/ridges) develop with age to help wth _____

Answer 29

stability

• by limiting motion

Question 30

___ structure resists shear forces during gait

Answer 30

pubic symphysis