Week 8 Flashcards
What is the most common means of assessing spinal curvature
Cobb angle
Normal curvature of the thoracic spine
20-50 degrees
Normal curvature of the lumbar spine
20-70 degrees
What is the stability of the spinal column provided by
extrinsic and intrinsic structures and factors
what are the 3 functional components of the intervertebral conjunction
transverse & spinous processes apophyseal joint interbody joint(intervertebral disc)
What are the transverse and spinous processes used for
they are levers that increase mechanical leverage of muscles and ligaments
What does the intervertebral joint do
absorbs and distributes loads
adhesion between vertebrae
what happens to the spine as we age
Intervertebral disc dehydrates & undergoes fibroses
- alters spinal load in the body
facet joints undergoes OA changes
ligaments / capsules & muscles also age
what is spinal coupling
movement in one plane associated with an automatic movement in another
e.g. Rotation and translation (at the same time)
Thoracic spine
most mechanically stable portion of the vertebral column (excluding SIJ)
When determining Lx ROM, need to consider
lumbopelvic rhythm
impact of pelvic tilt
sitting posture
what is lumbopelvic rhythm
Trunk flexion - bending forward, knees straight
combo of approx. 40 degrees Lx flexion and 70 degr hip flexion
extension from full flexion, knees straight
What is the SIJ joint
transition between caudal end of skeleton + lower appendicular skeleton
Form closure SIJ
anatomic features
closely fitting joint surfaces - create friction to reduce shear
ideally no external force needed
results in minimal movement
Force closure SIJ
muscles and ligaments
compression of joint surfaces
prevents shear
nutation & counternutation important
