Posture Flashcards
3 controls of balance
1- Visual system (60%)
2- Vestibular system
3- Somatosensory system
When u fall backwards what do u need to flex
- ankle dorsiflexion
- hip flex
- ab flex
when u fall forwards what do u need to flex
- ankle plantarflex
- hip exten
- back muscular flex
how does tensiuon break bones
seperating of cement lines (transverse break)
how do vertebral compression fractures happen
Inside of verterral body, vertical trabeculae bow, transverse trabeculae are loaded in tension which result in breakage first
Where do u get maximal moment in a 4 point load
between the two middle loads
2 stages of torsion fracture
- shear first on outside
2. then crack forms along the plane of maximal tensile stress
in bending what makes a bone stronger
- crosss sectional area
2. amount of bone located away from the nutral axis
what makes somthing resistant to bending
height
what makes a bone resistant to tortion
cross sectional area
- bone being further from the neutral axis
hip swing lubercation
Hydrodynamic lubercation
orientation of outer and inner layer of cartilage
outer- densly packed arranged parallel to the surface
inner- perpendicular to the cartilage surface
cocktail party lubercation
boundry lubricuation
line of gravity in hip joint
post
line of gravity in sacroilliac joint and what apposes it
anterior
sacrotuberous lig
