Basic biomechanics review Flashcards
Just a general review of key #s associated with biomechanics of the thoracic region.
What is the general shape of the vertebral body in thoracic region?
square, wedge-shaped vertically, 1-2 mm shorter in front
What is the kyphotic curve degree measurement in thoracic?
b/t 20-40 degrees
Which way to TPs point?
laterally and backwards.
What is the height of the IVD?
5 mm
body to disc ratio?
1:5
What does the low ratio decrease?
flexibility
What angle do the articular facets form?
60 degrees to horizontal plane. 20 degree to vertical
What field of plane are the articular facets in?
upper=coronal. thoraco-lumbar = more sagittal
What is there convexity/concavity?
flat
Which direction does the SA facet face?
posterolateral & superior
Which direction does the IA facet face?
anteromedial & inferior.
GROM lateral flexion?
20-40 degrees to each side
SROM lateral flexion?
average combined range - 6 degrees T1-T9; 8-9 degrees T10-T11
IAR lateral flexion?
CL Sup sub-adjacent vertebral body.
What movement is couple with Lateral flexion in the upper thoracics?
IL rotation - SPs rotate into convexity
Couple rotation of Lateral flexion in mid thoracics?
minimal couple rotation
Coupled rotation in lower thoracics with lateral flexion?
minimal coupled rotation to the CL direction. - SPs deviate to concavity
Which way do the articular facets glide in lateral flexion?
CL side = gaps. IL side = approximate.
GROM rotation ?
30-45 degrees to each side
SROM rotation?
uniform until lower 3-4 segments. Average combined range = 8-9 degrees T1-T10; 2 degrees T10-T11
IAR rotation?
CL center of corresponding vertebral body
Which way does lateral flexion occur with rotation in upper thoracics?
minimal lateral flexion to same side
Which way to the facets glide on the side of rotation?
inferior glide medially relative to superior facet below on the side of rotation.
