Biomechancis Of The Spine

Question 1

What are the maximum theoretical loads on vertebrae (compression)?

Answer 1

From 1300N C3 to 8000NL4

Question 2

Where does the body weight act in a normal standing position?

Answer 2

Anterior of the spine, creating a forward bending moment

Question 3

What happens to the IVD when leaning backwards?

Answer 3

Compression and anterior side and tension at posterior side

Question 4

What is the load on the spine when standing or sitting?

Answer 4

1.5-2 x body weight

Question 5

What is the load on the spine when walking ?

Answer 5

1.5-3 x body weight

Question 6

What is the maximum shear force from anterior to posterior?

Answer 6

20% of body weight

Question 7

What is the definition of a functional spinal unit?

Answer 7

IVD and the vertebrae either side and the interconnecting ligaments

Question 8

In degrees what is the range of lateral bending?

Answer 8

5-10 degrees

Question 9

In degrees what’s the axial rotation limit of the lower thoracic and lumbar spine?

Answer 9

3 degrees