Question

lumbar sagittal plane rotation is coupled with ____ sagittal plane translation. translation over ____ would suggest clinical joint instability.

a) 3-4 mm, 4.5 mm
b) 2-3 mm, 5 mm
c) 3-4 mm, 5 mm
d) 2-3 mm, 4.5 mm

Explanation:

In lumbar spine biomechanics, sagittal - plane rotation is coupled with 3 - 4 mm sagittal - plane translation, and translation over 4.5 mm suggests clinical joint instability.

Answer:

A. 3-4 mm, 4.5 mm