Patent ID: 9265463
Filing Date: 2016-02-23
CPC Classification: A61B,G16H

Claim Text:
1. A method for calculating a spinal translation per degree of rotation (TPDR) comprising: obtaining an x-ray film of a first and a second vertebrae in a first position; obtaining an x-ray film of a first and second vertebrae in a second position, wherein the degree of intervertebral rotation between the two positions is greater than 3 degrees; marking the position of at least one landmark on the first vertebra on the x-ray film of the first position; superimposing the two x-ray films and aligning the first vertebra and then determining the rotation and translation required to subsequently align the second vertebra; measuring the degree of vertebral rotation between the first and second vertebrae in the first and second positions; measuring the translation of the landmark on the first vertebra between the first and second positions while holding the second vertebra fixed; normalizing the intervertebral translation measurement based upon a vertebral dimension; dividing the normalized intervertebral translation by the intervertebral rotation to give a TPDR.