Assessing changes in three dimensional scoliotic deformities with difference maps.

D L Hill; D C Berg; T Church; V J Raso

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PubMed · 15457719

Assessing changes in three dimensional scoliotic deformities with difference maps.

D L Hill·D C Berg·T Church·V J Raso

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Abstract

Topographical difference maps were used to compare the trunk surfaces of subjects over the course of their treatment. Three-dimensional points representing the trunk surfaces were aligned accounting for growth and positioning. A goodness-of-fit score was calculated and a color map used to display trunk surface changes. Fifty-one successive subjects were assessed with difference maps. Two subjects each had 10 repetitions taken on the same day to assess reliability. A blinded observer used a five-point scale that extended from full agreement to full disagrment to judge the maps according to the extent and location of changes. The observations were compared to clinical measures mapped onto the same scale by another blinded observer. Goodness of fit for repeated measures averaged 5 +/- 1, for subjects deemed to have no change 7 +/- 2, for subjects with slight change 9 +/- 2, and 14 +/- 2 for subjects with significant change. Judges were in full agreement or in agreemnt with forty of the fifty-one subjects (78%) and in slight disagreement with the remaining eleven. When the cohort was subdivided in surgical, brace and no treatment groups, the judges were in full agreement or in agreement 76%, 80%, and 85% respectively. The difference map provides a qualitative and quantitative measure of how the trunk surface has changed as a whole.

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D L Hill, D C Berg, T Church, V J Raso. 2002. Assessing changes in three dimensional scoliotic deformities with difference maps.. https://pubmed.ncbi.nlm.nih.gov/15457719/

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