TO THE EDITOR:
I wanted to point out what I believe is a math error in a recent JPO article, “An Alternative Approach To Scheuermann's Disease: A Case Study” (J Prosthet Orthot 2002;14:109-112).
In the Abstract, the authors point out that at the 14-month follow-up, “…out-of-brace correction was maintained at 27% of the original kyphosis.” In fact, I believe it should state: “…73% of the original kyphosis.” Twenty-seven percent of the original kyphosis would mean a follow-up curve magnitude of 19.17° (27% of 71 = 19.17).
The follow-up out-of-brace curve was 51°, or 73% of the original kyphosis. Another way to phrase it would be “…follow up correction was maintained at 51°, or a reduction of 27%.”
The article was well written and instructive, but I feel this line in the Abstract gives an incorrect impression of the efficacy of the results in this case study.
Mark F. Devens CO