Is it possible to define reference values for radiographic parameters evaluating juvenile flatfoot deformity? A case-con
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(2020) 21:838
RESEARCH ARTICLE
Open Access
Is it possible to define reference values for radiographic parameters evaluating juvenile flatfoot deformity? A case-control study Johannes Hamel1†, Hubert Hörterer1,2† and Norbert Harrasser3*
Abstract Background: Numerous radiographic parameters are described to evaluate juvenile flexible flatfeet. Reference values for these measurements are based on few studies. The purpose of this study was to determine boundary values among the most widely used radiographic measurements to evaluate juvenile flatfeet. Methods: Twenty-two patients with normal hind-, midfoot configuration (group A: control group; 22 ft, mean age: 12,1 years) and 19 patients with flatfoot deformity (group B: study group; 22 ft, mean age: 12,4 years) were retrospectively analyzed. Nine radiographic parameters were measured (Talocalcaneal-angles, Calcaneal-pitch-angle, Costa-Bartani-angle, Talo-metatarsal-I-angles, Talo-first-metatarsal-base-angle, Talo-navicular-coverage, Calcaneusfifth-metatarsal-angle). ROC curve analysis was used to calculate optimal differentiating thresholds of each parameter. Results: Four out of nine parameters (TC-dp, TC-lat, Calc-MTV, Calc-P) were not statistically different between the groups and their ability to distinct between normal foot and flatfoot was low (AUC values = 0,660 - 0,819). Calculation of reference values for these parameters was not performed due to threshold ranges between the groups of > 10°. Reference values could be defined only for three parameters: TMTInd >(−)31°, TMTIB >(−)7,5°, TMTlat > (−)13,5°. The TMTInd was shown to be a very reliable and valid combination of two measurements (TMTIB and TMT-lat) in the differentiation of normal feet and flatfeet (AUC = 0,998). Conclusion: The calculation of reference values for established radiographic parameters used to evaluate juvenile flatfeet is difficult for most parameters. The TMTInd as a combination of TMTIB and TMT-lat has been shown to be reliable and valuable to distinct normal feet from flatfeet. Keywords: Pes planus, Flatfeet - Planovalgus deformity, Radiographic measurements, Talometatarsal index
* Correspondence: [email protected] † Johannes Hamel and Hubert Hörterer contributed equally to this work. 3 Department of Orthopedics and Sports Orthopedics, Technical University Munich, Klinikum rechts der Isar, Ismaninger Str. 22, 81675 Munich, Germany Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included
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