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Foot and ankle offset in the setting of severe rotational foot and ankle deformities
Journal article   Open access   Peer reviewed

Foot and ankle offset in the setting of severe rotational foot and ankle deformities

Ryan Jasper, Hannah Stebral, Vineel Mallavarapu, Grayson Talaski, Eli Schmidt, Aly Fayed, Ki Chun Kim, Kepler Alencar Mendes de Carvalho, Nacime Salomão Barbachan Mansur and César De César Netto
Journal of the Foot & Ankle, Vol.16(3), pp.215-221
12/20/2022
DOI: 10.30795/jfootankle.2022.v16.1677
url
https://doi.org/10.30795/jfootankle.2022.v16.1677View
Published (Version of record) Open Access

Abstract

Objective: The goal of this paper was to evaluate the validity of foot and ankle offset (FAO) measurements in the setting of severe foot and ankle deformities. Methods: This study included 57 feet (36 patients) that had a history of severe cavovarus deformity. Each participant received a weight-bearing computed tomography (WBCT) scan that was then used to measure FAO. This measurement was performed once using the traditional measurement technique and two additional times using a modified technique that allows for rotational correction of the images to align the talus. Results: Traditional FAO (TFAO) and modified FAO (MFAO) were found to have a significant correlation with one another (r (54)=0.92, p<0.001). There was a high positive correlation between the variables of the two techniques (r=0.92) with the intraobserver reliabilities (ICC=0.95) for FAO measurements. The agreement between TFAO and Modified foot and ankle offset (MFAO) measurements was also considered excellent (ICC=0.99). Conclusion: The MFAO method provides statistically similar FAO measurements compared to the TFAO method in this population. Thus, the TFAO method could potentially expand its patient population to provide surgeons with a reliable tool for assessing more severe deformities. Level of Evidence IV; Retrospective Study.

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