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

Authors

  • Ryan Jasper Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0003-3448-1300
  • Hannah Stebral Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0003-2664-0762
  • Vineel Mallavarapu Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0002-8612-5941
  • Grayson Talaski Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0002-0018-6410
  • Eli Schmidt Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0002-6922-5238
  • Aly Fayed Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0002-3905-9662
  • Ki Chun Kim Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0002-3731-8448
  • Kepler Alencar Mendes de Carvalho Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0003-1082-6490
  • Nacime Salomão Barbachan Mansur Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA. https://orcid.org/0000-0003-1067-727X
  • César de César Netto Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.

DOI:

https://doi.org/10.30795/jfootankle.2022.v16.1677

Keywords:

Ankle joint, Foot deformities, Tomography, x-ray computed, Weight-bearing

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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Published

2022-12-20

How to Cite

Jasper, R., Stebral, H., Mallavarapu, V., Talaski, G. ., Schmidt, E., Fayed, A., Chun Kim, K., Alencar Mendes de Carvalho, K., Barbachan Mansur, N. S. ., & de César Netto, C. (2022). Foot and ankle offset in the setting of severe rotational foot and ankle deformities. Journal of the Foot & Ankle, 16(3), 215–221. https://doi.org/10.30795/jfootankle.2022.v16.1677