Three-dimensional displacement after a medializing calcaneal osteotomy in relation to the osteotomy angle and hindfoot alignment

M. Peiffer, Claudio Belvedere, S. Clockaerts, T. Leenders, Alberto Leardini, E. Audenaert, J. Victor, A. Burssens

Research output: Contribution to journalArticlepeer-review

Abstract

Background: A medializing calcaneal osteotomy is frequently performed to correct adult-acquired flatfoot deformities, but there is lack of data on the associated three-dimensional variables defining the final correction. The aim of this study was to assess the correlation between the pre-operative hindfoot valgus deformity and calcaneal osteotomy angles and the post-operative calcaneal displacement. Methods: Weight-bearing CT scans obtained pre- and post-operatively were retrospectively analyzed for sixteen patients. Corresponding three-dimensional bone models were used to measure valgus deformity pre- and post-operatively, inclination of the osteotomy and displacement of the calcaneus. Linear regression was conducted to assess the relationship between these measurements. Results: On average, the hindfoot valgus changed from 13.1° (±4.6) pre-operatively to 5.7° (±4.3) post-operatively. A mean inferior displacement of 3.2 mm (±1.3) was observed along the osteotomy with a mean inclination of 54.6° (±5.6), 80.5° (±10.7), −13.7° (±15.7) in the axial, sagittal and coronal planes, respectively. A statistically significant positive relationship (p <.05, R2 = 0.6) was found between the pre-operative valgus, the axial osteotomy inclination, and the inferior displacement. Conclusions: This study shows that the degree of pre-operative hindfoot valgus and the axial osteotomy angle are predictive factors for the amount of post-operative inferior displacement of the calcaneus. These findings demonstrate the added value of a computer-based pre-operative planning in clinical practice. Level of evidence II Prospective comparative study.

Original languageEnglish
JournalFoot and Ankle Surgery
DOIs
Publication statusE-pub ahead of print - Dec 7 2018

Keywords

  • Adult-acquired flatfoot deformity
  • Computer-aided design
  • Hindfoot alignment
  • Medializing calcaneal osteotomy
  • Weight-bearing CT

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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