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Upright Cone CT of the hindfoot: Comparison of the non-weight-bearing with the upright weight-bearing position

Hirschmann, Anna ; Pfirrmann, Christian ; Klammer, Georg ; Espinosa, Norman ; Buck, Florian

In: European Radiology, 2014, vol. 24, no. 3, p. 553-558

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    Titre
    • Upright Cone CT of the hindfoot: Comparison of the non-weight-bearing with the upright weight-bearing position
    Auteur
    • Hirschmann, Anna. Department of Radiology, Orthopaedic University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
    • Pfirrmann, Christian. Department of Radiology, Orthopaedic University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
    • Klammer, Georg. Department of Orthopedic Surgery, Orthopaedic University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
    • Espinosa, Norman. Department of Orthopedic Surgery, Orthopaedic University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
    • Buck, Florian. Department of Radiology, Orthopaedic University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • European Radiology, 2014, vol. 24, no. 3, p. 553-558. Springer Berlin Heidelberg
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325894
    Summary
    Objectives: To prospectively compare computed tomography (CT) of the hindfoot in the supine non-weight-bearing position (NWBCT) with upright weight-bearing position (WBCT). Methods: Institutional review board approval and informed consent of all patients were obtained. NWBCT and WBCT scans of the ankle were obtained in 22 patients (mean age, 46.0 ± 17.1years; range 19-75years) using a conventional 64-row CT for NWBCT and a novel cone-beam CT for WBCT. Two musculoskeletal radiologists independently performed the following measurements: the hindfoot alignment angle, fibulocalcaneal and tibiocalcaneal distances, lateral talocalcaneal joint space width, talocalcaneal overlap and naviculocalcaneal distance. Significant changes between NWBCT and WBCT were sought using Wilcoxon signed-rank test. P values <0.05 were considered statistically significant. Results: Significant differences were found for all measurements except the hindfoot alignment angle and tibiocalcaneal distance. Significant measurement results were as follows (NWBCT/WBCT reader 1; NWBCT/WBCT reader 2, mean ± standard deviation): fibulocalcaneal distance 3.6mm ± 5.2/0.3mm ± 6.0 (P = 0.006); 1.4mm ± 6.3/-1.1mm ± 6.3 (P = 0.002), lateral talocalcaneal joint space width 2.9mm ± 1.7/2.2mm ± 1.1 (P = 0.005); 3.4mm ± 1.9/2.4mm ± 1.3 (P = 0.001), talocalcaneal overlap 4.1mm ± 3.9/1.4mm ± 3.9 (P = 0.001); 4.5mm ± 4.3/1.4mm ± 3.7 (P < 0.001) and naviculocalcaneal distance 13.5mm ± 4.0/15.3mm ± 4.7 (P = 0.037); 14.0mm ± 4.4/15.7mm ± 6.2 (P = 0.100). Interreader agreement was good to excellent (ICC 0.48-0.94). Conclusion: Alignment of the hindfoot significantly changes in the upright weight-bearing CT position. Differences can be visualised and measured using WBCT. Key Points : • Cone-beam computed tomography (CBCT) offers new opportunities for musculoskeletal problems • Visualization and quantification of hindfoot alignment are possible in upright weight-bearing CBCT • Hindfoot alignment changes significantly from non-weight-bearing to weight-bearing CT • The weight-bearing position leads to a decrease in the fibulocalcaneal distance and talocalcaneal overlap • The naviculocalcaneal distance is increased in the weight-bearing position