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Anatomic and MRI study of the subtalar ligamentous support

Étude anatomique et IRM du complexe ligamentaire sous-talien en position statique et en inversion

  • Radiologic Anatomy
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Summary

The diagnosis of subtalar instability remains difficult both clinically and radiographically. The authors present an anatomic and MRI study of the subtalar ligamentous support. The anatomic study has consisted in dissections and sections of cryoconserved hindfeet (15 cases) which precises the organisation of ligamentous bundles in the lateral (sinus tarsi) and central (canalis tarsi) subtalar compartments, mainly represented by the trilayered inferior extensor retinaculum, the cervical talo-calcaneal ligament and the interosseous talo-calcaneal ligament. MRI study (1.5 tesla) of anatomic specimens was performed according to defined types of sections: sagittal, coronal, coronal oblique, axial transverse. The correlations of anatomic and MRI sections allowed a precise interpretation of the subtalar ligamentous support as anatomically described. A complementary clinical MRI study was performed which allowed the validation of “the inversion test”: this test optimizes the visualization of the different ligamentous structures. Relative to the difficulties of conventional imaging procedures, MRI appears of clinical relevance in the diagnosis of subtalar instabilities. This technique allows direct visualization of ligaments (or their rupture) and therefore a better evaluation of subtalar involvement in ankle sprain. This paper present a functional concept in MRI articular ligamentous restraints concern.

Résumé

L'instabilité sous-talienne reste de diagnostic difficile tant cliniquement que radiographiquement. Les auteurs présentent une étude anatomique et par IRM du complexe ligamentaire sous-talien. L'étude anatomique, basée sur les dissections et coupes de 15 pieds précise l'organisation des différents faisceaux ligamentaires, répartis dans le compartiment latéral (sinus tarsi) et le compartiment central (canalis tarsi) et représentés par le retinaculum inférieur des extenseurs (formé de trois plans distincts), le ligament cervical talo-calcanéen, le ligament interosseux talo-calcanéen. L'étude IRM (1,5 tesla) a été réalisée selon différents plans de coupe : sagittal, coronal, coronal oblique, transverse. La corrélation des coupes anatomiques et IRM permet de retrouver avec précision les différents faisceaux ligamentaires décrits. Cette étude a été complétée par une étude IRM clinique qui a permis de valider le “test en inversion” qui optimise, pour toutes les coupes, la visualisation des structures ligamentaires. L'IRM apparaît très intéressante dans l'approche des instabilités soustaliennes en permettant une vision directe des faisceaux ligamentaires (ou leur éventuelle lésion) et plus généralement dans l'approche des instabilités de cheville qui peuvent associer des lésions ligamentaires tibio-tarsiennes et sous-taliennes. Ce travail introduit la notion d'IRM “fonctionnelle” qui semble pouvoir être développée dans le cadre de l'exploration des structures ligamentaires de stabilisation articulaire.

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Mabit, C., Boncoeur-Martel, M.P., Chaudruc, J.M. et al. Anatomic and MRI study of the subtalar ligamentous support. Surg Radiol Anat 19, 111–117 (1997). https://doi.org/10.1007/BF01628135

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  • DOI: https://doi.org/10.1007/BF01628135

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