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Characterization of a bipartite medial cuneiform: micro-CT and anatomical study / Caracterización de un cuneiforme medial bipartito: micro-CT y estudio anatómico
Dalmau-Pastor, Miki; Vega, Jordi; Baltasar-Sánchez, Alicia; Slimani, Lotfi; Belinha, Jorge; González-Sistal, Ángel; Manzanares, M. C.
  • Dalmau-Pastor, Miki; University of Barcelona. School of Medicine. Department of Pathology and Experimental Therapeutics. Barcelona. ES
  • Vega, Jordi; University of Barcelona. School of Medicine. Department of Pathology and Experimental Therapeutics. Barcelona. ES
  • Baltasar-Sánchez, Alicia; University of Barcelona. School of Medicine. Medical Imaging Lab. Barcelona. ES
  • Slimani, Lotfi; Paris Descartes University. Dental school & Life Imaging Facility. Laboratory Orofacial Pathologies, Imaging and Biotherapies. Paris. FR
  • Belinha, Jorge; University of Porto. Faculty of Engineering. Department of Mechanical Engineering. PT
  • González-Sistal, Ángel; University of Barcelona. School of Medicine. Medical Imaging Lab. Barcelona. ES
  • Manzanares, M. C; University of Barcelona. School of Medicine. Department of Pathology and Experimental Therapeutics. Barcelona. ES
Int. j. morphol ; 36(4): 1372-1377, Dec. 2018. tab, graf
Article in English | LILACS | ID: biblio-975711
ABSTRACT
A bipartite medial cuneiform is an anatomical variant consisting in a horizontal division of the bone. Previous descriptions of the joint type, obtained from archaeological material or clinical reports, are unclear. This study was conducted in a fresh-frozen left foot, which allowed studying the morphology of the ligaments after anatomical dissection. In addition a Micro-CT analysis was performed to elucidate the osseous structure supporting the articular surfaces. A complex ligamentous system was found between the two halves of the bipartite medial cuneiform. Two articular surfaces were observed between the two components. Hyaline cartilage was observed at the posterior surface, while fibrous tissue was found at the anterior surface. Micro-CT analysis revealed different osseous structures for each articular surface, thus proving the existence of two joint types. The finding of a bipartite medial cuneiform in a fresh-frozen specimen allowed us to perform an analysis of the soft-tissues and articular surfaces that shows the presence of hyaline cartilage and articular ligaments in the diarthrodial joint as well as the fibrous component of the synfibrosis. Micro-CT analysis further reinforces our morphological findings. Our results prove that two different joint types exist, which could help explaining the disparity of descriptions in the literature.
RESUMEN
El cuneiforme medial bipartito es una variación anatómica que consiste en una división horizontal del hueso. Las descripciones previas del tipo de articulación entre los dos fragmentos, obtenidas de material arqueológico o de reportes clínicos, son heterogéneas. Este estudio se llevó a cabo en un pie izquierdo disecado en fresco, lo que permitió analizar la morfología de los ligamentos. Adicionalmente se llevó a cabo un análisis con Micro-CT a fin de aclarar la estructura ósea de soporte de las superficies articulares. Un sistema ligamentoso complejo une las dos mitades del cuneiforme medial bipartito. Se observaron dos superficies articulares uniendo ambos componentes. En la superficie posterior se encontró cartílago hialino, en tanto que la superficie anterior presentaba tejido fibroso uniendo las superficies articulares. El análisis por Micro-CT mostró que la estructura ósea de soporte de cada una de las superficies articulares es diferente, confirmando la existencia de dos articulaciones distintas. El hallazgo de un cuneiforme medial bipartito en un espécimen fresco ha permitido el estudio de las partes blandas y superficies articulares, demostrando la presencia simultánea del cartílago hialino y los ligamentos propios de una diartrosis y del tejido fibroso propio de una sinfibrosis, lo que ha sido posteriormente corroborado por el análisis por Micro-CT. Nuestros resultados demuestran por tanto que se trata de dos articulaciones distintas, lo cual explica la disparidad de las descripciones en la literatura.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Tarsal Bones / X-Ray Microtomography Limits: Aged / Humans / Male Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2018 Type: Article Affiliation country: France / Portugal / Spain Institution/Affiliation country: Paris Descartes University/FR / University of Barcelona/ES / University of Porto/PT

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Full text: Available Index: LILACS (Americas) Main subject: Tarsal Bones / X-Ray Microtomography Limits: Aged / Humans / Male Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2018 Type: Article Affiliation country: France / Portugal / Spain Institution/Affiliation country: Paris Descartes University/FR / University of Barcelona/ES / University of Porto/PT