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An analysis of the function of the posterior talofibular ligament

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Summary

The function of the posterior talofibular ligament was studied using an apparatus which subjected the ankle joint to a measured torque and allowed the simultaneous recording of rotatory movements in two planes. Thirty osteoligamentous preparations of ankle joints were examined, half in the sagittal and horizontal planes and the remainder in the sagittal and frontal planes.

Successive section of the lateral collateral ligaments was performed, including, in particular, selective division of the short and long fibres of the posterior talofibular ligament. The function of this ligament was investigated in combination with the other two collateral lateral ligaments, with the calcaneofibular ligament alone, and finally as the only remaining intact ligament.

The posterior talofibular ligament plays only a supplementary role in ankle stability when the lateral ligament complex is intact. After rupture of the anterior talofibular and the calcaneofibular ligaments, however, the short fibres of the posterior ligament restrict internal and external rotation, talar tilt, and dorsiflexion, while its long fibres inhibit only exernal rotation, talar tilt, and dorsiflexion. As the posterior talofibular ligament has no independent stabilizing function in the intact ankle joint, an isolated rupture of this ligament is unlikely.

Résumé

La fonction du faisceau péronéoastragalien postérieur a été examinée à l'aide d'un appareil permettant de soumettre l'articulation du pied à un couple déterminé et d'enregistrer simultanément les mouvements de rotation dans deux plans. Pour cet examen, on a employé 30 préparations anatomiques ostéoligamentaires dont la moitié ont été examinées dans les plans sagittal et horizontal, et l'autre moitié dans les plans sagittal et frontal.

Lors de l'examen, on a réalisé des coupes successives des ligaments latéraux — y compris notamment une coupe sélective des fibres longues et courtes du faisceau péronéo-astragalien postérieur. La fonction de ce ligament a été étudiée, d'abord avec les deux autres ligaments latéraux, puis avec le faisceau péronéo-calcanéen seul et enfin en tant que seul ligament intact de l'appareil ligamentaire latéral. La conclusion est que le faisceau péronéo-astraglien postérieur, lorsque les ligaments latéraux sont intacts, ne joue qu'un rôle annexe dans la stabilité du cou-de-pied.

Après rupture du faisceau péronéo-astragalien antérieur et du faisceau péronéo-calcanéen, les fibres courtes du ligament postérieur limitent par contre aussi bien la rotation interne, la rotation externe, le baillement que la flexion dorsale, alors que les fibres longues ne gênent que la rotation externe, le baillement et la flexion dorsale. Le faisceau péronéo-astragalien postérieur n'ayant pas de fonction stabilisatrice indépendante dans une articulation tibio-tarsienne intacte, une rupture isolée de ce ligament n'a probablement aucune chance de se produire.

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Rasmussen, O., Jensen, I.T. & Hedeboe, J. An analysis of the function of the posterior talofibular ligament. International Orthopaedics 7, 41–48 (1983). https://doi.org/10.1007/BF00267558

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