Summary. The trabecular architecture of the human ankle joint was studied three dimensionally by microradiography. The trabecular arrangement of the tibia and fibula was divided into four groups. The most characteristic orientation was observed in the bases of both malleoli where pressure-tension was caused by inversion and eversion of the talus. The talus showed two main trabecular arrangements: Trabeculae running between the trochlea and the posterior subtalar joint which supported body weight, and other trabeculae which belonged to part of the longitudinal foot-arch. The calcaneus showed four main trabecular arrangements. The first one was from the posterior subtalar joint to the tuber calcanei for supporting body weight, the second one was a part of the longitudinal foot-arch, the third one was the counterbrace of the second trabeculae, and the fourth one was the response to tension of the Achilles tendon.
Etude arehitecturale des trav~es osseuses an niveau de rartieulation de la chef, HeR~sum~. L'architecturale des trav6es osseuses au niveau de l'articulation de la cheville a 6t~ 6tudi6e en trois dimensions par microradiographie. La disposition des trav6es au niveau du tibia et du p6ron6 a 6t6 sch6matis6e en quatre groupes. L'orientation la plus caract6ristique s'observe gtla base des deux mall6oles off des ph6nom+nes de pression et de traction sont dfis au varus ou au valgus de l'astragale. Au niveau de l'astragale on observe essentiellement deux types de trav~e osseuse: les unes s'6-tendent entre la poulie astragalienne et la surface articulaire post~rieure et inf~rieure qui supporte le poids du corps alors que les autres font partie d'un ensemble s'intrgrant dans la voflte plantaire. Au niveau du calcanrum on observe quatre types principaux de travres. La premirre va de la surface articulaire postrrieure ou facette thalamique ~ la tubrrosit6 postrrieure qui supporte le poids du corps, la deuxi~me s'int~gre dans l'ensemble de la vofite plantaire, la troisi+me forme une contrearche fi la prrcrdente et la quatri+me est induite par la tension du tendon d'Achille.
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