Tibiotarsian joint orthosis (1), configured for immobilization of the tibiotarsian joint, comprising a stabilization element (16) in one piece with a heel section (17), which receives the heel in the support position, with a lateral section (18) that is connected therein and with a fibula section (19) that surrounds the fibula on the rear side, which is connected therein, where on the outer side of the stabilization element (16) are provided one or more joining elements (22), characterized by a knitted piece (2), which is knitted adapted in its shape to the anatomy of the leg and foot in the area of the tibiotarsian joint and which includes all sides in the resting position of the tibiotarsian joint and adjacent areas of the leg and foot, and that can be opened or widened by sections when placed and can be compressed and tightened in the support position through means of fixing (9), in which one or more second connecting elements (14) are provided on the inner side (13) of the knitted piece (2), such that the stabilization element (16) that It can be inserted in the knitted piece (2), whose lateral section extends laterally in front of the roller joint, can be detachably fixed through the connection of the first joining element (22) with the second joining element (14) in the knitted piece (2).Órtesis de articulación tibiotarsiana (1), configurada para la inmovilización de la articulación tibiotarsiana, que comprende un elemento de estabilización (16) de una sola pieza con una sección de talón (17), que recibe el talón en la posición de soporte, con una sección lateral (18) que se conecta en ella y con una sección de peroné (19) que rodea el peroné en el lado trasero, que se conecta en ella, en la que en el lado exterior del elemento de estabilización (16) están previstos uno o varios elementos de unión (22), caracterizada por una pieza de género de punto (2), que está tricotada adaptada en su forma a la anatomía de la pierna y del pie en la zona de la articulación
