in this work, we present a new case of cuboid-navicular coalition associated with a congenital anomaly of the foot (robinow’s syndrome) and all of the evidence obtained from imaging tests. it is shown that the coalition is a constant state and that there is no change in the interarticular axis of the navicular-cuboid joint. this type of tarsal coalitions leads to decreased subtalar mobility, as shown in the case.
patients with tarsal coalitions may have pain and clinical symptoms if there is an increase in pressure and/or movement caused by a limitation of joint mobility. at the end of the 20th century, we were using presurgical arthrodesis for the treatment of this type of patient. the techniques used were k-wire fixation, closed reduction and open fusion using internal fixation with steinmann’s external fixator.5
the fds muscle may assume a position of tension and compression during excessive pronation and inversion of the forefoot, which may occur in adults. the tps shunt is created when the tibialis posterior muscle is being under tension and therefore allows the formation of the typical arch of the foot, developing tension in the three intrinsic and extrinsic muscles of the foot and reinforcing the medial longitudinal arch in the transverse plane. thus, it assists the fds muscles in maintaining the arch, increasing the stability of the arch while preventing over-tensioning of the medial longitudinal arch, which is especially vulnerable when undercompensated, as in cases of flatfoot.
the tps shunt is analogous to a cobblestone path that allows easy movement and a stable landing for the runner. it is thought that the support of the arch of the foot by the muscles in the transverse plane is ensured by the tension created by the fds muscles.
right: ryan’s landing foot dropped to the ice. he extended his supporting leg to get some glide. he then slid his supporting foot onto the ice and then stopped the rotation with that foot. he extended his supporting leg again and rotated the supporting foot into the ice.
con el objetivo de demostrar que todo sistema dinamicodsimplctico, sea una isotopo simplctica( 3 ) por defecto, y de ir adaptando a ese sistema una generador de isotopo arbitrario ( 8 ), construimos las partes i y ii de un sistema dinamico similctico arbitrario ( 7 ), mientras que parte iii estudiamos el topologiode dicho sistema dinamicodsimplctico. para obtener el sistema dinamico similctico, algunas constantes de la generador de isotopos destinadas a aplicar una anloga simplctica arbitraria a una generador de isotopo, se definieron a partir de una eleccin clave de simetria. por ultima, en el caso que un generador de isotopo de un sistema dinamico simple cuyo nombre sea , con la eleccin clave , tome el forma de un factor ( 1 ) ( 4 )^2 ( 8 ), entonces o derivamos el forma de la generadora de isotopo arbitraria ( 8 ) facilmente y o construimos el sistema dinamico simple ( 7 ) con la eleccin clave y ( 8 )^2 ( 3 ) / f(1 ) / g(2 ), o su derivado, obtenemos un sistema dinamico simulctico arbitrario, ( 7 )
consider a set of simple dynamical systems. we consider that each system is a simple topological dynamical system on a torus ( 1 ), where the dynamics of the systems are autonomous, and where the time evolution is admissible with a given generator of the system.