RELACIÓN ENTRE LA LONGITUD DEL MIEMBRO RESIDUAL Y LA DISTRIBUCIÓN DE ESFUERZOS SOBRE EL MUÑÓN PARA AMPUTADOS TRANSFEMORALES

Five transfermoral prosthesis models compounded by socket, stump and femur were built. The percentage of residual
limb for each individual was defined. Each model appertained to a volunteer whom molds stump and stump socket and scans
were taken. The parts were digitized into a CAD model and the assembly was exported to finite element analysis software. Gait
analysis was performed and it is established that the most critical conditions for the forces of reaction occurs in the initial phase
of support. For this phase, a static model was formulated. Likewise loads on the socket were calculated taking into account the
reaction forces on the ground. The stance phase of the socket, the relaxation phase and the final phase load were simulated by the
software, acquiring values and distributions of pressure and shear forces on the stump surface to the loading phase and the main
von Mises stresses for the femur. These values were related to the percentage of residual limb in order to find relationships and
trends. It was found that a relationship exists between the percentage of residual limb and the pressures on the stump surface.