Resumo

VELEZ ZEA, Jaime Andrés; BUSTAMANTE GOEZ, Liliana Marcela  e  VILLARRAGA OSSA, Junes Abdul. RELATION BETWEEN RESIDUAL LIMB LENGTH AND STRESS DISTRIBUTION OVER STUMP FOR TRANSFEMORAL AMPUTEES. Rev.EIA.Esc.Ing.Antioq [online]. 2015, n.23, pp.107-115. ISSN 1794-1237.

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.

Palavras-chave : Transfemoral amputee; Stresses; Finite element; Prostheses.

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