Abstract After amputation, fitting of the prosthesis in the adaptation and gait of an individual is crucial. However, this known dynamic alignment process is subjective on the part of the professional who makes said adjustment, compromising the stability of the individual. Therefore, a kinematic model to analyze the effects of dynamic alignment during the transtibial amputees gait in the sagittal plane using Opensim was developed. For this group, the socket position (Flexion and Extension, Abduction and Adduction) and the movements of prosthetic foot (Plantarflexion and Dorsiflexion, Inversion and Eversion) were analyzed. In opensim, the “osim” pilot was amputated incorporating a transtibial prosthesis that was previously modeled in Solid work, with a Matlab script the variation of the position of the prosthesis using inverse kinematics was simulated, results were validated on a subject with wireless sensors for the measurement. The model showed that acceptable gait patterns are found in positive variations between 2 ° and 6° for the socket and 2 ° for the prosthetic foot.