This paper presents a proelastic simulation and analysis of an axisymmetric finite element model of the lumbar spine's motion segment, including the L 4 and L 5 vertebrae and the intervertebral disc. This model was subjected to two different compressive loads at the end of the L 4 vertebra, and the impact on the stresses and strains distribution and the deformations of this motion segment has been analyzed and compared. The results indicate that applying compressive load to this motion segment leads to the greatest displacement and deformation in the middle disc, contributing to various disc diseases such as degeneration and herniation. Investigating the relationship between different mechanical loads and intervertebral disc diseases is challenging due to the limitation of experiments on living organisms, and its results are limited and unique. Studying a personalized finite element model of this motion segment, tailored to the patient's specific clinical characteristics, enables the simulation of its biomechanical behavior to identify the most suitable treatment for each individual