While LLD leads to adjustments in the lower limbs and pelvis during walking, few studies have looked at its impact on upper body movements. This study aimed to investigate how simulated LLD affects the three-dimensional motion of the pelvis and spine during walking. Seven male participants walked without shoes at their usual pace with simulated LLD of 1, 2, and 3cm achieved by adding material to the right foot. Motion capture technology recorded movements of the pelvis and different sections of the spine (lumbar, lower thoracic, upper thoracic). Minimal differences were observed in the range of motion and movement patterns of the pelvis and lumbar spine between walking without shoes and under LLD conditions. This suggests that compensations in the lower limbs may reduce the impact higher up the body. Further research is required to fully understand the intricate biomechanical adaptations to LLD throughout the body’s movement chain during walking. Our ongoing research in this area focuses on identifying causative factors and improving the clinical management of non-specific low back pain. We’ve also conducted a quantitative exploration of current clinical assessment techniques with the aim of implementing research-informed clinical practices.