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Late onset Pompe disease (LOPD) is characterized by significant motor disabilities, which affect in particular ambulation. Only one study reports on spatial-temporal parameters of gait assessed in a clinical heterogeneous group of unrelated patients. In this study spatiotemporal and kinematic gait patterns are described in a genetically homogenous group of LOPD patients using 3d movement analysis. 7 LOPD siblings, harbouring the same GAA mutations compound, were assessed with clinical scales and with 3d movement analysis to measure spatial-temporal and kinematic parameters during gait cycle and “sit to stand test”. Relevant abnormalities were observed either in spatial-temporal and kinematic parameters. The former consisted in a trend towards a decreased velocity and cadence, a prolonged time in double limb support, shorter step and stride length, and a widening of base of support; the latter in an increased anterior pelvic-tilt and posterior trunk-tilt during the whole gait cycle, a decreased pelvic obliquity, active hip extension and ankle dorsiflexion. This study shows, in homogenous group of LOPD patients, either spatial-temporal and kinematic deviations that may improve understanding of the musculoskeletal alterations, the evolution of disease and the answer to the enzyme replacement therapy.