Occlusion disorders have been often thought as a determining factor or a pre-existing cause of many musculoskeletal diseases due to the observation that masticatory muscles belong to the so called "postural chain". The Authors noticed that many studies looked for a sagittal correlation with problems affecting the transverse diameters while sometimes incorrect mandibular positions occurred with skeletal disorders. In the present research, the Authors chose children with monolateral crossbite, without any other occlusion disharmony, skeletal disorder or vision pathology to look for differences in foot support between the right and the left side of the body by using a stabilonzetric board. The results show that children with monolateral crossbite have monolateral support too, and this happens on the side of normal occlusion. In contrast with musculoskeletal disorders where a postural compensation may occur thanks to the "postural chain' it seems that a skeletal asymmetry produces a loss of balance in the whole body.