incoordination AE YH According to the Vaccine Adverse Event Reporting System (VAERS), 'incoordination' was mentioned in 261 VAERS reports (0.2%) during1991-2001 (Reference: PMID: 12825543). a movement disorder AE that has an outcome of incoordination a lack of normal adjustment of muscular action so that the intended movement of the limb or other part is not made smoothly and harmoniously, and does not accurately achieve its objective. If the abnormality is hypermetric, the condition is referred to as ataxia. If it is inclined to weakness, e.g. knuckling at the turn, stumbling, failure to flex limbs properly, or to misdirection as in a proprioceptive deficit, it is called incoordination. movement disorder AE