Postural impairments constitute a common motor symptom of Parkinson’s disease (PD). While there is evidence that they might already be present pre-clinically, they are often associated with later stages of the disease. This is because current clinical assessments are insensitive to mild impairments and can only detect symptoms when the disease has progressed. Hence, this study aims at providing a sensitive objective measure of postural instability that is easy to obtain and might facilitate earlier clinical detection.