Inclusion Criteria- Presentation of dystonia and/or spasticity or, if in control group, no neurological injury nor abnormal muscle tone
- Over the age of five.
Exclusion Criteria- Intolerable pain with manipulation of the knee, ankle, wrist, or elbow
- Limited range of motion in the knee, ankle, wrist or elbow due to orthopedic injury or severe contraction.
- Cognitive impairment resulting in inability to provide informed consent or complete the protocol.
- Under the age of five.