DDK is a symptom brought on by damage to the cerebellum and falls under the ataxia grouping.
The signs of Dysdiadochokinesia include changes in balance and gait, slow, awkward or rigid movements. A decline in the coordination of the arms, hands, or legs. Inarticulate or incomprehensible speech patterns and impairment of the ability to stop a directional movement and start the same action in the opposite direction.
For example, a person with DDK may have difficulty screwing or unscrewing a light bulb. They may also have a hard time repeating one to three syllables in a row quickly.
Your neurologist can perform simple in-office testing to evaluate DDK.
Rapidly Alternating Movement Evaluation
You’ll hold the palm of one hand on a flat surface (often the upper thigh), and then continuously flip the hand palm side up, then back to palm side down as fast as possible.
Point-To-Point Movement Evaluation
You’ll be asked to touch your nose and then, using the same finger and as quickly as possible, touch the outstretched finger of the person doing the test.
You’ll place one heel on one shin just below the knee, and then slide the heel down the shin to the foot. You should aim for rapid, coordinated movements.
You’ll stand still with your heels together and your eyes closed. If you lose your balance in this position, you may have some form of DDK.
You’ll be asked to walk normally, and then walk heel to toe.
Updated: June 13, 2018