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Dystonia After Brain Injury: Causes, Symptoms, and Treatment

Physical therapist teaching patient how to overcome dystonia after brain injury

Dystonia is a movement disorder that can occur after a traumatic brain injury.

You’re about to learn everything you need to know about dystonia after brain injury, including treatment options.

Causes of Dystonia After Brain Injury

Dystonia is a disorder in which the brain and muscles do not communicate. As a result, the muscles of the body contract involuntarily. This causes repetitive twitching or even twisting motions of whatever body part is affected.

Dystonia is caused by dysfunction of the basal ganglia, a cluster of neurons deep inside the cerebral cortex.

The basal ganglia play a pivotal role in helping your brain select the correct muscles to move. If they become damaged, then a person can lose coordinated muscle control completely.

To better understand dystonia and how it affects your movement, it will help to have some background on how the basal ganglia work.

How the Brain Controls Movement

For any movement to be executed correctly, two things must happen simultaneously:

  • The agonist muscles (the muscles that initiate movement) must contract.
  • The antagonist muscles (the muscles that inhibit movement) must relax.

The basal ganglia’s role is to control that process. They are in charge of telling which muscles need to activate and which need to relax. It does this by passing on inhibitory or excitatory signals to the right muscle groups.

Therefore, if an injury damages the basal ganglia, this normally harmonious process is disrupted. Instead of keeping the muscles balanced, the basal ganglia cannot suppress the antagonist muscles any longer.

This causes them to activate at the same time as the agonist muscles, resulting in uncontrollable twisting movements.

Symptoms of Dystonia After Brain Injury

woman rubbing her neck, experiencing symptoms of dystonia after brain injury

©iStock/fizkes

Dystonia does not usually appear until several months after a brain injury, and the onset is not always immediate. Some early symptoms of dystonia may include:

  • Trembling
  • Cramping
  • Dropping items frequently
  • Loss of fine motor control

Once dystonia fully develops, you will see the characteristic twisting and twitching motions.

In addition, post-traumatic dystonia tends to be paroxysmal. This means symptoms occur in episodes or attacks, rather than all the time. In fact, that is one of the hallmarks of dystonia that distinguishes it from spasticity after TBI.

Sometimes stress and anxiety can trigger dystonia attacks. That’s why it’s important to find ways to keep stress down. Some ways to do that are through acupuncture, meditation, and regular exercise.

Types of Dystonia

Dystonia can be divided into two types: focal dystonia and segmental dystonia.

Focal dystonia only impacts one part of the body. The most common areas that focal dystonia affects include:

  • Eyes
  • Jaw
  • Mouth
  • Neck
  • Arms/legs

Sometimes dystonia can also cause the torso to bend or writhe, but that is less common.

Segmental dystonia, on the other hand, strikes at two or more adjacent muscle groups at once. So, instead of just your neck acting up, both your neck and jaw would display symptoms.

With both segmental and focal dystonia, the side of your body opposite the brain-injured side is the one affected.

Treating Dystonia After Brain Injury

Man stretching fingers to relieve dystonia after brain injury

There are several options available to help you manage dystonia after brain injury. These include:

  • Medications. Oral medications can help keep dystonia flare-ups at bay. Some medications a doctor might prescribe include trihexyphenidyl and oral baclofen.
  • Botox injections. For more severe dystonia that causes pain and joint damage, Botox injections are another option. Botox blocks all nerve signals to the targeted muscle, effectively paralyzing it.
  • Surgery. In extreme cases, when the patient does not respond to either medication or Botox, doctors will perform a thalamotomy to remove the part of the brain that controls involuntary muscle movements. This should only be done as a last resort, however. Another surgical option is deep brain stimulation.

All of these approaches can help relieve the symptoms of dystonia. Unfortunately, most of them (besides surgery) are only temporary solutions.

That’s because medications do not address the root cause of dystonia, which is poor connection between the basal ganglia and the muscles. The basal ganglia cannot send signals to inhibit the antagonist muscles, which leads to uncoordinated movement.

The good news is, it’s possible to rebuild that connection to your muscles by activating neuroplasticity through physical therapy.

How Neuroplasticity Works to Treat Dystonia

Neuroplasticity refers to your brain’s ability to repair itself and create new neural pathways. These new pathways are formed through repetitive, therapeutic exercise.

This means one of the best ways to treat dystonia after brain injury is to exercise your affected muscles.

Of course, this can be hard to do, especially when the dystonia causes abnormal movements. That’s why your best option is to work with both a P.T. and a neurologist, so they can collaborate to find the ideal approach.

For example, you might need medication to get the dystonia under control first. Once the dystonia goes down, you can work on exercising the affected muscle to engage neuroplasticity.

Dystonia and TBI

Dystonia can be a painful condition if left untreated. Fortunately, with the right medication and therapy, it can be effectively managed.

As you participate in physical therapy, your brain will form new neural pathways, which should improve the communication between the basal ganglia and your muscles.

Once that communication is restored, the dystonia will decrease, which will let you move your muscles again with ease.

Featured Image: ©iStock/LSOphoto

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