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Spasticity is stiff or rigid muscles. It may also be called unusual tightness or increased muscle tone. Reflexes (for example, a knee-jerk reflex) are stronger or exaggerated. The condition can interfere with walking, movement, or speech.
Muscle stiffness; Hypertonia
Spasticity is often caused by damage to the part of the brain that is involved in movements under your control. It may also occur from damage to the nerves that go from the brain to the spinal cord.
Symptoms of spasticity include:
Carrying the shoulder, arm, wrist, and finger at an abnormal angle because of muscle tightness
Exaggerated deep tendon reflexes (the knee-jerk or other reflexes)
Repetitive jerky motions (clonus), especially when you are touched or moved
Scissoring (crossing of the legs as the tips of scissors would close)
Spasticity may also affect speech. Severe, long-term spasticity may lead to contracture of muscles. This can reduce range of motion or leave the joints bent.
This list does not include all conditions that can cause spasticity.
Exercise, including muscle stretching, can help make symptoms less severe. Physical therapy is also helpful.
When to Contact a Medical Professional
Contact your health care provider if:
The spasticity gets worse
You notice deformity of the affected areas
What to Expect at Your Office Visit
Your doctor will perform a physical exam and ask about your symptoms, including:
When was it first noticed?
How long has it lasted?
Is it always present?
How severe is it?
Which muscles are affected?
What makes it better?
What makes it worse?
What other symptoms are present?
After determining the cause of your spasticity, the doctor may refer you to a physical therapist. Physical therapy involves different exercises, including muscle stretching and strengthening exercises. Physical therapy exercises can be taught to parents who can then help their child do them at home.
Other treatments may include:
Medicines to treat spasticity. These need to be taken as instructed.
Botulinum toxin that can be injected into the spastic muscles.
In rare cases, a pump used to directly deliver medicine into the spinal fluid and nervous system.
Sometimes surgery to release the tendon or to cut the nerve-muscle pathway.
Griggs RC, Jozefowicz RF, Aminoff MJ. Approach to the patient with neurologic disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 396.
McGee S. Examination of the motor system: approach to weakness. In: McGee S, ed. Evidence-Based Physical Diagnosis. 4th ed. Philadelphia, PA: Elsevier; 2018:chap 61.