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Spasticity is stiff or rigid muscles with exaggerated, deep tendon reflexes (for example, a knee-jerk reflex). The condition can interfere with walking, movement, or speech.

See also: Muscle cramps

Spasticity generally results from damage to the part of the brain that controls voluntary movement. It may also occur when you have damage to the nerves traveling from brain down to spinal cord.

Symptoms of spasticity include:

• Exaggerated deep tendon reflexes (the knee-jerk or other reflexes)
• Scissoring (crossing of the legs as the tips of scissors would close)
• Repetitive jerky motions (clonus), especially when touched or moved
• Unusual posturing
• Carrying the shoulder, arm, wrist, and finger at an abnormal angle due to tightness of the muscle

Spasticity may also interfere with speech. Severe, long-term spasticity may lead to contracture of muscles, causing joints to be bent at a fixed position.

• Cerebral palsy
• Brain damage caused by lack of oxygen, as can occur in near drowning or near suffocation
• Brain trauma
• Severe head injury
• Spinal cord injury
• Stroke
• Adrenoleukodystrophy
• Phenylketonuria
• Neurodegenerative illness
• Multiple sclerosis

This list is not all-inclusive.

Exercise, including muscle stretching, can help make your symptoms less severe. Home-based physical therapy is also helpful

Contact your health care provider if:

• The spasticity worsens
• Contracture deformities appear to be developing

Your doctor will perform a physical exam and ask questions about your symptoms, including:

• When was it first noticed?
• How long has it lasted?
• Is it always present?
• How severe is it?
• What muscles are affected?
• What makes it better?
• What makes it worse?
• What other symptoms are also present?

Your doctor may refer you to a physical therapist. Physical therapy consists of variety of exercises, including muscle stretching and strengthening exercises. Physical therapy exercises can be taught to parents who may then help their child perform them at home.

Medicines for spasticity include baclofen, tizanidine, cyclobenzaprine, and benzodiazepines. In rare cases, a pump may be inserted into the spinal fluid to directly deliver medicine to the nervous system.

Botox injections may help relieve spasticity symptoms in some patients.

Sometimes, a person may need surgery to release the tendon or to cut the the nerve-muscle pathway.

Muscle stiffness

Griggs R, Jozefowicz R, Aminoff M. Approach to the patient with neurologic disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 418.

Hammerstad J. Strength and reflexes. In: Goetz, CG, ed. Textbook of Clinical Neurology. 3rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 15.

Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Daniel B. Hoch, PhD, MD, Assistant Professor of Neurology, Harvard Medical School, Department of Neurology, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.