General Information on Spasticity
Disease Details and Frequently Asked Questions
It is a condition of abnormal muscle tightness due to prolonged, involuntary muscle contractions. Because the damaged central nervous system fails to transmit the 'relax' command, the muscles remain constantly rigid, exhibiting a sharp, clasp-knife resistance when an attempt is made to forcibly extend the limbs.
The pathology does not originate within the muscle itself, but rather stems from damage to the Central Nervous System (Brain/Spinal Cord). Primary etiologies include perinatal hypoxia (Cerebral Palsy), intracranial hemorrhage/ischemic stroke, Multiple Sclerosis (MS), central nervous system tumors, and traumatic spinal cord injuries.
Signs include an unnaturally rigid posture in the upper and lower extremities, fingers tightly clenched into a fist, elbows locked in a flexed position, 'scissoring' (involuntary crossing) of the legs during ambulation, and a profound loss of joint range of motion.
Chronically spastic (hypertonic) muscles undergo structural shortening over time, permanently freezing the joints in abnormal positions—a condition known as a Contracture. Once this irreversible stage is reached, the muscles cannot be elongated without complex orthopedic surgery, leaving the patient permanently deformed.
Diagnosis is made clinically by a Neurologist through passive, rapid flexion and extension of the patient's limbs to elicit the 'clasp-knife response' (a sudden catch and release of resistance). The severity and degree of muscle hypertonia are objectively graded using the Modified Ashworth Scale.
While there is no pharmacological cure to repair the underlying neural lesion, treatment focuses on aggressive muscle relaxation. Intensive Physical Therapy (Rehabilitation) and guided stretching exercises form the backbone of management.
Oral muscle relaxants (such as Baclofen) are utilized. One of the most effective interventions involves precise intramuscular Botox (Botulinum Toxin) injections into the spastic muscles; this induces a temporary localized chemical paresis (paralysis) lasting 3-6 months, permitting the physiotherapist to stretch and retrain the muscle effectively.
Our health library contents are prepared for informational purposes only and with scientific data available at the time of recording. For all your questions, concerns, diagnosis, or treatment regarding your health, please consult your doctor or a healthcare institution.
