Spasticity After Stroke

After a stroke, the messages that help muscles contract and relax can become unbalanced. Weakness is often the most obvious early problem, but some people later develop increased tone, spasms or patterned postures on the affected side. This is called post-stroke spasticity.

Spasticity is not simply a tight muscle. It is part of the upper motor neuron syndrome caused by brain injury. The same person may have overactive muscles, profound weakness, reduced sensation and difficulty selecting one movement without unwanted activity elsewhere.

When does post-stroke spasticity appear?

Timing varies. Increased tone may be noticed in the first weeks, or it may become clearer over several months as reflex activity changes and the person uses the limb differently. Not every stroke survivor develops troublesome spasticity. Risk appears higher with severe weakness, sensory loss and more extensive motor pathway injury, but prediction is imperfect.

Regular review is valuable when the arm or leg remains very weak, the hand starts closing, the ankle points downward or caregivers notice increasing difficulty moving the limb.

Common patterns

In the arm, the shoulder may turn inward, the elbow may bend, the forearm may rotate, and the wrist and fingers may flex. The thumb can pull into the palm. In the leg, the hip and knee may become stiff, the ankle may point down or inward and the toes may curl. These are common patterns, not a diagnostic checklist.

The effect depends on the task. A clenched hand may interfere with washing, nail care, dressing or splint use. A stiff ankle may affect balance, foot clearance and shoe fit. Spasms can interrupt sleep or make transfers unpredictable.

Spasticity is not the only reason movement is difficult

Weakness, pain, shoulder injury, swelling, joint stiffness, neglect, apraxia and sensory change can all limit movement after stroke. A fixed contracture may develop when a joint loses passive range, but resistance during examination can also reflect dynamic muscle overactivity. Treatment should be based on the contribution of each problem.

How clinicians assess it

Assessment includes the person’s goals, the timing and triggers of symptoms, passive and active movement, strength, sensation, pain, skin condition and performance of relevant activities. Clinicians may use the Modified Ashworth or Tardieu scales, but a tone score cannot show whether hygiene, walking or hand use improved.

A useful goal is specific: open the palm for cleaning, reduce shoulder pain during dressing, place the heel more safely or decrease spasms that wake the person at night. Baseline measurement makes later treatment review more meaningful.

Treatment options

Rehabilitation may include supported range of motion, strengthening, task-specific practice, positioning, gait training, upper-limb activities and caregiver education. A splint or ankle-foot orthosis may support selected goals but requires careful fitting and skin monitoring.

Botulinum toxin can temporarily reduce activity in selected muscles when the problem is focal. Oral medicines may be considered for more generalized symptoms, although sedation and weakness can limit their usefulness. Intrathecal baclofen or surgery may be considered for selected severe cases. Treatment is usually most effective when medical intervention and rehabilitation follow the same goal.

Why follow-up matters

Reducing tone is not the endpoint. The team should review comfort, movement, ease of care, walking or arm use at an appropriate interval. If the goal was not met, clinicians may reconsider muscle selection, dose, therapy, fixed shortening or the original assumption about what was limiting function.

When to seek help

Arrange an assessment when stiffness or spasms cause pain, interfere with sleep, hygiene, dressing, walking or equipment, or when the limb is losing range. Seek urgent care for new stroke symptoms such as sudden weakness, facial droop, speech difficulty, severe headache or loss of balance.

Continue with our guides to symptoms and diagnosis, treatment options and rehabilitation.

Sources

1. American Stroke Association. Spasticity. Updated 2025.
2. Francisco GE, et al. Post-Stroke Spasticity. Clinical Pathways in Stroke Rehabilitation. 2021.
3. Suputtitada A, et al. Best Practice Guidelines for Post-Stroke Spasticity. 2024.
4. Wissel J, et al. Botulinum neurotoxin treatment of post-stroke shoulder spasticity. Front Neurol. 2022.

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Public-service medical disclaimer: this article provides general education. It does not provide diagnosis or treatment and should not guide an individual medical decision.