Spasticity After Traumatic Brain Injury: Symptoms, Assessment and Treatment

Spasticity can develop after a traumatic brain injury (TBI) when damage disrupts the brain pathways that normally regulate muscle tone and reflexes. An arm may pull into a bent position, a leg may become difficult to place during walking, or sudden spasms may interfere with sleep, hygiene and care. The pattern can change during recovery, and not every feeling of stiffness is caused by spasticity.

This guide explains how spasticity may appear after TBI, how a rehabilitation team evaluates its real-life impact and how treatment is selected. The aim is not automatically to remove all muscle tone. Treatment is considered when overactivity causes pain, threatens joint or skin health, limits meaningful activity or makes daily care more difficult.

Key points

• Spasticity is one possible consequence of TBI, especially after a moderate or severe injury, but stiffness may also reflect weakness, pain, dystonia, joint restriction or developing contracture.
• The most useful assessment combines examination of muscle tone with movement, comfort, skin, sleep, self-care, mobility and the goals of the injured person and family.
• Not every increase in tone needs treatment. In some people, a degree of stiffness helps with standing, transfers or stability.
• Treatment usually combines rehabilitation and prevention of secondary problems with carefully selected focal or systemic interventions.
• TBI-specific treatment research is limited. Decisions should be individual, reviewed over time and based on meaningful outcomes rather than a tone score alone.

Why can spasticity develop after a traumatic brain injury?

Normal movement depends on a continuous balance between signals that activate muscles and signals that limit unnecessary reflex activity. A TBI can damage the networks that provide this control. When descending inhibition is reduced, a muscle may respond too strongly to a rapid stretch. This velocity-dependent increase in resistance is a central feature of spasticity.

TBI is a broad diagnosis. A mild concussion and a severe injury involving prolonged unconsciousness are very different clinical situations. Spasticity is more often a concern after injuries that damage motor pathways and leave weakness or impaired selective movement. It may become apparent during the early hospital phase, during inpatient rehabilitation or later, as the person becomes more active and the demands on the affected limbs increase.

Spasticity is only one part of the upper motor neuron syndrome. Weakness, reduced motor control, exaggerated reflexes, clonus, involuntary associated movements and fatigue can coexist. Cognitive, behavioural, communication, sensory and visual changes caused by TBI may also affect how the person reports symptoms, follows instructions or participates in a treatment programme.

What can spasticity look like after TBI?

The pattern depends on the location and extent of the brain injury. One side of the body may be affected more than the other, or both sides may be involved. In the upper limb, the shoulder may turn inward, the elbow may bend, the forearm may rotate, and the wrist or fingers may close. In the lower limb, the hip may pull inward, the knee may remain stiff or bend unpredictably, and the ankle may point down or turn in.

These patterns can affect dressing, washing the palm, cutting nails, placing an arm on a support, sitting balance, transfers and walking. Repeated spasms may disturb sleep. A tightly closed hand can trap moisture and increase skin risk. Persistent abnormal positioning may contribute to pain, loss of joint range and eventually a fixed contracture.

Symptoms can fluctuate. Fatigue, emotional stress, pain, constipation, a full bladder, infection, tight clothing, poor seating or a skin wound may temporarily increase spasms and resistance. A sudden change should prompt a search for a trigger rather than an automatic increase in antispasticity medication. The guide to suddenly worsening spasticity explains a practical checklist.

Importantly, visible stiffness is not always spasticity. A painful shoulder, scar tissue, joint damage, muscle shortening, guarding or dystonia can feel similar. TBI may produce mixed movement disorders. Treating the wrong mechanism may offer little benefit and can sometimes make function worse.

How is spasticity assessed after TBI?

A good assessment starts with the person’s experience and daily routine. The team asks when stiffness or spasms occur, what makes them better or worse, whether they cause pain, and which activities are difficult. Family members and caregivers may provide useful observations, especially when memory, insight, speech or alertness has changed after the injury.

The physical examination looks at resting posture, passive and active movement, reflexes, strength, selective motor control, sensation, joint range and skin. The clinician moves a limb at different speeds to explore whether resistance is velocity-dependent. Measures such as the Modified Ashworth Scale and Modified Tardieu Scale may describe part of the examination, but neither scale captures the full effect on function. Read more about how spasticity is measured.

Assessment should separate dynamic muscle overactivity from fixed shortening. A joint that moves farther when the muscle is stretched slowly may have a substantial dynamic component. A joint that remains restricted at every speed may have structural shortening or another mechanical problem. Pain, swelling, fracture, heterotopic ossification and peripheral nerve injury also need consideration after significant trauma.

The team observes meaningful tasks whenever possible: reaching, opening the hand for hygiene, sitting, standing, transferring, walking, using stairs or positioning in bed. Video, gait analysis, ultrasound or diagnostic nerve blocks may be useful in selected cases. The choice of test depends on the question being asked, not on a requirement to collect every possible score.

Review the whole clinical picture

Medication effects, seizures, hydrocephalus, sleep, autonomic problems, swallowing and cognition can change the treatment plan. For example, a medicine that lowers tone but causes marked drowsiness may reduce therapy participation or increase falls. A person who uses tone to stand may lose a useful compensation if treatment is too broad. The assessment therefore includes both potential benefit and potential harm.

Does every person with TBI-related spasticity need treatment?

No. Spasticity is treated when it creates a specific problem or foreseeable risk. Mild tone that is comfortable, stable and not limiting activity may simply be monitored. In some people it assists standing, transfers or maintaining leg position. Removing it without considering underlying weakness can reduce independence.

Useful goals are concrete and observable. Examples include opening the hand enough for cleaning, reducing painful night spasms, placing the foot more safely, tolerating an orthosis, making assisted dressing easier or improving walking efficiency. A goal such as “reduce tone” describes an impairment but not why treatment matters. The guide to setting goals for spasticity treatment offers a structured approach.

Goals should be agreed with the injured person as far as possible. Family and caregivers contribute important information, but treatment should respect the person’s comfort, preferences and tolerance. The team should also define how and when success will be reviewed. If the intended outcome does not improve, continuing the same intervention may not be justified.

Rehabilitation and everyday management

Rehabilitation for spasticity is usually the foundation of management. It aims to preserve movement options, prevent avoidable complications and help the person practise activities that matter. The programme may involve physiotherapy, occupational therapy, rehabilitation medicine, nursing, speech and language therapy, orthotics, psychology and other disciplines according to the effects of the TBI.

Positioning and movement through the day

Regular position changes can reduce prolonged pressure and support comfort. Seating should stabilise the pelvis and trunk without forcing a limb into a painful posture. In bed, supports may help maintain alignment, but equipment must not create pressure points or restrict breathing and circulation. A plan that works in the clinic must also be practical for home, transport and sleep.

Gentle active or assisted movement helps maintain joint range and gives the person opportunities to use available motor control. Stretching may be included, but forceful pulling against a painful or rigid joint is not appropriate. Strength, endurance, balance and task practice are often as important as flexibility. Treatment should not assume that every movement problem will improve merely because tone is reduced.

Splints, orthoses and casting

A hand splint, ankle-foot orthosis or serial cast may be considered to support position, protect tissue or provide a prolonged stretch. Fit must be reviewed as tone, swelling and function change. Redness that does not fade, blistering, new pain, numbness or increased spasms can indicate excessive pressure. See splints and orthoses for spasticity for practical safety points.

Caregiver involvement

Families often carry out positioning, transfers, skin checks and home practice. Training should include what to do, what not to force and which changes require professional advice. A plan should be realistic about caregiver time and physical capacity. The caregiver’s guide to spasticity includes safer routines for hygiene, dressing and movement.

Medicines and focal treatments

Treatment choice depends on whether problematic overactivity is focal, multifocal or widespread. The clinical team also considers alertness, swallowing, breathing, seizure treatment, liver and kidney function, other medicines and the person’s rehabilitation goals.

Botulinum toxin injections

When selected muscles create a specific problematic pattern, botulinum toxin injections may temporarily reduce their activity. The muscle selection should follow a clear goal, such as improving hand hygiene, easing arm positioning or changing ankle posture during gait. Ultrasound or electrical guidance may be used. The effect develops gradually and wears off, so it should be paired with a plan for therapy, positioning, orthotic review or task practice.

Phenol or alcohol neurolysis

A specialist may use a chemical neurolysis procedure to reduce activity in a selected motor nerve or branch. This can address a larger distribution than a single muscle injection, but it requires detailed anatomical knowledge and careful discussion of risks, including pain, sensory disturbance and unwanted weakness. It is not suitable for every nerve or every patient.

Oral medicines

Oral antispasticity medicines such as baclofen or tizanidine may be considered when spasms or tone are more widespread. They can cause drowsiness, dizziness, low blood pressure or weakness. These effects deserve particular attention after TBI because attention, alertness, balance and participation may already be vulnerable. Treatment is usually introduced gradually and reviewed against the agreed goal.

Do not change the dose or stop baclofen suddenly without medical advice. Abrupt withdrawal can be dangerous. Medication decisions should also account for drugs used for seizures, sleep, mood, pain or behaviour, because combined sedating effects may be important.

Intrathecal baclofen and surgical options

For severe, widespread spasticity that remains problematic despite other measures, an intrathecal baclofen pump may be assessed. The device delivers baclofen into the fluid around the spinal cord. A screening trial and detailed goal setting are commonly used before implantation. The pump needs refills, programming and a reliable emergency plan. Sudden interruption can cause life-threatening withdrawal, so families must know the warning signs and contact pathway.

Orthopaedic surgery may be considered when fixed shortening, joint instability or bone deformity is a major barrier. Tendon procedures do not treat the brain injury itself and require postoperative rehabilitation. Neurosurgical procedures for spasticity are reserved for carefully selected situations. A multidisciplinary review should explain which component each proposed operation is intended to change.

Evidence specifically comparing spasticity treatments after TBI remains limited. The best available TBI-focused systematic review found small, varied studies and could not draw firm conclusions about the relative benefits and harms of individual interventions. This does not mean treatment is ineffective. It means clinicians should be transparent about uncertainty, avoid one-size-fits-all claims and track outcomes that matter to the individual.

When does worsening stiffness need urgent assessment?

Seek urgent medical advice for a new neurological change, reduced consciousness, repeated vomiting, a severe or rapidly worsening headache, a new seizure, new weakness, breathing difficulty, fever with marked deterioration or suspected shunt malfunction. These symptoms should not be assumed to be “just spasticity.”

Prompt assessment is also needed for a hot or swollen limb, suspected fracture, severe unexplained pain, rapidly developing loss of movement, significant skin breakdown or a sudden major increase in spasms. In someone with an intrathecal baclofen pump, possible withdrawal or overdose is an emergency and should follow the specialist team’s instructions immediately.

Questions to take to the rehabilitation appointment

• Which movement problem is actually caused by spasticity?
• Is there fixed contracture, pain, dystonia or weakness as well?
• Does the current tone help with standing, transfers or another task?
• What is the most important goal for the next treatment period?
• How will we measure whether the intervention helped?
• What rehabilitation or home practice should accompany it?
• Could the treatment affect alertness, balance, swallowing or seizure medicines?
• Which warning signs require urgent contact?

Frequently asked questions

How soon after a TBI can spasticity appear?

It may emerge during the early recovery period or become clearer over weeks and months. The timing varies with injury severity, motor pathway damage, medical complications and activity level. Ongoing review is more useful than relying on one early examination.

Can spasticity continue to change years after the injury?

Yes. The neurological injury is not the only influence. Pain, illness, ageing, activity, seating, medication, contracture and musculoskeletal problems can change how stiffness and spasms affect daily life.

Is a high Modified Ashworth score enough to choose treatment?

No. The score describes resistance during a passive movement and does not by itself show pain, voluntary control or functional impact. Treatment should link the examination to an agreed goal.

Can treatment make function worse?

It can if useful tone is reduced too broadly, weakness becomes more apparent or side effects outweigh benefit. This is why selective treatment, gradual dosing and planned reassessment are important.

Which specialist treats TBI-related spasticity?

Care is often coordinated by a physician in rehabilitation medicine, neurology or another spasticity service, working with physiotherapy, occupational therapy, nursing, orthotics and relevant surgical specialists. The exact team depends on local services and the person’s needs.

Medical disclaimer and editorial information

This information is provided as a public service for general education. It is not a substitute for personal medical advice, diagnosis or treatment. A clinician who knows the injury, medicines and current function should assess new or worsening symptoms. This page is not presented as medically reviewed by an identified professional.

Last updated: 20 September 2026. See our Editorial Policy.