Spasticity

For family education. This resource is not an individual diagnosis or treatment plan. Discuss concerns with an appropriately qualified professional.

What it means

Spasticity is a specific form of increased muscle tone in which resistance to passive stretch depends partly on how quickly the limb is moved. It can interfere with comfort, movement, care, and participation. It is a sign of an underlying neurological condition rather than a diagnosis that explains the whole child.

Causes and risk factors

Spasticity is associated with disrupted motor pathways in the brain or spinal cord. Cerebral palsy is an important childhood cause; brain or spinal cord injury and other neurological conditions can also produce it. Pain, illness, fatigue, and poor positioning may make its impact more noticeable.

Signs and everyday impact

A child may have stiff limbs, spasms, difficulty moving smoothly, restricted comfortable positions, or challenges with dressing and hygiene. Spasticity may coexist with weakness and fixed joint limitations. A stiff limb alone does not prove spasticity; other tone patterns must be distinguished.

Assessment and diagnosis

The team assesses neurological findings, response to passive movement, range of motion, strength, pain, and the effect on daily activities. Orthopedic and functional assessment may be needed. Treatment planning identifies whether the goal is pain relief, easier care, movement, positioning, or prevention of complications.

Treatment and therapy

Options include individualized therapy and positioning, orthoses, medicines, targeted botulinum toxin injections, and selected surgical or intrathecal treatments. These require specialist assessment and monitoring. Reducing tone can sometimes reveal or increase functional weakness, so benefits and tradeoffs must be considered. The aim is meaningful improvement rather than eliminating every sign of tone.

Support at home

Use the handling, movement, and equipment plan demonstrated by the team. Report discomfort, skin pressure, constipation, illness, and changes in function. Never force stretches through pain. If a medicine or pump is used, follow the team's missed-dose and emergency instructions.

When to seek help

Sudden major worsening with illness, severe pain, or altered awareness needs assessment. Suspected pump malfunction or medication withdrawal, breathing difficulty, or serious neurological change requires urgent care.

Questions for the care team

• Which difficulties are specifically caused by spasticity?
• What benefits and risks does the proposed treatment have?
• How will comfort, care, or participation be measured afterward?

Terms in plain language

• Velocity-dependent: changing with the speed of stretch.
• Intrathecal: delivered into the fluid around the spinal cord.
• Range of motion: how far a joint can move.

Podcast preparation

Use this resource to prepare a later episode: define the topic, discuss causes and signs, explain assessment, describe treatment and home supports, then close with urgent signs and a next step.

Less tone is not automatically better function; treatment needs a clear goal.

Verify current clinical guidance and obtain clinical review before public recording.

Sources

1. Spasticity: MedlinePlus Medical Encyclopedia - https://www.medlineplus.gov/ency/article/003297.htm
2. Cerebral Palsy | National Institute of Neurological Disorders and Stroke - https://www.ninds.nih.gov/health-information/disorders/cerebral-palsy?Campaign_Content=100006380375789&linkId=100000294187174
3. Is Your Baby’s Physical Development on Track? - HealthyChildren.org - https://www.healthychildren.org/English/ages-stages/baby/Pages/Is-Your-Babys-Physical-Development-on-Track.aspx

Sources accessed 3 October 2026.