Why is asking whether a child will walk the wrong question?

Because it flattens a genuinely wide range of real outcomes into a false yes or no. A child might walk independently, walk with a limp, walk using crutches or a walker, walk short distances but need a wheelchair for longer ones, or use a wheelchair primarily. All of these are meaningfully different situations that a simple walk or won't walk answer completely fails to capture, which is exactly why a more detailed classification tool is so much more useful.

What is the GMFCS, and what does it actually measure?

The Gross Motor Function Classification System, or GMFCS, is a five level tool used internationally to describe a child's typical, everyday movement ability, focusing especially on sitting, walking, and the use of wheeled mobility. Importantly, it's based on a child's usual performance in real settings like home, school, and the community, not their single best possible performance in a clinic, which makes it a much more honest, practical description of day to day function.

What do the five GMFCS levels actually mean?

In general terms: Level I means walking without limitations. Level II means walking with some limitations, such as difficulty on uneven ground or in crowds. Level III means walking using a hand-held mobility device such as a walker or crutches. Level IV means self-mobility is limited and powered mobility may be used. Level V means a child is transported in a manual wheelchair, with very limited self-directed movement even with equipment. Exact descriptions are further adjusted by age, since expected abilities differ significantly between a toddler and a twelve year old.

Does spastic diplegia always mean a specific GMFCS level?

No, and this is an important nuance. Diplegia describes which parts of the body are affected (the legs, more than the arms), while GMFCS describes how significantly that affects function. Children with spastic diplegia are found across the entire GMFCS range, from level I through level V, which is exactly why the diagnosis label alone doesn't answer the walking question, but a GMFCS level genuinely does.

If the legs are mainly affected, does that mean hand function is normal?

Often, yes, relatively speaking. Research specifically comparing gross motor function to hand function found that in children with spastic diplegia, hand function tends to be relatively better preserved compared to leg and overall gross motor function, the reverse pattern from what's typically seen in hemiplegia. This is a genuinely useful thing to know when thinking about a child's overall functional profile, not just their mobility.

Spastic Diplegia: When Both Legs Are Affected

Understanding CP Types 10 min read

Spastic Diplegia: When Both Legs Are Affected

Q: What is spastic diplegia exactly?

Spastic diplegia is a pattern of cerebral palsy where muscle stiffness, called spasticity, is present mainly in the legs, with the arms and face affected much less or barely at all. It's the most common pattern of cerebral palsy overall, and is classically linked to prematurity, since the nerve fibres controlling the legs pass through the specific area of the brain most vulnerable in babies born very early.

“Will he walk?” is almost always the first question a family asks, and it’s completely understandable why. It’s also the wrong question, or at least an incomplete one, because it flattens a genuinely wide range of real outcomes into a false yes or no. There’s a much better tool for this conversation, and it’s strange how rarely families are actually introduced to it.

Written by CP Clinic Medical Team Tovmed Medical Center, Vinnytsia, Ukraine

Medically reviewed by Prof. Vigein Tovmasian PhD · Orthopedic Surgeon · Honorary Doctor of Ukraine

What spastic diplegia actually is

Spastic diplegia is a pattern of cerebral palsy where spasticity, meaning chronic muscle tightness, is present mainly in the legs, with the arms and face affected much less or barely at all. It’s the single most common pattern of cerebral palsy overall, and it’s classically linked to prematurity, since the nerve fibres controlling leg movement pass directly through the specific area of white matter that’s most vulnerable in babies born very early.

That mechanical explanation matters because it tells you something real: this pattern isn’t random, and understanding it takes away some of the mystery around why your own child’s experience looks the way it does.

Why “will he walk” is the wrong question

Here’s what that binary question misses. A child might walk completely independently. Walk with a visible limp but no assistance needed. Walk using crutches or a walker. Walk short distances at home but need a wheelchair for a full school day or a shopping trip. Or use a wheelchair as the primary way of getting around. Every one of these is a meaningfully different, real situation, and a simple “yes” or “no” answer erases nearly all of that useful detail.

The better question

Not “will he walk,” but “what is his GMFCS level, and what does that actually mean day to day?”

The Gross Motor Function Classification System, or GMFCS, is a five level tool used internationally to describe a child’s typical, real-world movement ability. It focuses especially on sitting, walking, and the use of wheeled mobility, not just a single yes-or-no marker.

The five GMFCS levels, explained

Walks without limitations

Moves freely in most environments without needing assistive devices for basic mobility.

Walks with limitations

Walks independently but may struggle with uneven ground, distances, crowds, or inclines compared to peers.

III

Walks using a hand-held mobility device

Typically uses a walker or crutches to walk, and may use wheeled mobility for longer distances.

Self-mobility with limitations

May use powered mobility; typically transported by others for most distances, with limited independent movement.

Transported in a manual wheelchair

Very limited self-directed movement, even with assistive equipment; requires physical assistance throughout the day.

Exact descriptions are adjusted further by age, since expected abilities differ hugely between a two year old and a twelve year old. Ask your child’s physiotherapist which age-specific version applies.

Nuances worth knowing

GMFCS describes usual performance, not best performance. It’s based on how a child actually functions day to day in real settings like home, school, and the community, not the single best thing they’ve ever managed to do in a clinic. This makes it a more honest, practical description.
Diplegia spans the entire GMFCS range. The diagnosis label “spastic diplegia” tells you which parts of the body are affected, not how significantly. Children with diplegia are found across every level, from I through V, which is exactly why the diagnosis alone can’t answer the walking question, but a GMFCS level genuinely can.
Hand function often doesn’t track leg function in diplegia. Research comparing gross motor function to hand function found that in children with spastic diplegia specifically, hand function tends to be relatively well preserved compared to leg function, the reverse of the pattern typically seen in hemiplegia. Knowing this helps build a fuller picture of a child’s actual profile, not just their mobility.

What treatment connects to this

Since diplegia is fundamentally leg spasticity

Spastic diplegia is, at its core, spasticity concentrated in the legs. This makes it one of the most direct, natural applications of treatments aimed specifically at reducing that spasticity. Minimally invasive procedures such as SFDM (Selective Fibrotomy of Damaged Muscles), available at CP Clinic from age 2 onward, target exactly this kind of leg spasticity, and can be relevant regardless of a child’s specific GMFCS level, since even a child at GMFCS I or II can benefit from reduced tightness, just as much as a child managing a higher support level.

Want to understand your child’s specific pattern, GMFCS level, and what it means for treatment?

Request a free remote evaluation →

Frequently asked questions

What is spastic diplegia exactly?

A pattern of CP where spasticity is present mainly in the legs, with arms and face affected much less. It’s the most common CP pattern overall and is classically linked to prematurity.

Why is “will he walk” the wrong question?

It flattens a wide range of real outcomes into a false yes or no, when actual outcomes range from walking independently to using crutches to needing a wheelchair for longer distances only, to full wheelchair use. Each is meaningfully different.

What is the GMFCS and what does it measure?

The Gross Motor Function Classification System, a five level international tool describing a child’s typical, everyday movement, focused on sitting, walking, and wheeled mobility, based on usual performance in real settings, not best-case performance.

What do the five levels mean?

I: walks without limitations. II: walks with limitations. III: walks using a hand-held mobility device. IV: self-mobility with limitations, may use powered mobility. V: transported in a manual wheelchair. Descriptions adjust by age.

Does diplegia always mean a specific GMFCS level?

No. Diplegia describes which body parts are affected; GMFCS describes how significantly. Children with diplegia span the entire GMFCS range, I through V.

If legs are mainly affected, is hand function normal?

Often relatively well preserved. Research found hand function tends to be relatively better than leg function in diplegia specifically, the reverse pattern from hemiplegia.

References

“Gross Motor Function Classification System.” Wikipedia, summarising Palisano et al. Wikipedia ↗
“Gross Motor Function Classification System – Expanded and Revised (GMFCS–E&R).” Palisano et al., 2007.
“Association between gross motor function (GMFCS) and manual ability (MACS) in children with cerebral palsy. A population-based study of 359 children.” PMC. PMC ↗
“Cerebral Palsy Classifications.” Weinberg Family Cerebral Palsy Center, Columbia University. Columbia ↗

Medical disclaimer: This article is for informational purposes. Your child’s specific GMFCS level and functional classification should be determined by their physiotherapist or specialist through direct assessment.