Post 50: When AFOs and Floor Play Don't Mix — What's Happening Inside the Knee
You've probably seen it a hundred times. Your child is on the floor, happily playing, and their AFOs are still on because — honestly — it didn't seem like a big deal.
I want to talk about that moment. Not with alarm, and not with blame. But with information I think every parent who uses AFOs deserves to have.
Because there's a specific combination — AFOs on, child on the floor in kneeling or W-sitting — that creates something worth understanding. And once you understand it, a very simple change becomes easy to make.
First: Let's be clear about W-Sitting.
If you've read Post 24, you already know that I don't fear W-sitting. I don't ban it, and I don't think parents need to police it.
W-sitting is often a smart, adaptive choice. It gives children a wide, stable base when their trunk control is still developing. It frees the hands for play. It fits many children's hip orientation naturally. The body chooses it because it works — and I respect that.
So this post is not about W-sitting being wrong.
This post is about what happens when your child W-sits — or kneels — with their AFOs on.
That combination is different. And it matters.
What AFOs Do to the Foot on the Floor
As I explored in Post 23, AFOs hold the foot and ankle at a fixed position — typically 90 degrees. That's exactly what they're designed to do during standing and walking, where that external support serves a purpose.
But on the floor, the situation changes completely.
When your child is upright, the foot can still interact with the ground — absorbing forces, distributing load, making small adjustments. Even inside the brace, there's some room for the body to respond.
When your child is on the floor — kneeling, W-sitting, or crawling — the foot is now pressed against the ground at a fixed angle. And because the AFO locks it firmly, the foot can no longer do what it would naturally: pronate slightly, supinate, roll, shift, adapt.
The foot is stuck. It cannot respond.
And when the foot can't move, the forces that would normally travel through it have to go somewhere else.
What Happens Inside the Knee
When the knee bends into flexion — as it does in kneeling and W-sitting — the internal environment of the joint shifts. The ligaments change their tension. The menisci reposition. Everything adapts to that bent angle.
In a freely moving body, this works as it should. The knee bends, the foot below it adjusts, the hip accommodates — the whole chain moves together.
But when the foot is locked inside the AFO and pressed against the floor, that chain is interrupted.
The body above keeps moving — your child shifts weight, reaches for a toy, turns to look at something. All of that motion creates forces that travel down through the knee.
At the bottom of the chain, the foot has nowhere to go.
So the forces converge at the knee.
The Torque Problem
Here is the core of what I want you to understand.
When your child moves — even small, natural play movements — while their foot is fixed against the floor, a rotational stress builds inside the knee. The lower leg is caught between the motion of the body above and the immovable foot below.
This is what we call torque: a twisting force at the joint.
Think of it like holding a wet cloth at both ends and gently twisting in opposite directions. Now imagine that happening, softly but repeatedly, inside a knee that is already in a flexed, vulnerable position.
For children with cerebral palsy — who often have altered tone, different fascial tension patterns, or reduced sensory feedback at the joint — this kind of rotational load matters more, not less.
The joint capsule, the ligaments, the fascia surrounding the knee are all absorbing forces they weren't designed to manage in that combination. Not dramatically. Not in a single play session. But consistently, over days and weeks, it adds up.
As I wrote in Post 23: when movement is blocked at one point, the tension doesn't disappear. It travels. The foot can't express it, so it moves upward — to the knee, the hip, the pelvis.
Kneeling and W-Sitting With AFOs: Why the Combination Is the Problem
Without AFOs, W-sitting and kneeling are positions the body can navigate. The foot is free to respond to the surface, to shift slightly, to absorb the rotational forces that come with movement. The chain stays flexible.
With AFOs, the foot becomes a fixed lever. And a fixed lever attached to a flexed, moving knee creates strain that a free foot would simply distribute and release.
Crawling with AFOs brings the same issue in motion. With every cycle of movement, the foot pushes against the floor — but inside the brace, it cannot adapt to the surface or the direction of travel. The AFO creates rigidity exactly where the body needs responsiveness.
This is not a reason to fear the floor. Floor time is wonderful for children with CP — it's full of proprioceptive input, movement exploration, and fascial nourishment. The floor is not the problem. The fixed foot on the floor is.
Two Simple Solutions
Once you understand what's happening, the answer is straightforward — and easy to fit into real family life.
Option 1: Remove the AFOs for floor play.
Floor time is one of the best opportunities for your child's feet to move freely. Without the brace, the foot can pronate, supinate, and respond to the ground naturally. Those small movements feed the fascia — exactly as we want.
You don't need AFOs for floor time. The ground is providing the contact. Let the feet be free.
Option 2: If the AFOs need to stay on — elevate the surface.
Sometimes there's a clinical reason the AFO stays on, or removing and replacing it multiple times isn't practical in your day. In that case, a small elevation under the knee or shin — a folded blanket, a thin foam pad — can lift the foot off the ground just enough. The foot is no longer a fixed point pressing into the floor. The torque at the knee is reduced. The position becomes much safer.
It doesn't need to be perfect. It just needs to interrupt that locked-foot-on-floor dynamic.
What This Looks Like in Real Life
You don't need to overhaul your routine. Just build one simple habit:
Before floor time — AFOs come off.
Make it a transition ritual. AFOs on for walking and standing activities. AFOs off when your child goes to the floor to play, explore, or rest. That one shift protects the knee and gives the foot the movement it needs.
And if your child is in a kneeling position with AFOs on at therapy, at school, or at home — a small rolled towel or foam wedge under the shin is enough to make a difference.
Small changes. Applied consistently. That is what feeds the fascia and protects the joints.
You're already doing more than you know.
If you're reading this, you're already paying attention to things most people never think about. That awareness — that curiosity about what's really happening inside your child's body — is one of the most powerful things you can bring to their development.
You don't need to do everything perfectly. You just need to keep learning, keep asking, and keep making small, informed choices.
That's exactly what this is.
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