Posterior Leaf Spring (PLS) AFOs for Kids: A Lightweight Option

A posterior leaf spring (PLS) AFO is a slim, flexible brace with a narrow strip running up the back of the ankle. That "leaf" flexes as the child walks and springs back to lift the foot, preventing it from dropping during the swing phase. It's one of the lightest, lowest-profile AFOs.

Who it's for

An orthotist may prescribe a PLS for a child with isolated foot drop - weak dorsiflexors but little or no spasticity - who needs help clearing the toe when stepping through, without the rigidity of a solid brace. Because it flexes, it preserves a more natural gait.

What to look for in a shoe

A PLS is slimmer than a solid or hinged AFO, but it still runs up the back of the heel and needs room there.

• An opening that clears the heel so the posterior strut isn't forced past the collar.
• A removable insole for a little extra depth.
• A secure closure so the foot stays seated against the brace.

How BILLY fits a PLS AFO

The zip-around opening makes seating a posterior strut simple - fold the upper open, set the heel in, zip. The Classic D|R II, with its Achilles notch and deeper heel, is a comfortable match, and many PLS users also do well in standard BILLY high-tops thanks to the wide opening. Match the width to your child's foot.

Shop and learn more

Find styles in Kids' AFO Shoes, compare with solid AFOs, and see our AFO shoe-fitting guide. Your orthotist determines whether a PLS is right - it isn't suited to strong spasticity.