The Iowa brace

Built by the team at the university where the Ponseti method came from. A fixed 60 degree abduction angle, a bar that does not adjust, and a Flex Bar that gives a little movement and returns to position.

Written by Heath, who has lived it: casts from birth, a fusion at sixteen, the US Army, and distance running.

What it is

A deliberately un-adjustable brace

The Iowa brace was designed by a team of specialists directed by Dr José Morcuende at the University of Iowa. The institution where Ignacio Ponseti developed the method itself1.

Its defining feature is what it does not let you do. The abduction angle is fixed at 60 degrees for the affected ankle, and the bar is not adjustable. It comes in three lengths instead: 8, 10 and 12 inches1.

The connecting bar is called the Flex Bar. It allows limited movement when the child moves the legs, and returns to the set position once the child relaxes1. That is a middle position between a rigid bar and a fully dynamic one like the Dobbs.

Fixed to free

Where the Iowa sits among the bars

Every abduction brace bar sits somewhere between fully fixed and fully free. The Iowa is in the middle on purpose.

A rigid bar

The feet are held at a set angle and move together. The Denis Browne, described in 1931, is the reference design, and Markell shoes are made to fit it.

In the one randomized trial against a newer brace, final Pirani scores came out comparable.

The Iowa Flex Bar

Some movement when the child moves, and a return to the set position when the child relaxes. The angle is fixed at 60 degrees and the bar does not adjust; it comes in 8, 10 and 12 inch lengths instead.

The argument for it: an angle that cannot be adjusted cannot be adjusted wrong between appointments.

A fully dynamic bar

Each leg moves on its own, as with the Dobbs bar. One series reported 7.1 percent non-compliance against 41 percent for a traditional brace.

The price is money and, reportedly, a harder time holding dorsiflexion.

Why fixed

The angle is the treatment, not a setting

An adjustable brace can be adjusted wrong. Sixty degrees of abduction is what the protocol calls for on the affected side, and a fixed angle removes the possibility of it drifting between appointments. At the cost of needing the right bar length rather than adjusting the one you have1.

That trade is the whole design philosophy. It is the opposite of the argument behind dynamic bars, which prioritize what the child will tolerate.

What the Iowa group found about bracing generally

Compliance, and the thing braces do not do

The Iowa group is also the source of some of the most quoted findings about bracing itself.

A study of 20 children over an average bracing period of 33 months looked at whether the brace was doing harm as well as good. It found femoral anteversion on the affected side averaging 40.5 degrees and tibial external torsion 38.4 degrees, both within the normal range, with average ankle dorsiflexion of 27.5 degrees. The conclusion was that brace use did not produce pathological changes in femoral anteversion or tibial torsion2.

What that means. The common parental worry. That holding a baby’s feet turned out for years will twist the legs. Was not borne out in that series.

What it might mean. Twenty children is small, and 19 of them were compliant, which is far above the roughly one-third non-compliance seen in larger cohorts3. A compliant sample may not tell you what happens in a typical one.

Iowa brace

What is the Iowa brace?

A foot abduction brace designed by a team led by Dr José Morcuende at the University of Iowa, where the Ponseti method originated. It has a fixed 60 degree abduction angle and a non-adjustable bar supplied in three lengths: 8, 10 and 12 inches.

Why is the Iowa bar not adjustable?

Because the abduction angle is part of the treatment rather than a comfort setting. A fixed angle cannot drift between appointments. The trade is that you need the correct bar length rather than adjusting the one you already have.

What is the Flex Bar?

The Iowa connecting bar. It gives limited movement when the child moves their legs and returns to the set position when they relax. A middle position between a rigid bar and a fully dynamic one.

Does a foot abduction brace twist a child’s legs?

It did not in one Iowa series of 20 children braced for an average of 33 months. Femoral anteversion averaged 40.5 degrees and tibial external torsion 38.4 degrees, both within normal range, and the authors concluded the brace produced no pathological torsional change.

Is the Iowa brace better than a dynamic bar?

Nobody has compared them directly. They embody opposite philosophies. The Iowa fixes the angle so it cannot be got wrong, dynamic bars prioritize what a child will tolerate.

Sources

Where this comes from

1 Current concepts on bracing in the Ponseti methodMasquijo JJ, Allende V. Revista de la Asociación Argentina de Ortopedia y Traumatología, 2023;88(2):218 to 223 2 Foot abduction brace in the Ponseti method: torsional deformities and complianceBoehm S et al. Journal of Pediatric Orthopaedics, 2007 Sep;27(7). PMID 17717477 3 Pressure sores and bracing complications in idiopathic clubfootKollias CM et al. Prosthetics and Orthotics International, 2026. PMID 42149778

Figures on this page are quoted from the studies cited above and are not this site’s own measurements. Series are small and mostly retrospective, so treat them as a starting point for a conversation with your clinic rather than a verdict on any brace.

All nine designs compared, or the bracing schedule if the hours are the problem rather than the hardware.