Why the Ponseti method works

If you want the week-by-week, that lives in the casting schedule and the bracing guide. This page is for the question underneath those: why is it done this way, when it looks so slow and so low-tech?

For much of the twentieth century, serious clubfoot (talipes equinovarus, CTEV) meant an operation. The standard was an extensive soft-tissue release. Cutting through the tight structures at the back and inside of the foot to force it into alignment. It worked, in the sense that the foot looked corrected afterward.

The problem took twenty years to appear. Those feet became stiff. Scar tissue does not behave like the tissue it replaced, and adults who had extensive releases as babies turned up with pain, rigidity, weakness and arthritis at ages when they should have been fine. The correction had held; the foot had not.

Ignacio Ponseti, a Spanish-born surgeon at the University of Iowa, had been publishing a non-surgical alternative since the 1940s. It was largely ignored while surgery was ascendant. It became the world standard only once long-term outcome data made the comparison impossible to argue with.

The insight is almost embarrassingly simple, and it is biological rather than surgical. Newborn ligament and tendon respond to gentle sustained tension by lengthening and remodeling. Not stretching in the moment: actually reorganizing, over days, into a new resting length.

So the treatment does not force anything. Each cast holds the foot at the limit of where it comfortably reaches, and the tissue quietly rebuilds itself at that new length over the following week. The next cast starts from the position the tissue has accepted, and asks for a little more.

This is why the casts are not tight1, why the manipulation is gentle, and why the intervals are weekly and not daily. You cannot rush a biological process by squeezing harder. It is also why treatment usually starts within weeks of birth, while the tissue is most responsive, although a 2026 review found that starting after four weeks gave similar relapse and tenotomy rates.3

That last row is the reason the tenotomy sits near the end, and why it is not a sign anything went wrong. See the tenotomy page for what that step involves.

Here is the part most descriptions underweight. Ponseti did not only work out how to correct a clubfoot. He worked out that correction alone does not last.

A corrected clubfoot has a real tendency to drift back toward its original shape as the child grows. Casting achieves the correction in a matter of weeks; bracing is what carries it through years of growth. The brace is not aftercare bolted onto the end of a treatment. It is the second half of the method, and it is where outcomes are actually won and lost.

Which is why the demanding, unglamorous, mostly-at-home brace phase gets treated on this site with the same seriousness as the clinical part. Relapse prevention is not a separate topic from Ponseti treatment. It is the point of it.