What the sonographer saw

One image where the sole of the foot and the bones of the lower leg appear together. On a normally aligned foot, you cannot get both in the same picture.

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

It is a strangely simple thing to have changed your afternoon. A foot pointing forward can be photographed from the side, showing the shin, or from below, showing the sole, but not both at once. When a foot is turned in and down, both views line up, and the sonographer gets a picture that should not exist.

That is the finding. Everything after it is about what that picture can and cannot tell you.

Where you are in the pregnancy

What a scan can see changes considerably with gestation. Move through the weeks.

Rarely found here

Formed, but very small

The feet exist and are fully formed by this stage, but they are tiny and the resolution needed to judge their angle reliably is not there yet. Clubfoot is occasionally suspected at a twelve-week scan, usually when it is severe or when someone is looking specifically because of family history.

A normal-looking scan at this stage tells you very little either way. Nobody is expecting to find clubfoot (club foot, or talipes equinovarus) here, so nobody has ruled it out.

Where it is usually found

The anomaly scan

This is the one. The feet are big enough to assess, there is still room for the baby to move into viewable positions, and the sonographer is systematically checking limbs. The overwhelming majority of prenatal clubfoot findings happen here.

You will usually be told it is suspected, not confirmed, and that wording is accurate and not cautious. A scan genuinely cannot confirm it. Expect to be offered a follow-up scan, and expect the wider check for anything else to matter as much as the feet themselves.

Confirming or revising

The follow-up look

A second scan does two jobs. It looks again at the feet, sometimes with better views than the first attempt got, and it checks everything else, because clubfoot occasionally travels with other findings, and separating isolated from syndromic clubfoot changes what happens next far more than the feet do.

Findings do change at this stage. A foot flagged at twenty weeks sometimes looks entirely normal now, and occasionally the reverse.

Harder to read

Running out of room

Late scans are less useful for feet, not more. The baby is large, space is tight, and a foot pressed into a corner can look turned when it is not, which is exactly the crowding that produces a genuinely positional foot after birth.

So a late scan that looks worrying is weaker evidence than a twenty-week one, not stronger. If you are being told something new at this stage, it is reasonable to ask how confident the view was.

The actual diagnosis

Someone holds the foot

This is where it is settled, and it takes about a minute. A clinician moves the foot toward a corrected position and feels what it does. A foot that comes round easily was positional, a foot that resists and springs back is clubfoot.

Everything the scans could not tell you comes from that. Whether it is real, how stiff it is, what the score is, and what the treatment plan looks like. The full detail is in positional or the real thing.

What a scan cannot tell you

Question	Can the scan answer it?
Is the foot turned?	Yes. This is what it sees well
One foot or both?	Usually yes
Is anything else going on?	Often . And this is the more important check
Is it actually clubfoot?	No. Stiffness cannot be seen
How severe is it?	No. Severity is scored by handling the foot
How long will treatment take?	No. Nothing on a scan predicts cast count

The bottom three rows are where most of the worry sits, and a scan is silent on all of them. A picture that looks dramatic on screen has no bearing on how the treatment goes.

The useful thing to do with the waiting

Find a Ponseti-trained provider and get the referral arranged before the birth. Treatment starts within the first weeks, and families who sort this in advance simply begin on time instead of spending the first two weeks on the phone. How to check someone is genuinely Ponseti-trained.

Clubfoot on a scan

Can an ultrasound confirm clubfoot?

No. A scan shows shape, and the diagnosis depends on stiffness, whether the foot resists being moved. That can only be assessed by hand after birth, which is why a prenatal finding is always described as suspected.

Can the scan tell how severe it is?

Not reliably. Severity is graded by how the foot behaves under examination using the Pirani or Dimeglio scores, and neither can be applied to an image. A dramatic-looking scan does not predict a difficult treatment.

Can they see if both feet are affected?

Usually yes, and it is one of the more reliable things a scan does tell you. Both feet are checked, though a foot tucked into an awkward position can be difficult to view properly.

Will I need more scans?

Commonly yes. A follow-up usually looks again at the feet and checks for anything else, since clubfoot is occasionally part of a wider picture. That wider check is often the more important purpose.

Does it change the birth?

Not usually. Clubfoot on its own does not affect delivery mode, timing or place of birth. What it changes is preparation. You can arrange the orthopedic referral before your baby arrives.

Should we do anything before the birth?

Find a Ponseti-trained provider and get a referral in place. Treatment starts within the first weeks, and families who arrange this in advance lose no time waiting for an appointment afterward.

What does clubfoot look like on an ultrasound?

The classic sign is seeing the sole of the foot in the same image as the two long bones of the lower leg. On a normally aligned foot those views cannot be captured together, so that single picture is what prompts the conversation.

At what week is clubfoot usually seen?

Most often at the 18 to 22 week anomaly scan, when the feet are large enough to assess and there is still room to see them clearly. It is occasionally suspected earlier and sometimes not picked up at all.

Does a prenatal diagnosis change the birth?

Not usually. Clubfoot on its own does not affect delivery mode, timing or place of birth. What it changes is preparation. You can arrange the orthopedic referral before your baby arrives.

Sources

Where this comes from

1 Diagnosis and treatment of idiopathic congenital clubfootAmerican Academy of Pediatrics 2 Clubfoot diagnosis and treatment for babiesAAP HealthyChildren 3 Clubfoot diagnosis and treatment overviewMayo Clinic 4 Clubfoot overviewCleveland Clinic 5 Clubfoot overview and treatment contextAAOS OrthoInfo

After the scan

Could it be wrong? →How often scans get this wrong, in both directions. What clubfoot is →The condition itself, if this is new to you. What treatment looks like →The six stages, so you know what is coming.