Also found in: Dictionary, Thesaurus, Idioms, Encyclopedia, Wikipedia.


a condition in which one or more arches of the foot have flattened out; called also pes planus, pes valgus, platypodia, and tarsoptosis.

pes pla·'nus

a condition in which the longitudinal arch is broken down, the entire sole touching the ground.
Synonym(s): flatfoot, talipes planus


/flat·foot/ (flat´foot) a condition in which one or more arches of the foot have flattened out.


1. pl. flat·feet (-fēt′) A condition in which the arch of the foot is abnormally flattened down so that the entire sole makes contact with the ground.
2. pl. flat·foots
a. Informal A person with flat feet.
b. Slang A police officer.
intr.v. flat·footed, flat·footing, flat·foots
To walk in a flat-footed manner: "He flatfooted along, twirling his club" (James T. Farrell).


an abnormal but relatively common condition characterized by the flattening out of the arch of the foot. Also called pes planus. See also fallen arch.
enlarge picture

tal·i·pes pla·nus

(tal'i-pēz plā'nŭs)
A condition in which the longitudinal arch is broken down, the entire sole touching the ground.
Synonym(s): flatfoot, pes planus.


Enlarge picture
Abnormal flatness of the sole and the arch of the foot. This condition may exist without causing symptoms or interfering with normal function of the foot. The inner longitudinal and anterior transverse metatarsal arches may be depressed. This condition may be acute, subacute, or chronic. Synonym: pes planus; splayfoot See: illustration

spasmodic flatfoot

Flatfoot in which the foot is held everted by spasmodic contraction of the peroneal muscle.

Patient discussion about flatfoot

Q. Can flat feet be repaired by surgery? I have flat feet and I’m looking for all sorts of treatments for it- I heard there is a surgery for it- is it helpful?

A. As far as I know- they don’t treat flat feet that are asymptomatic. So first of all check if it bothers you. secondly there are 2 kinds of flat feet- rigid and flexible. There are different and treated differently. Not always a surgery (which is very painful and costly) is needed– I went to a Rolf method therapist by the advice of my orthopedic and it’s much better now. Ask an orthopedic.

Q. I think my son has flat foot, how to tell for sure? I didn't notice it before, he is 3 years old now and all shoes hurt him. Does it mean he has flat foot? what else can it be?

A. Pes planus (flat foot) is not a rare condition in toddlers, and may resolves spontaneously as the child grows. It is diagnosed clinically, i.e. by a doctor such as pediatrician or pediatric orthopedic surgeon, and radiographs are not universally indicated

More discussions about flatfoot
References in periodicals archive ?
Relationship of flatfoot and high arch with main anthropometric variables.
The correlation between footprint and radiographic measurements in flatfoot.
Corrective shoes and inserts as treatment for flexible flatfoot in infants and children.
Results evaluation of children flexible flatfoot operative treatment according to mittelmeier method.
Table 3 shows the findings of the Denis classification per age group with significant differences between the 3- to 5-year-old group and the older children, and there was only one patient with flatfoot Denis (3).
Hence Flatfoot is extremely entertaining because of the original humor emphasized by these double effects and the added level of comment.
The research will continue also for human subjects with some disabilities, like flatfoot and stability or locomotion diseases.
Kisses I can manage," he said, "but when it comes to dancing I'm more of a Flatfoot than a Flatley.
Unlike Bochco's current hit, ABC's ``NYPD Blue,'' ``Brooklyn'' will focus on uniformed flatfoots, not detectives.
Justice was meted out on the street by tough, no-nonsense flatfoots who spoke softly and carried big guns.