equinovarus

内反尖足

関

clubfoot、talipes equinovarus

WordNet

1. congenital deformity of the foot usually marked by a curled shape or twisted position of the ankle and heel and toes (同)talipes

PrepTutorEJDIC

1. 内反足,えび足 / 〈U〉内反足である状態

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/15 18:58:15」(JST)

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For other uses, see Club foot (disambiguation).

Club foot
Bilateral club foot
Classification and external resources
Specialty	Orthopedics
ICD-10	M21.5, Q66.8
ICD-9-CM	736.71, 754.5-754.7
OMIM	119800
DiseasesDB	29395
MedlinePlus	001228
eMedicine	radio/177 orthoped/598
MeSH	D003025

Club foot or clubfoot, also called congenital talipes equinovarus (CTEV), is a congenital deformity involving one foot or both. The affected foot appears to have been rotated internally at the ankle. Without treatment, people with club feet often appear to walk on their ankles or on the sides of their feet. However, with treatment, the vast majority of patients recover completely during early childhood and are able to walk and participate in athletics just as well as patients born without CTEV.

It is a relatively common birth defect, occurring in about one in every 1,000 live births. Approximately half of people with clubfoot have it affect both feet, which is called bilateral club foot. In most cases it is an isolated disorder of the limbs. It occurs in males twice as frequently as in females.

A condition of the same name appears in some non-human animals, particularly horses, though in that particular case it is more akin to stepping en pointe than sideways.

Genetics

Hippocrates around 400 B.C. was the first to offer a medical explanation, and to this day there are many hypotheses about how clubfoot develops, involving environmental factors, genetics, or a combination of both. No study has pinpointed the root cause, but most findings agree that "it is likely there is more than one different cause and at least in some cases the phenotype may occur as a result of a threshold effect of different factors acting together."

Some researchers hypothesize, from the early development stages of humans, that clubfoot is formed by a malfunction during gestation. Amniocentesis is believed to increase the rates of this deformity because there is an increase in possible amniotic leakage during the procedure. Underdevelopment of the bones and muscles in the embryonic foot may be another underlying cause. Underdevelopment prevents the fetus's foot from rotating medially, leaving it in the club formation after birth. It was widely believed in the early 1900s that constriction of the foot by the uterus contributed to clubfoot.

Underdevelopment of the bones also affects the muscles and tissues of the foot. Abnormality in the connective tissue causes "the presence of increased fibrous tissue in muscles, fascia, ligaments and tendon sheaths". Affected individuals have smaller than normal legs even after corrected. Further evidence shows that mutations in genes involved in muscle development are risk factors for clubfoot, specifically those encoding the muscle contractile complex (MYH3, TPM2, TNNT3, TNNI2, and MYH8). These can cause congenital contractures, including clubfoot, in distal arthrogryposis (DA) syndromes.

Modern advances in genetic mapping techniques and the development of models of the disease in mice have improved understanding of developmental processes. Studies of genetic epidemiology have led to a more recent hypothesis on the etiology of clubfoot: its inheritance pattern is explained as a heterogenous disorder using a polygenic threshold model. The PITX1-TBX4 transcriptional pathway has become key to the study. PITX1 and TBX4 are uniquely expressed in the hind limb. Further studies duplicating this pathway in models need to be conducted to hopefully find what genetic abnormalities cause clubfoot.

Diagnosis

Clubfoot is usually diagnosed immediately after birth simply by looking at the foot. It is then up to the doctor whether or not to x-ray the foot or feet to examine how the internal structures are positioned. In some cases, it may be possible to detect the disease prior to birth during the ultrasound. It may be more prominent if both feet are affected. The ability to possibly identify clubfoot before live birth can prove beneficial to the child as different treatments can be explored.

Treatment

A foot abduction brace type Denis Browne bar. Various types of foot-abduction braces are used to hold the child's feet in the desired position.

Clubfeet in the course of correcting

Once a child has been diagnosed with clubfoot, there are many different treatment approaches. Treatment should be given immediately after diagnosis to take full advantage of the flexibility in the baby’s bones and joints. This allows for improved manipulation to try to achieve a normal foot. The Ponseti method appears to result in better outcomes than the Kite method and similar outcomes to a traditional technique.

This involved manipulation by people specialized in the technique with serial casting and then providing braces to hold the feet in a plantigrade position. After serial casting, a foot abduction brace such as a Denis Browne bar with straight lace boots, ankle foot orthoses and/or custom foot orthoses (CFO) may be used. In North America, manipulation is followed by serial casting, most often by the Ponseti method. Foot manipulations usually begin within two weeks of birth.

French method

The French method, also known as the "functional method" or "physiotherapy method", is easiest to do with young bones. The child's foot is gradually stretched to achieve the right position, being held in place with tape after stretching. In the evening, the child’s foot is hooked up to a machine where it continuously moves the foot while the child sleeps. This method is not the most widely used, as it is very time consuming.

Extensive surgery of the soft tissue or bone is not usually necessary to treat clubfoot; however, there are two minimal surgeries that may be required:

1. Tenotomy - clipping of the Achilles tendon – is needed in about 80% of cases.
2. Anterior tibial tendon transfer, in which the tendon is moved from the first toe to the third in order to release the inward traction on the foot, is needed in about 20% of cases.

In most cases extensive surgery is not needed to treat clubfoot. Extensive surgery may lead to scar tissue developing inside the child's foot. The scarring may result in functional, growth and aesthetic problems in the foot because the scarred tissue will interfere with the normal development of the appendage. A child who has extensive surgery may require on average two additional surgeries to correct the issues presented above.

In stretching and casting therapy the doctor changes the cast several times over a few weeks, gradually stretching tendons until the foot is in the correct position of external rotation. The heel cord is released (percutaneous tenotomy) and another cast is put on, which is removed after three weeks. To avoid relapse a corrective brace is worn for a gradually reducing time until it is only at night up to four years of age.

Ponseti method

Sketch of foot positioning by means of a foot abduction brace

This treatment requires stretching. The foot is repositioned to the normal position then a cast (the "Ponseti cast") is placed on top of it. The baby’s foot is then continually repositioned and placed back into a cast once a week for several months. Towards the end of the process after being in a cast, the doctor will then surgically lengthen the heel cord (aka Achilles tendon). After the foot has been realigned, maintenance involves routine stretching. The child also has to wear special shoes or braces full-time for three months, then just nightly for three years. This method can be compared to wearing braces on your teeth. Parents have to follow the doctor’s orders for when to wear and not wear the brace to keep the foot corrected. Failure will occur if the brace is not worn and the foot will return to its odd shape.

Treatment for clubfoot should begin almost immediately to have the best chance for a successful outcome without the need for surgery. Over the past 10 to 15 years, more and more success has been achieved in correcting clubfeet without the need for surgery. The clubfoot treatment method that is becoming the standard in the U.S. and worldwide is known as the Ponseti method. Foot manipulations differ subtly from the Kite casting method which prevailed during the late 20th century. Although described by Dr. Ignacio Ponseti in the 1950s, it did not reach a wider audience until it was re-popularized around 2000 by Dr. John Herzenberg in the USA and in Europe and Africa by NHS surgeon Steve Mannion while working in Africa. Parents of children with clubfeet using the Internet also helped the Ponseti gain wider attention. The Ponseti method, if correctly done, is successful in >95% of cases in correcting clubfeet using non- or minimal-surgical techniques. Typical clubfoot cases usually require five casts over four weeks. Atypical clubfeet and complex clubfeet may require a larger number of casts. Approximately 80% of infants require an Achilles tenotomy (microscopic incision in the tendon requiring only local anesthetic and no stitches) performed in a clinic toward the end of the serial casting.

After correction has been achieved, maintenance of correction may require the full-time (23 hours per day) use of a splint—also known as a foot abduction brace (FAB)—on both feet, regardless of whether the TEV is on one side or both, for several weeks after treatment. Part-time use of a brace (generally at night, usually 12 hours per day) is frequently prescribed for up to four years. Without the parents' participation, the clubfoot will almost certainly recur, because the muscles around the foot can pull it back into the abnormal position. Approximately 20% of infants successfully treated with the Ponseti casting method may require a surgical tendon transfer after two years of age. While this requires a general anesthetic, it is a relatively minor surgery that corrects a persistent muscle imbalance while avoiding disturbance to the joints of the foot.

The long-term outlook for children who experienced the Ponseti method treatment is comparable to that of non-affected children.

Botox is also being used as an alternative to surgery. Botox is the trade name for Botulinum Toxin type A, a chemical that acts on the nerves that control the muscle. It causes some paralysis (weakening) of the muscle by preventing muscle contractions (tightening). As part of the treatment for clubfoot, Botox is injected into the child’s calf muscle. In about one week, the Botox weakens the Achilles tendon. This allows the foot to be turned into a normal position over a period of 4–6 weeks, without surgery.

The weakness from a Botox injection usually lasts from 3–6 months. (Unlike surgery, it has no lasting effect). Most club feet can be corrected with just one Botox injection. It is possible to do another if it is needed. There is no scar or lasting damage.

Surgery

In severe cases, surgery may be the only option to correct the foot after trying all other non-invasive methods for treatment. Surgery does not ensure full recovery, but most babies who underwent the surgery have maintained their normal feet. A surgeon will go in and lengthen the muscles and tendons to ease the foot into position. After surgery when the cast is removed, a brace is to be worn to prevent the foot from returning to the old position.

On occasion, stretching, casting and bracing are not enough to correct a child's clubfoot. Surgery may be needed to adjust the tendons, ligaments and joints in the foot/ankle. Usually done at 9 to 12 months of age; surgery usually corrects all clubfoot deformities at the same time. After surgery, a cast holds the clubfoot still while it heals. It is still possible for the muscles in the child's foot to try to return to the clubfoot position, and special shoes or braces will likely be used for up to a year or more after surgery. Surgery will likely result in a stiffer foot than nonsurgical treatment, particularly over time.

Without any treatment, a child's clubfoot will result in severe functional disability, however with treatment, the child should have a nearly normal foot. He or she can run and play without pain and wear normal shoes. The corrected clubfoot will still not be perfect, however; a clubfoot usually stays 1 to 1½ sizes smaller and somewhat less mobile than a normal foot. The calf muscles in a leg with a clubfoot will also stay smaller.

Long-term studies of adults with post-club feet, especially those with substantial numbers of surgeries, may not fare as well in the long term, according to Dobbs, et al., A percentage of adults may require additional surgeries as they age, though there is some dispute as to the effectiveness of such surgeries, in light of the prevalence of scar tissue present from earlier surgeries.

In some cases the leg stops developing earlier than the healthy leg and a substantial length difference may occur. In some cases a leg lengthening will be necessary, most commonly by use of the Ilizarov method.

History

Treatment of clubfoot is evident as early as Egyptian paintings. In early days, the foot was manipulated with a Thomas wrench and casting which caused fracture of several bones in the foot.

Notable cases

The club-foot, by José de Ribera, in fact, a hemiplegia

Famous storyteller from Lapland. Juho "Nätti-Jussi" Nätti (surname can be translated as "pretty") who lived 1890-1964, was known for his stories but also his untreated left club foot. A story tells that "not even the devil himself could tell which way Nätti has gone" from the footprints on snow.

Many notable people have been born with one or both feet in "clubbed" condition, including Roman emperor Claudius, statesman Prince Talleyrand, 19th-century American politician Thaddeus Stevens, comedian Damon Wayans, actor Gary Burghoff, and Eric The Midget from The Howard Stern Show, football players Steven Gerrard and Miguel Riffo, sledge hockey player Matt Lloyd, a Paralympian, mathematician Ben Greenberg, and filmmaker Jennifer Lynch.

While the British Romantic poet George Gordon, Lord Byron was wrongly said to suffer from clubfoot, he did suffer from a similar condition, tendon achillies, which caused him much humiliation.

Comedian, musician, and actor Dudley Moore was born with a club foot. This was mostly unknown to the public as he wore one shoe with a slightly bigger sole to compensate when walking.

NFL Cornerback Charles Woodson was born with severely clubbed feet and went on to win the Heisman Award at the University of Michigan, played in Super Bowl XXXVII with the Oakland Raiders and won Super Bowl XLV with the Green Bay Packers.

The figure-skater Kristi Yamaguchi was born with a clubfoot, and went on to win gold medals at both the 1992 Winter Olympics and World Championships. The soccer star Mia Hamm was born with the condition and won Gold twice with Team USA in the 1996 Olympics and in the 2004 Olympics. Baseball pitcher Larry Sherry, the 1959 World Series MVP, was born with club feet, as was pitcher Jim Mecir, and both enjoyed long and successful careers. In fact, it was suggested in the book Moneyball that Mecir's club foot contributed to his success on the mound; it caused him to adopt a strange delivery that "put an especially violent spin" on his screwball, his specialty pitch. The San Francisco Giants held the record as the team with the all-time highest number of players with clubbed feet as of July 2010, and Freddy Sanchez, one of its infielders, cites his ability to overcome the defect as a reason for his success. Tom Dempsey of the New Orleans Saints, born with a right club foot and no toes (this was his kicking foot), kicked an NFL record 63-yard (58 m) field goal. This kick became famous as the longest NFL field goal in history. Former NFL quarterback Troy Aikman beat being born with a clubfoot to enjoy a productive Hall of Fame career with 3 Super Bowl Rings in Super Bowl XXVII, Super Bowl XXVIII, and Super Bowl XXX. Despite a club foot, Michael Houser, goaltender for the London Knights of the Ontario Hockey League, won the Red Tilson Trophy as the most outstanding player in the OHL in 2011-2012. He was signed by the National Hockey League's Florida Panthers in July, 2012.

National Socialist and government official in Poland, Austria and Netherlands, Arthur Seyss-Inquart, lived his life walking with a clubfoot, and was still limping on it when he arrived at the gallows and was hanged as the last condemned prisoner at The Nuremberg Trials on October 16, 1946. Nazi Propaganda Minister Joseph Goebbels had a deformity caused by a botched operation for the bacterial infection osteomyelitis, which some mistook for clubfoot.

De Witt Clinton Fort, who served in the Confederate Army as a captain, was born with a clubfoot, and he was known during the American Civil War as Captain "Clubfoot" Fort, C.S.A.

Egyptian pharaoh Tutankhamun had a club foot and a cleft palate, and it is likely that he needed a cane to walk.

In literature

• The main character, Philip Carey, in W. Somerset Maugham's novel Of Human Bondage, has a club foot, a central theme in the work.
• Hippolyte Tautain, the stable man at the Lion D'Or public house in Gustave Flaubert's novel Madame Bovary is unsuccessfully treated for clubfoot by Charles Bovary, leading to the eventual amputation of his leg.
• Charlie Wilcox, the main character in Sharon McKay's novel Charlie Wilcox had a club foot.
• In Yukio Mishima's seminal novel The Temple of the Golden Pavilion the character Kashiwagi has club feet which parallels the stutter of the main character, Mizoguchi.
• In David Eddings' Malloreon series, Senji the sorcerer has a club foot.
• In Caroline Lawrence's Roman Mysteries series, a character called Vulcan the blacksmith appears in the book "The Secrets of Vesuvius". He reveals that he gained the nickname because of his club foot.
• In Bernard Cornwell's The Warlord Chronicles Mordred, King of Dumnonia, has a club foot that is often used as a symbol for his ugliness and weakness as a ruler.
• In Daniel Keyes's Flowers for Algernon Gimpy, one of Charlie's co-workers at the bakery, has a club foot.
• In Perfume: The Story of a Murderer, the main character is born with a club foot and is described as having a limp throughout the novel.
• In Flannery O'Connor's short story "The Lame Shall Enter First", the character Johnson has a club foot, a major symbol within the story.

Other animals

Severe club foot in a pony, probably congenital in origin

Apparent club foot, thought to be from post-natal environmental conditions, not congenital

Left hoof normal, right hoof possible grade one club foot

Club feet occur in other animals, notably equines. The condition is characterized by a strongly upright pastern and a corresponding rotation of the coffin bone in the hoof. The condition often affects only one foot. Severity varies, with some animals usable for work or riding, and others unsound for life. Careful farrier work on the hooves can lessen the severity of many cases, and in certain circumstances surgery may be beneficial. The visible outward appearance of a club foot has different possible origins that include a genetic predisposition to the condition, a congenital defect formed while the animal is in the womb, or problems with diet and bone development during the early post-natal period. Certain horse breeds appear to be more predisposed to the condition than others, but research has yet to identify the genes involved.

A grading scale exists to assess the severity of club feet, which are caused by a deep digital flexor contraction syndrome. When the muscle fibers of the upper leg's deep digital flexor muscle contract excessively, this affects the tendon of the same name that inserts into this muscle group and attaches at the bottom of the coffin bone. A constant upward pull by the tendon on the coffin bone and other structure of the horse's hoof creates the condition. While many young foals are born with somewhat upright pasterns, the condition may resolve naturally or with minimal intervention if begun early. However, some cases are so severe that more drastic treatment may be required.

References

UpToDate Contents

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• 1. 内反尖足（内反足）の出生前診断 prenatal diagnosis of talipes equinovarus clubfoot
• 2. 新生児における出産時の損傷 lower extremity positional deformations
• 3. 内旋歩行の小児に対するアプローチ approach to the child with in toeing
• 4. 脊髄髄膜瘤（二分脊椎）における整形外科的問題 orthopedic issues in myelomeningocele spina bifida
• 5. 続発性羊膜帯 amniotic band sequence

English Journal

• Is it worthwhile to routinely ultrasound screen children with idiopathic clubfoot for hip dysplasia?

• Mahan ST, Yazdy MM, Kasser JR, Werler MM.Source*Department of Orthopaedic Surgery, Boston Children's Hospital †Department of Orthopaedic Surgery, Harvard Medical School ‡Slone Epidemiology Center, Boston University, Boston, MA.
• Journal of pediatric orthopedics.J Pediatr Orthop.2013 Dec;33(8):847-51. doi: 10.1097/BPO.0000000000000100.
• PURPOSE: Patients with idiopathic clubfoot are considered at increased risk for having developmental dysplasia of the hips (DDH). However, the studies showing this association have been relatively small. Many clinicians who treat idiopathic clubfoot routinely screen the hips of these patients with u
• PMID 24172676

• Ponseti casting for club foot - above- or below-knee?: A prospective randomised clinical trial.

• Maripuri SN, Gallacher PD, Bridgens J, Kuiper JH, Kiely NT.SourceThe Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry SY10 7AG, UK.
• The bone & joint journal.Bone Joint J.2013 Nov 1;95-B(11):1570-4. doi: 10.1302/0301-620X.95B11.31899.
• We undertook a randomised clinical trial to compare treatment times and failure rates between above- and below-knee Ponseti casting groups. Eligible children with idiopathic clubfoot, treated using the Ponseti method, were randomised to either below- or above-knee plaster of Paris casting. Outcome m
• PMID 24151281

• Ilizarov in relapsed clubfoot: a necessary evil?

• Gupta P, Bither N.SourceDepartment of Orthopedics, Government Medical College & Hospital, Chandigarh, India.
• Journal of pediatric orthopedics. Part B.J Pediatr Orthop B.2013 Nov;22(6):589-94. doi: 10.1097/BPB.0b013e32836486de.
• This study aims to retrospectively evaluate the results of soft tissue distraction using Ilizarov in relapsed clubfeet following a previous posteromedial soft tissue release. This study, as compared with previous studies, has a cohort of patients with relapsed clubfeet only following posteromedial s
• PMID 24060857

Japanese Journal

• 臨床室 二度の脳出血による右内反尖足変形の1例

• 整形外科 = Orthopedic surgery 67(4), 331-333, 2016-04
• NAID 40020776071

• Development of an ankle torque measurement device for measuring ankle torque during walking

• Journal of Physical Therapy Science 27(5), 1477-1480, 2015
• NAID 130005072296

• 1A1-D02 装着型機構による内反尖足の模擬(福祉ロボティクス・メカトロニクス(1))

• ロボティクス・メカトロニクス講演会講演概要集 2014, 1A1-D02(1)-"1A1-D02(4)", 2014-05-24
• NAID 110009968621

Related Links

• Equinovarus - PO Home

Equinovarus is an odd description. Equino = "like a horse". To make sense of that you need to know that the horse hoof is a big toenail and that the horse's back pointing joint is like our heel. So walking on toe is the ...

• equinovarus - definition of equinovarus by Medical dictionary

equinovarus /equi·no·va·rus/ (-va?rus) talipes equinovarus. eq·ui·no·var·us (ĕk′wə-nō-var′əs, ĭ-kwī′nō-) n. Talipes equinovarus. equinovarus. See clubfoot. equinovarus [e-kwi″no-var´us] talipes equinovarus. equinovarus talipes ...

Related Pictures

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★リンクテーブル★

リンク元	「内反尖足」
拡張検索	「talipes equinovarus」

「内反尖足」

　　[★]

ラ

equinovarus, pes equinovarus, talipes equinovarus

関

弯足

概念

• 麻痺性足部変形で見られる。
• 脊髄性小児麻痺(ポリオ)、二分脊椎、シャルコー・マリー・トゥース病、末梢神経麻痺などの下位運動ニューロンの障害による弛緩性麻痺で麻痺性足部変形が見られる。下腿三頭筋の拘縮で尖足となり、後脛骨筋の拘縮で内反をきたす。(SOR.607)

治療

• 弛緩性麻痺には拘縮予防のために行動療法を開始し、また尖足予防のために短下肢装具や夜間装具を装着させる。(SOR.608)

国試

• 097A045

「talipes equinovarus」

　　[★]

内反尖足

関

clubfoot、equinovarus