出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/07/31 01:10:27」(JST)
| 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 |
| Patient UK | Club foot |
| MeSH | D003025 |
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[edit on Wikidata]
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Club foot or clubfoot, is a term for the medical condition congenital talipes equinovarus (CTEV). It is a congenital deformity involving one foot or both.[1] 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.[2]
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."[3]
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.[citation needed] 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.[citation needed]
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".[3] 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.[4] Clubfoot can also be present in patients with genetic conditions such as Loeys-Dietz syndrome.
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.[5] Further studies duplicating this pathway in models need to be conducted to hopefully find what genetic abnormalities cause clubfoot.
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.[6]
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.[7]
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.
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. This method is not widely used[citation needed], only in France, Texas Scottish Rite and a handful of other places. In the latest research publications issued in France, it is indicated that the French Functional method is more successful than the Ponseti method and that they will use this method countrywide.[8]
Extensive surgery of the soft tissue or bone is not usually necessary to treat clubfoot; however, a minimal procedure may be required:
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.[citation needed]
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.[6]
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.[11] 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[12] 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. These treatments tend to be less effective in patients with Loeys-Dietz syndrome because of the underlying connective tissue disorder.
The common consensus among medical professionals regarding long-term outlook of club foot surgery is a full recovery and "normal" lifestyle.[medical citation needed] However, cases with no adverse impact long term are rare.
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.[13]
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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.[6]
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. Many will require orthopedic shoes as adults, some will require a leg brace despite previous surgery.
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.,[14] 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.
Treatment of clubfoot is evident as early as Egyptian paintings. In early days,[when?] the foot was manipulated with a Thomas wrench and casting which caused fracture of several bones in the foot.
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, Mia Hamm 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,[16] 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,[citation needed] and Freddy Sanchez, one of its infielders, cites his ability to overcome the defect as a reason for his success.[17] 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.[18] 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.[19]
Propaganda Minister Joseph Goebbels was born with the congenital deformity of a club foot, as his biography written by Peter Longerich says at page 5. The surgical operation did not improve his conditions, so he was forced to limp all life. His right leg was in fact shorter than the other, and he was not admitted in the ranks of the German Army during the First World War.
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.[20]
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.[21]
Musculoskeletal disorders: Acquired musculoskeletal deformities (M20–M25, M95, 734–738)
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Congenital malformations and deformations of musculoskeletal system / musculoskeletal abnormality (Q65–Q76, 754–756.3)
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| Appendicular limb / dysmelia |
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| リンク元 | 「内反足」「talipes varus」 |
| 関連記事 | 「foot」「club」 |