Clubfoot

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Clubfoot
Other namesClubfoot, congenital talipes equinovarus (CTEV)[1]
Pied bot, varus équin (bilateral).jpg
Bilateral clubfoot
SpecialtyOrthopedics, podiatry
SymptomsFoot that is rotated inwards[1]
Usual onsetDuring early pregnancy[1]
CausesUnknown[1]
Risk factorsGenetics, mother who smokes cigarettes[1]
Diagnostic methodExamination, ultrasound[1][2]
Differential diagnosisMetatarsus adductus[3]
TreatmentPonseti method (manipulation, casting, cutting the Achilles tendon, braces), French method, surgery[1][2]
PrognosisGood with treatment[2]
Frequency1 in 1,000[2]

Clubfoot is a birth defect where one or both feet are rotated inward and downward.[1][4] The affected foot and leg may be smaller than the other.[1] In about half of cases, clubfoot affects both feet.[1][5] Most of the time clubfoot is not associated with other problems.[1] Without treatment, the foot remains deformed and people walk on the sides of their feet.[2] This can result in pain and difficulty walking.[6]

The exact cause is usually unclear.[1] A few cases are associated with distal arthrogryposis or myelomeningocele.[2] If one identical twin is affected, there is a 33% chance the other one will be as well.[1] Diagnosis may occur at birth or before birth during an ultrasound exam.[1][2]

Initial treatment is most often with the Ponseti method.[1] This involves moving the foot into an improved position followed by casting, which is repeated at weekly intervals.[1] Once the inward bending is improved, the Achilles tendon is often cut, and braces are worn until the age of four.[1] Initially, the brace is worn nearly continuously and then just at night.[1] In about 20% of cases, further surgery is required.[1] Treatment can be carried out by a range of healthcare providers and can generally be achieved in the developing world with few resources.[1]

Club foot occurring in 1 to 4 of every 1,000 live births.[5][6][2] It is one of the most common birth defects affecting the legs.[2] About 80% of cases of clubfoot occur in developing countries.[5] Clubfoot is more common in firstborn children and males, who are twice as likely to be affected as females.[5][6][1] It is more common among Māori people, and less common among Chinese people.[2]

Signs and symptoms[edit]

In clubfoot, feet are rotated inward and downward.[1][4] The affected foot and leg may be smaller than the other.[1] In about half of cases, clubfoot affects both feet.[1][5][6] Most of the time clubfoot is not associated with other problems.[1]

Without treatment, the foot remains deformed and people walk on the sides or tops of their feet. This can cause calluses, foot infections, trouble fitting into shoes, pain, difficulty walking, and disability.[6][2]

Cause[edit]

There are many hypotheses about how clubfoot develops. Some hypotheses include: environmental factors, genetics, or a combination of both. Research has not yet pinpointed the root cause, but many 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."[7]

Some researchers hypothesize, from the early development stages of humans, that clubfoot is formed by a malfunction during gestation. Early amniocentesis (11–13 wks) is believed to increase the rate of clubfoot because there is an increase in potential amniotic leakage from the procedure.[citation needed] Underdevelopment of the bones and muscles of the embryonic foot may be another underlying cause. In the early 1900s, it was thought that constriction of the foot by the uterus contributed to the occurrence of 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".[7]

Genetics[edit]

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.[8] Clubfoot can also be present in people with genetic conditions such as Loeys–Dietz syndrome.

Genetic mapping and the development of models of the disease have improved understanding of developmental processes. 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 of clubfoot. PITX1 and TBX4 are uniquely expressed in the hind limb.[9]

Diagnosis[edit]

Clubfoot is diagnosed through physical examination. Typically, babies are examined from head-to-toe shortly after they are born. There are four components of the clubfoot deformity:

  1. Cavus: the foot has a high arch, or a caved appearance.
  2. Adductus: the forefoot curves inwards toward the big toe.
  3. Varus: the heel is inverted, or turned in, forcing one to walk on the outside of the foot. This is a natural motion but in clubfoot the foot is fixed in this position.
  4. Equinus: the foot is pointed downward, forcing one to walk on tiptoe. This motion occurs naturally, but in clubfoot the foot is fixed in this position. This is because the Achilles tendon is tight and pulls the foot downwards.

The acronym CAVE (cavus, adductus, varus, equinus) can be used to remember these four components of the clubfoot deformity.

Factors used to assess clubfoot severity include the stiffness of the deformity (how much it can be corrected by manually manipulating the foot), the presence of skin creases at the arch and heel, and poor muscle consistency.

Sometimes, it is possible to detect clubfoot before birth using ultrasound. Prenatal diagnosis by ultrasound can allow parents to learn more about this condition and plan ahead for treatment after their baby is born.[10]

More testing and imaging is typically not needed, unless there is concern for other associated conditions.

Treatment[edit]

Clubfeet in the course of correction

Treatment is usually with some combination of the Ponseti or French methods.[2] The Ponseti method includes the following: casting together with manipulation, cutting the Achilles tendon, and bracing. The Ponseti method has been found to be effective in correcting the problem in those under the age of two.[11] The French method, which involves realignment and taping of the foot, is often effective, but requires a lot of effort by caregivers.[2] Another technique known as Kite does not appear as good.[12] In about 20% of cases, further surgery is required.[1]

Ponseti method[edit]

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.

Using the Ponseti method, the foot deformity is corrected in stages. These stages are as follows: manipulating the foot to an improved position and then holding it with a long leg cast, then removing the cast after a week, and then manipulating the foot again. The foot position usually improves over a course of 4–6 casts. The number of casts varies from person to person to address individual needs.

  • The initial cast focuses on aligning the forefoot with the hindfoot, as Ponseti describes the forefoot as relatively pronated in comparison to the hindfoot. Supinating the forefoot and elevating the first metatarsal improves this alignment.
  • Subsequent casts are applied after stretching the foot with a focus on abducting the forefoot with lateral pressure at the talus, to bring the navicula laterally and improve the alignment of the talonavicular joint. In contrast to the Kite Method of casting, it is important to avoid constraining the calcanocuboid joint. With each additional cast, the abduction is increased and this moves the hindfoot from varus into valgus. It is important to leave the ankle in equinus until the forefoot and hindfoot are corrected.
  • The final stage of casting, is to correct the equinus. After fully abducting the forefoot with spontaneous correction of the hindfoot, an attempt is made to bring the ankle up and into dorsiflexion. For the majority of children, the equinus will not fully correct with casting and a procedure is done to facilitate this final aspect of the deformity correction. The procedure is a percutaneous Achilles tendon release or tenotomy. Ponseti advocated doing this in the clinic with a local anesthetic. For safety reasons, many centers perform this procedure with sedation or monitored anesthesia care. In this procedure, numbing medicine is applied, the skin is cleansed, and a small scalpel is used to divide the Achilles tendon. With a small scalpel there is minimal bleeding and no need for stitches. A small dressing is applied and a final clubfoot cast is applied with the foot in a fully corrected position. This cast is typically left in place for three weeks.

After correction has been achieved with casting, maintenance of correction starts with full-time (23 hours per day) use of a brace—also known as a foot abduction brace (FAB)—on both feet, regardless of whether the club foot is on one side or both, typically full-time for three months. After three months, brace wear is decreased and used mostly when sleeping for naps and at night. This part-time bracing is recommended until the child is four years of age.

Roughly 30% of children will have recurrence. A recurrence can usually be managed with repeating the casting process. Recurrence is more common when there is poor compliance with the bracing, 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 will have an imbalance between the muscles that invert the ankle (posterior tibialis and anterior tibialis muscles) and the muscles that evert the ankle (peroneal muscles). Patients with this imbalance are more prone to recurrence. After 18 months of age, this can be addressed with surgery to transfer the anterior tibialis tendon from its medial attachment (the navicula) to a more lateral position (the lateral cuneiform) to rebalance these muscle forces. While this requires a general anesthetic and subsequent casting while the tendon heals, it is a relatively minor surgery that corrects a persistent muscle imbalance while avoiding disturbance to the joints of the foot.

French method[edit]

The French method for treatment of clubfoot is a conservative method of treatment of a newborn which requires daily physical therapy for the first two months. The goal of this treatment is to avoid future need of surgery, but the success rate varies and after release surgery may still be necessary. The treatment includes daily manipulations of the feet along with stretching of the feet, followed by taping in order to maintain the range of motion gains achieved at the end of each session.

The French method differs from the Ponseti method in that the taping techniques allow some motion in the feet. Another focus is to strengthen the peroneal muscles which is thought to contribute towards long-term correction. After the two month mark physical therapy sessions can be weaned down to three times per week instead of daily until the child reaches six months. Parents are required to continue on with home exercises and night splinting even after the program has achieved proper foot correction in order to maintain the correction. The Ponseti method is generally preferred.[2]

Surgery[edit]

If non-operative treatments are unsuccessful or achieve incomplete correction of the deformity, surgery is sometimes needed. Surgery was more common prior to the widespread acceptance of the Ponseti Method. The extent of surgery depends on the severity of the deformity. Usually, surgery is done at 9 to 12 months of age and the goal is to correct all the components of the clubfoot deformity at the time of surgery.

For feet with the typical components of deformity (cavus, forefoot adductus, hindfoot varus, and ankle equinus), the typical procedure is a Posteromedial Release (PMR) surgery. This is done through an incision across the medial side of the foot and ankle, that extends posteriorly, and sometimes around to the lateral side of the foot. In this procedure, it is typically necessary to release (cut) or lengthen the plantar fascia, several tendons, and joint capsules/ligaments. Typically, the important structures are exposed and then sequentially released until the foot can be brought to an appropriate plantigrade position. Specifically, it is important to bring the ankle to neutral, the heel into neutral, the midfoot aligned with the hindfoot (navicula aligned with the talus, and the cuboid aligned with the calcaneus). Once these joints can be aligned, thin wires are usually placed across these joints to hold them in the corrected position. These wires are temporary and left out through the skin for removal after 3–4 weeks. Once the joints are aligned, tendons (typically the Achilles, posterior tibialis, and flexor halluces longus) are repaired at an appropriate length. The incision (or incisions) are closed with dissolvable sutures. The foot is then casted in the corrected position for 6–8 weeks. It is common to do a cast change with anesthesia after 3–4 weeks, so that pins can be removed and a mold can be made to fabricate a custom AFO brace. The new cast is left in place until the AFO is available. When the cast is removed, the AFO is worn to prevent the foot from returning to the old position.[10]

For feet with partial correction of deformity with non-operative treatment, surgery may be less extensive and may involve only the posterior part of the foot and ankle. This might be called a posterior release. This is done through a smaller incision and may involve releasing only the posterior capsule of the ankle and subtalar joints, along with lengthening the Achilles tendon.

Surgery leaves residual scar tissue and typically there is more stiffness and weakness than with nonsurgical treatment. As the foot grows, there is potential for asymmetric growth that can result in recurrence of foot deformity that can affect the forefoot, midfoot, or hindfoot. Many patients do fine, but some require orthotics or additional surgeries. Long-term studies of adults with post-surgical clubfeet, especially those needing multiple surgeries, show that they may not fare as well in the long term, according to Dobbs, et al.[13] Some patients 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.

Developing world[edit]

Those in LMICs are disproportionally affected. Though the Ponseti method has proven to be an effective, many children in LMICs face barriers including lack of access to resources – specifically casting materials and abduction braces. Other barriers include shortage of healthcare professionals, financial constraints of the existing institutions, training and education level of healthcare professionals and families failing to follow-up with appointments.[14] Well access has increased, coverage is not comprehensive with an estimated 15% of those diagnosed with clubfoot receiving treatment.[15] Recommendations include giving providers more knowledge of how to improve accessibility. Considerations include: early diagnosis, organizing high-volume Ponseti casting centers, using non-physician health workers, engaging families in care, addressing barriers to access, and providing follow-up in the person’s community.[16]

Epidemiology[edit]

About 80% of those affected by clubfoot are from low and middle-income countries (LMIC), approximately 100,000 children per year as of 2018.[15]

History[edit]

Pharaohs Siptah and Tutankhamun had clubfoot, and the condition appeared in Egyptian paintings.[17] Indian texts (c. 1000 BC) and Hippocrates (c. 400 BC) described treatment.[18]

Cultural references[edit]

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

References[edit]

  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z Gibbons, PJ; Gray, K (September 2013). "Update on clubfoot". Journal of Paediatrics and Child Health. 49 (9): E434–7. doi:10.1111/jpc.12167. PMID 23586398.
  2. ^ a b c d e f g h i j k l m n Dobbs, Matthew B.; Gurnett, Christina A. (18 February 2009). "Update on clubfoot: etiology and treatment". Clinical Orthopaedics and Related Research. 467 (5): 1146–1153. doi:10.1007/s11999-009-0734-9. ISSN 1528-1132. PMC 2664438. PMID 19224303.
  3. ^ Moses, Scott. "Clubfoot". www.fpnotebook.com. Archived from the original on 15 October 2017. Retrieved 15 October 2017.
  4. ^ a b "Talipes equinovarus". Genetic and Rare Diseases Information Center (GARD). 2017. Archived from the original on 15 October 2017. Retrieved 15 October 2017.
  5. ^ a b c d e Smythe, Tracey; Kuper, Hannah; Macleod, David; Foster, Allen; Lavy, Christopher (03 2017). "Birth prevalence of congenital talipes equinovarus in low- and middle-income countries: a systematic review and meta-analysis". Tropical medicine & international health: TM & IH. 22 (3): 269–285. doi:10.1111/tmi.12833. ISSN 1365-3156. PMID 28000394. Check date values in: |date= (help)
  6. ^ a b c d e O'Shea, Ryan M.; Sabatini, Coleen S. (December 2016). "What is new in idiopathic clubfoot?". Current Reviews in Musculoskeletal Medicine. 9 (4): 470–477. doi:10.1007/s12178-016-9375-2. ISSN 1935-973X. PMC 5127955. PMID 27696325.
  7. ^ a b Miedzybrodzka, Z (January 2003). "Congenital talipes equinovarus (clubfoot): a disorder of the foot but not the hand". Journal of Anatomy. 202 (1): 37–42. doi:10.1046/j.1469-7580.2003.00147.x. PMC 1571059. PMID 12587918.
  8. ^ Weymouth, KS; Blanton, SH; Bamshad, MJ; Beck, AE; Alvarez, C; Richards, S; Gurnett, CA; Dobbs, MB; Barnes, D; Mitchell, LE; Hecht, JT (September 2011). "Variants in genes that encode muscle contractile proteins influence risk for isolated clubfoot". American Journal of Medical Genetics Part A. 155A (9): 2170–9. doi:10.1002/ajmg.a.34167. PMC 3158831. PMID 21834041.
  9. ^ Dobbs, MB; Gurnett, CA (January 2012). "Genetics of clubfoot". Journal of Pediatric Orthopedics. Part B. 21 (1): 7–9. doi:10.1097/BPB.0b013e328349927c. PMC 3229717. PMID 21817922.
  10. ^ a b AskMayoExpert & et al. Can clubfoot be diagnosed in utero? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2012. "Archived copy". Archived from the original on 2014-07-08. Retrieved 2014-08-13.CS1 maint: archived copy as title (link)
  11. ^ Ganesan, B; Luximon, A; Al-Jumaily, A; Balasankar, SK; Naik, GR (2017). "Ponseti method in the management of clubfoot under 2 years of age: A systematic review". PLoS ONE. 12 (6): e0178299. Bibcode:2017PLoSO..1278299G. doi:10.1371/journal.pone.0178299. PMC 5478104. PMID 28632733.
  12. ^ Gray, K; Pacey, V; Gibbons, P; Little, D; Burns, J (Aug 12, 2014). "Interventions for congenital talipes equinovarus (clubfoot)". The Cochrane Database of Systematic Reviews. 8 (8): CD008602. doi:10.1002/14651858.CD008602.pub3. PMID 25117413.
  13. ^ Dobbs, Matthew B.; Nunley, R; Schoenecker, PL (May 2006). "Long-Term Follow-up of Patients with Clubfeet Treated with Extensive Soft-Tissue Release". The Journal of Bone and Joint Surgery. American Volume. 88 (5): 986–96. doi:10.2106/JBJS.E.00114. PMID 16651573.
  14. ^ Owen, Rosalind; Capper, Beth; Lavy, Christopher (2018). "Clubfoot treatment in 2015: a global perspective". BMJ Global Health. 3 (4).
  15. ^ a b Drew, Sarah; Gooberman-Hill, Rachael; Lavy, Christopher (2 March 2018). "What factors impact on the implementation of clubfoot treatment services in low and middle-income countries?: a narrative synthesis of existing qualitative studies". BMC Musculoskeletal Disorders. 19 (72). Retrieved 5 December 2019.
  16. ^ Harmer, Luke; Rhatigan, Joseph (2014). "Clubfoot Care in Low-Income and Middle-Income Countries: From Clinical Innovation to a Public Health Program". World Journal of Surgery. 38: 839. Retrieved 5 December 2019.
  17. ^ Matuszewski L, Gil L, Karski J (2012). "Early results of treatment for congenital clubfoot using the Ponseti method". Eur J Orthop Surg Traumatol. 22 (5): 403–406. doi:10.1007/s00590-011-0860-4. PMC 3376778. PMID 22754429.CS1 maint: multiple names: authors list (link)
  18. ^ Dobbs, Matthew B; Morcuende, José A; Gurnett, Christina A; Ponseti, Ignacio V (2000). "Treatment of Idiopathic Clubfoot". The Iowa Orthopaedic Journal. 20: 59–64. ISSN 1541-5457. PMC 1888755. PMID 10934626.

External links[edit]

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External resources