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 Table of Contents    
CASE REPORT  
Year : 2015  |  Volume : 49  |  Issue : 4  |  Page : 478-481
Nine toes; Mirror Foot Deformity


1 Department of Plastic and Reconstructive Surgery and Burns, Institute for Mother and Child Health Care of Republic Serbia, 11070 Novi Beograd, Senegal
2 Department of Orthopedics and Traumatology, Institute for Mother and Child Health Care of Republic Serbia, 11070 Novi Beograd, Senegal
3 Department of Physical Therapy and Rehabilitation, Institute for Mother and Child Health Care of Republic Serbia, 11070 Novi Beograd, Senegal

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Date of Web Publication1-Jul-2015
 

   Abstract 

Mirror foot is a very rare congenital anomaly, with only a few papers presenting definitive treatment for this entity. There are limited management recommendations. Most cases are treated before walking age. In our case, there were no associated developmental defects of the leg. The child underwent complex rays resection with medial foot reconstruction. After 7.5 years of followup, definitive surgical treatment was performed with satisfactory cosmetic and functional outcome.

Keywords: Diplopodia, mirror foot, polydactyly
MeSH terms: Congenital abnormalities, supernumerary organs, foot bones, foot

How to cite this article:
Vlahovic AM, Pistignjat BS, Vlahovic NS. Nine toes; Mirror Foot Deformity. Indian J Orthop 2015;49:478-81

How to cite this URL:
Vlahovic AM, Pistignjat BS, Vlahovic NS. Nine toes; Mirror Foot Deformity. Indian J Orthop [serial online] 2015 [cited 2019 Nov 22];49:478-81. Available from: http://www.ijoonline.com/text.asp?2015/49/4/478/159681

   Introduction Top


Polydactyly is a relatively common anomaly of the foot. [1] It is characterized by the presence of supernumerary digits involving the hands, feet or both. [1],[2] The overall incidence of polydactyly is 1.7/1000 births with significantly higher incidence among African-American population. [1],[3] Polydactyly occurs as an isolated deformity or as a part of an established genetic syndrome. [1],[3],[4],[5] Temtamy and McKusick described polydactyly based on the location of the extra digits: Preaxial (medial ray), central and postaxial (lateral ray). [2],[3],[6] There is no strict definition of foot polydactyly and the condition is often compared with hand anomalies. [5] There are several classification systems for foot polydactyly, based upon metatarsal morphology, ray involvement and levels of duplication. [1],[2] Preaxial mirror polydactyly of the foot, also called mirror foot, is a distinctly rare anomaly with less than 30 cases reported in literature to date and with even less documentation of definitive treatment. [5],[7] Although some authors consider mirror foot as any foot with mirror image polydactyly, others believe that mirror duplication of all the skeletal elements of the foot on the tibial aspect must be present to fulfill the criteria for diagnosing a mirror foot. [7],[8] The primary treatment for preaxial mirror polydactyly is surgical and is more complex compared to postaxial polydactyly. [2] There are limited management recommendations in literature for this anomaly and various complications such as hallux varus, splaying of the first ray and short first metatarsal, should be anticipated when planning the reconstruction. [3],[6],[7]


   Case Report Top


A 14 month old female patient was referred to our out-patient clinic with a congenital malformation of the right foot. Both pregnancy and delivery was unremarkable. There was no family history of congenital malformations. Clinical examination showed that the trunk, upper limbs and the left lower limb were normal. There was no limb-length discrepancy. Normal range of motion of the knee, subtalar and ankle joints on the right lower limb was noted. Motion of the metatarsophalangeal (MTP) joints appeared normal. There were obvious supernumerary digits on the medial aspect of the right foot. Between the hallux and four normal toes, there were four duplicated toes with syndactyly between the first and the second. The lateral four digits appeared normal [Figure 1]a. Radiographs of the lower extremities revealed normal findings other than the right foot. On radiographs of the foot, there were eight fully developed digits with metatarsal bones, small rudimentary digit without metatarsal bone and with first metatarsal being hypoplastic [Figure 1]b. Based on the clinical and radiographic findings, a diagnosis of mirror foot was made. Corrective surgical procedure was performed under general anesthesia and tourniquet control. A wedge resection of the four duplicated rays was performed followed by complete release of the first MTP joint. Release of the tight abductor hallucis tendon was performed. The first ray was brought laterally to close the wedge and was held in place with a Kirschner wire [Figure 1]c. The postoperative course was uneventful. A long leg cast was applied. After extraction of Kirschner wire, we lost contact with patient for 7.5 years. The patient reviewed back at the age of 9 years with her mother. She had difficulties walking and shoe wearing. A cutaneous scar was noted over the medial aspect of the right foot as a result of the previous surgical intervention. The right foot was wide; with abduction of the first MTP joint [Figure 2]a. Radiographs revealed a wide space between the first and second rays. Angulation of first MTP joint (near 130°), with a supernumerary tarsal bone was noticed between the medial and intermediate cuneiform bones [Figure 2]b. All metatarsals were in adducted position. During the second surgical procedure excision of supernumerary tarsal bone was performed. Reposition of the first metatarsal bone was performed and held in place with a 2 mm Kirschner wire. Correction of hallux varus was held in place with 1, 8 mm Kirschner wire. Reinsertion of the tight abductor halluces tendon was performed. A long leg cast was applied for two weeks. After this period the sutures were removed and short leg cast was applied for following four weeks. After six weeks full weight bearing was allowed. The final result was satisfactory functionally and aesthetically [Figure 2]c.
Figure 1: (a) Clinical photograph showing mirror foot appearance of the right foot at the time of first admission (b) Anteroposterior x-ray of the right foot showing eight metatarsal and nine toes (c) Postoperative clinical photograph showing resection of four rays

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Figure 2: (a) Clinical appearance of the foot after 7½ year (b) Anteroposterior x-ray of the foot showing wide space between 1st and 2nd ray, supernumerary tarsal bone and hallux varus (c) clinical photograph of the foot showing appearance after the second surgical procedure

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   Discussion Top


The formation of the limbs is regulated by a complex series of molecular signals. [1],[9] Three signaling centers that control limb development have been discovered: The apical ectodermal ridge (AER), the "zone of polarizing activity" and the wingless-type (Wnt) signaling center. [9] The limb buds form deep to a thick band of ectoderm. At the apex of each limb bud, the ectoderm thickens to form an AER. The AER exerts an influence on the limb mesenchyme that initiates growth and development of the limbs in a proximo-distal axis. Mesenchymal cells aggregate at the posterior margin of the limb bud to form the "zone of polarizing activity" which regulates limb growth and development on an antero-posterior axis. [6],[9] Wnt signaling center secretes factors that induce the underlying mesoderm to adopt the dorsal characteristics. [9] During the 7 th week, condensations of mesenchyme form digital rays and toes in the footplates. [1]

The exact etiology of polydactyly is not fully understood. [3] It can occur as an isolated deformity with different forms of polydactyly representing distinct genetic entities or in association with other congenital anomalies such as hand polydactyly and/or syndactyly, anorectal anomalies, tibial deficiencies, cleft of the lip and palate, cardiac defects. [1],[2] Polydactyly have been associated with several syndromes: Pallister-Hall, Lawrence-Moon-Bardet-Biedl, Ellis Van Creveld, Rubinstein-Taybi, facio digital, cephalo-polysyndactyly, Holt-Oram and Down syndrome. [1],[7] Polydactyly of the foot is a relatively common anomaly. [3] Several classifications of foot polydactyly are available in the literature. Temtamy and McKusick based their classification on the location of extra digits and the syndrome involved. [2] Venn Watson introduced a morphologic classification based upon the anatomic configuration of the metatarsals and duplicated bony parts. [10] Fukazawa et al. made an analogy with the mirror hand classification. [5] Watanabe et al. classified polydactyly into medial, central and lateral ray groups, further subdivided into tarsal, metatarsal, proximal phalangeal and distal phalangeal groups. [1] This classification was found most useful by several authors. [1],[4],[11]

Mirror foot represents extreme form of foot polydactyly. Some authors stated that mirror foot and diplopodia are descriptive terms for the same condition. [8],[12] Diplopodia simply suggests that the foot is duplicated and the supernumerary toes do not have to be in the mirror duplication. [8] Khan et al. stated that diplopodia has to be differentiated from polydacyly, where accessory tarsal or metatarsal bones are not seen. [13] Etiology of mirror foot is connected to aberrant positioning of the "zone of polarizing activity". [6] The true definition of mirror foot is author dependent and classification of this anomaly is based on sporadic cases. [2],[5] Sudesh et al. stated that mirror foot should be differentiated from polydactyly by presence of accessory tarsal bones. [7] Watanabe et al. have added mirror duplication of the foot to the spectrum of preaxial polydactyly. [1],[11] Belthur et al. suggested that the mirror foot represents an extreme form of preaxial polydactyly and they have added this deformity as additional type of preaxial polydactyly. [1] Verghese et al. proposed the term "preaxial mirror polydactyly" which includes feet with supernumerary rays situated medial to the first ray (preaxially) with characteristics of postaxial toes. They have not included tarsal duplication because of its variability. [8] Preaxial mirror polydactyly (mirror foot) is an extremely rare condition. It can be associated with tibial and fibular abnormalities, with anomalies of hindfoot, midfoot and forefoot, variably expressed. [1],[2],[8] Fukazawa et al. in their study have reported that until 2009 only 28 cases of mirror feet have been reported in English literature with only seven cases documented for their treatment. [5],[6],[7],[8] Our patient has been treated 10 years ago and at that time there were even fewer reports on mirror foot. Treatment of this anomaly is complex because it has both functional and a esthetic implications. [6],[7] McCarthy et al. and Galois et al. stated that the surgical treatment of preaxial polydactyly is complex with poor long term result. [3],[4] Most cases are treated during childhood, before or after walking age with individualized approach for every patient. [3],[5] At the time of the first treatment our patient was 14-month-old. Some authors have advocated that the surgery should be delayed until ossification and hence the accurate anatomic assessment is possible. [14] Our patient had mirror foot with eight metatarsals and nine toes. 10 toes are the highest number reported in literature. [5] Karchinov stated that excision of supernumerary tarsal bones is very important for successful treatment of these anomalies. [15] In our case during first surgical treatment supernumerary tarsal bone was not excised. After 7.5 years gap, it was obvious that excision of supernumerary rays without excision of supernumerary tarsal bone was not sufficient. Clinical and aesthetical outcome after the second surgical treatment and excision of the supernumerary tarsal bone was significantly better.

To conclude, a case of nine toes mirror foot is presented. At first operation a supernumerary tarsal bone was not excised. After a 7.5 year gap in followup the patient was presented with varus deformity of the first ray. After excision of the supernumerary tarsal bone and realignment of the first ray the result was significantly better. The rarity of the condition and the scarcity of literature regarding its management contributed to failure of the first operation and this report might therefore help others avoid a similar outcome.

 
   References Top

1.
Belthur MV, Linton JL, Barnes DA. The spectrum of preaxial polydactyly of the foot. J Pediatr Orthop 2011;31:435-47.  Back to cited text no. 1
    
2.
Christensen JC, Leff FB, Lepow GM, Schwartz RI, Colon PA, Arminio ST, et al. Congenital polydactyly and polymetatarsalia: Classification, genetics, and surgical correction. 1981. J Foot Ankle Surg 2011;50:336-9.  Back to cited text no. 2
[PUBMED]    
3.
McCarthy GJ, Lindaman L, Stefan M. Pedal polydactyly: An overview with case report. J Foot Ankle Surg 1995;34:577-82.  Back to cited text no. 3
    
4.
Galois L, Mainard D, Delagoutte JP. Polydactyly of the foot. Literature review and case presentations. Acta Orthop Belg 2002;68:376-80.  Back to cited text no. 4
    
5.
Fukazawa H, Kawabata H, Matsui Y. Mirror foot: Treatment of three cases and review of the literature. J Child Orthop 2009;3:277-82.  Back to cited text no. 5
    
6.
Mishra A, Nelson K, McArthur P. Mirror foot : A reflection on three cases. J Plast Reconstr Aesthet Surg 2010;63:2146-51.  Back to cited text no. 6
    
7.
Sudesh P, Kumar V, Jain M, Patel S. Mirror foot and our surgical experience: A case report and literature review. Foot (Edinb) 2010;20:44-5.  Back to cited text no. 7
    
8.
Verghese R, Shah H, Rebello G, Joseph B. Preaxial mirror polydactyly associated with tibial deficiency: A study of the patterns of skeletal anomalies of the foot and leg. J Child Orthop 2007;1:49-54.  Back to cited text no. 8
    
9.
Kozin SH. Upper-extremity congenital anomalies. J Bone Joint Surg Am 2003;85-A:1564-76.  Back to cited text no. 9
    
10.
Venn-Watson EA. Problems in polydactyly of the foot. Orthop Clin North Am 1976;7:909-27.  Back to cited text no. 10
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11.
Watanabe H, Fujita S, Oka H. Polydactyly of the foot: An analysys of 265 cases and a morphological classification. Plast Reconstr Surg 1992;89:856-77.  Back to cited text no. 11
    
12.
Kadir KH, Abdul Rashid AH, Das S, Ibrahim S. A rare case of diplopodia and syndactyly: Anatomical and surgical considerations. J Foot Ankle Surg 2011;50:252-6.  Back to cited text no. 12
    
13.
Khan SA, Kumar A, Varhney MK. A rare association of deformities with diplopodia, aplasia of the tibia and double fibula: A case report. J Med Case Rep 2008;2:102.  Back to cited text no. 13
    
14.
El-Shazly M. An eight-toed foot: A rare pedal polydactyly. J Foot Ankle Surg 2007;46:207-9.  Back to cited text no. 14
    
15.
Karchinov K. Congenital diplopodia with hypoplasia or aplasia of the tibia. A report of six cases. J Bone Joint Surg Br 1973;55:604-11.  Back to cited text no. 15
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Correspondence Address:
Aleksandar M Vlahovic
Borivoja Stevanovica 10 v, Belgrade
Senegal
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0019-5413.159681

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