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In Japan, especially in the past, people tended to wear wooden sandals or the like, which separated their halluces from their index toes.

geta

As a result, there is often a gap between their halluces and index toes.

anime feet with a noticeable gap between the first and second toes

What's the terminology for this kind of deformity? I searched a potential terminology, Bunion or hallux valgus, but all pictures I got were the ones where there was no gap between the hallux and the index toe. Besides, it's said that 'proposed factors include wearing overly tight shoes, high-heeled shoes, family history, and rheumatoid arthritis', where geta is not mentioned at all.

I searched hallux varus, the pictures and the description I got is nearer to what I expected, yet when I search 'hallux varus' + 'japan' or 'japanese', the results I got were all about hallux valgus. To add yet another twist, in the abstract of The etiology of hallux valgus in Japan, the author even says:

Until recent years, hallux valgus did not exist in Japan.

I'm confused. What's the correct terminology?

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    $\begingroup$ @JiminyCricket. This article says the gap is a healthy deformity, not a pathological one. $\endgroup$
    – Michael
    Aug 17, 2022 at 13:29
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    $\begingroup$ Yeah. I deleted my comment because I'm unsure of my ground in arguing that or any position. I have feet a bit like that anyhow, so you can put it down to personal bias. You might still have more luck on medical I suspect. $\endgroup$ Aug 17, 2022 at 13:34
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    $\begingroup$ Fwiw, my toes are separated like that and I have never worn that style of shoe in my life. The article you link is not loading for me... $\endgroup$
    – Bryan Krause
    Aug 17, 2022 at 13:46
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    $\begingroup$ @BryanKrause It can load easily for me. Its name is 'A comparative study of foot morphology between Filipino and Japanese women, with reference to the significance of a deformity like hallux valgus as a normal variation'. $\endgroup$
    – Michael
    Aug 17, 2022 at 13:53
  • $\begingroup$ there is some evidence this is actually the normal condition or at least far more common, and people without it have a deformity caused by wearing closed shoes. It is very common in hominid and fossil human footprints. $\endgroup$
    – John
    Dec 8, 2022 at 22:41

1 Answer 1

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This is sometimes called a "sandal gap." See here.

Gap between the 1st and 2nd toes (sandal gap).

enter image description here

The above NIH link lists 58 known conditions with this feature+.

...

Other sources emphasize "halux varus" as a common cause for a larger interphalangeal gap between the first two toes. (Though, note, such a gap is unlikely to appear as in the OP's photo, which is lacking characteristic "bent" toes commonly seen in such deformations of the big toe and surrounding anatomy).

Hallux varus is a deformity of the great toe that is characterized by adduction of the hallux and medial subluxation of the first MTP joint. [Source]1

  • See linked source for photos. See here2 for more technical information.

Interesting, radiopaedia suggests that these two terms (sandal gap and hallux varus) are linked.

A sandal gap deformity, also known as hallux varus, is an imaging observation in antenatal ultrasound (typically second trimester) where there is an expanded first interspace, i.e. the gap between the great toe of the foot from the rest of the toes (likened to the gap caused by a sandal).

I think the intent to synonymize these terms is inappropriate based on the other more detailed and peer-reviewed sources I linked/cited. However, I also include this quote due to their usage of the phrase "expanded first interspace" to describe this gap -- However, I cannot find much reputable relevant usage of this phrase in a quick Google or Google Scholar search, so I don't think it's the broad-usage term the OP is looking for.

Other conditions to rule out

FYI: Plantar plate disruption (or injury) is related but not what you're looking for. It's a v-like gap due to injury vs a genetic anatomical characteristic that you're describing.

enter image description here

Also, according to an article in the The Journal of Rheumatology3, "A gap between toes can be an indication of rheumatoid nodulosis, a relatively benign variant of rheumatic disease."

  • However, this condition appears between any toe due to rheumatic disease during life, and images from the linked paper rule it out as the more general genetic morphological condition the OP is asking about.

Citations:

1. Vanore, J.V., Christensen, J.C., Kravitz, S.R., Schuberth, J.M., Thomas, J.L., Weil, L.S., Zlotoff, H.J. and Couture, S.D., 2003. Diagnosis and treatment of first metatarsophalangeal joint disorders. Section 3: Hallux varus. The journal of foot and ankle surgery, 42(3), pp.137-142.

2. Boike, A.M. and Christein, G., 1994. Hallux varus. Hallux Valgus and Forefoot Surgery, pp.307-312.

3. Prati, C., Brion, B.B., Leclerc, G. and Wendling, D., 2014. Spacing of Toes Reveals Rheumatoid Nodulosis. The Journal of Rheumatology, 41(5), pp.973-974.


+ below is an unformatted quick list of the 58 conditions (listed alphabetically) copied in case the cited link dies. One could certainly explore the literature for each of these conditions to determine if some other common phrase/term is additionally used to describe this gap across these conditions.

Acromesomelic dysplasia 4; Acrootoocular syndrome; Al-Raqad syndrome; ALG12-congenital disorder of glycosylation; Arthrogryposis, distal, type 2B2; Arthrogryposis, distal, with impaired proprioception and touch; Atelosteogenesis type II; Atelosteogenesis type III; Autosomal dominant intellectual disability-craniofacial anomalies-cardiac defects syndrome; Cardiac malformation, cleft lip/palate, microcephaly, and digital anomalies; Chromosome 6q24-q25 deletion syndrome; Clark-Baraitser syndrome; Cleft palate-stapes fixation-oligodontia syndrome; CLOVES syndrome; Coffin-Siris syndrome 1; Coffin-Siris syndrome 5; Congenital disorder of glycosylation, type iit; Coxopodopatellar syndrome; Cranioectodermal dysplasia 3; Cutis laxa with severe pulmonary, gastrointestinal and urinary anomalies; Desbuquois dysplasia 1; Developmental delay with autism spectrum disorder and gait instability; Duane-radial ray syndrome; Ectodermal dysplasia with facial dysmorphism and acral, ocular, and brain anomalies; Endocrine-cerebro-osteodysplasia syndrome; Growth delay due to insulin-like growth factor I resistance; Hydrocephalus-costovertebral dysplasia-Sprengel anomaly syndrome; Intellectual developmental disorder with dysmorphic facies and behavioral abnormalities; Intellectual disability, autosomal dominant 1; Intellectual disability-facial dysmorphism syndrome due to SETD5 haploinsufficiency; Kohlschutter-Tonz syndrome-like; Larsen-like syndrome, B3GAT3 type; Lethal acantholytic epidermolysis bullosa; Lethal hemolytic anemia-genital anomalies syndrome; Linear skin defects with multiple congenital anomalies 2; Mandibuloacral dysplasia progeroid syndrome; Meier-Gorlin syndrome 6; Menke-Hennekam syndrome 1; Menke-Hennekam syndrome 2; Microcephalus cardiomyopathy syndrome; Micrognathia-recurrent infections-behavioral abnormalities-mild intellectual disability syndrome; Microphthalmia with limb anomalies; Myofibrillar myopathy 10; Neurodevelopmental disorder with dysmorphic facies and distal limb anomalies; Neurodevelopmental, jaw, eye, and digital syndrome; Nicolaides-Baraitser syndrome; Oculofaciocardiodental syndrome; Orofaciodigital syndrome 18; Orofaciodigital syndrome V; Oto-palato-digital syndrome, type I; Seckel syndrome 1; Short stature, facial dysmorphism, and skeletal anomalies with or without cardiac anomalies 1; Short stature-optic atrophy-Pelger-HuC+t anomaly syndrome; Short-rib thoracic dysplasia 16 with or without polydactyly; Specific granule deficiency 2; Toes, space between first and second; X-linked intellectual disability Cabezas type; Zechi-Ceide syndrome;

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    $\begingroup$ Note: I'm not an expert in this. I'm a biology professor who teaches human A&P and has the internet (e.g., Google Scholar) available to me. So take my answer as a summary of 10 minutes of compiling relevant knowledge/info. There may be a better/broader answer. (In fact, I feel like I've come across something in the past -- I'll take a look at some of my A&P textbooks when I return to my office). $\endgroup$ Aug 17, 2022 at 22:28
  • $\begingroup$ So, how about your 'look' when you return to your office? $\endgroup$
    – Michael
    Aug 23, 2022 at 10:25
  • $\begingroup$ @Michael turned out none of them mentioned this explicitly. So, I'll leave my answer as is. $\endgroup$ Aug 23, 2022 at 14:10

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