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Triphalangeal thumb

Last revised by Leonardo Lustosa ◉ on 6 Oct 2024

Citation, DOI, disclosures and article data

Citation:

Al Salam H, Lustosa L, Ranchod A, et al. Triphalangeal thumb. Reference article, Radiopaedia.org (Accessed on 22 Mar 2025) https://doi.org/10.53347/rID-10617

DOI:

https://doi.org/10.53347/rID-10617

Permalink:

https://radiopaedia.org/articles/10617?embed_domain=hackmd.io%2F%40yIPUAFeCSL2JsU8smR5nJQ%2Fbnjhjgjghjghjghfavicon.icofavicon.icofavicon.icofavicon.ico

rID:

10617

Article created:

25 Aug 2010, Hani M. Al Salam

Disclosures:

At the time the article was created Hani M. Al Salam had no recorded disclosures.

View Hani M. Al Salam's current disclosures

Last revised:

6 Oct 2024, Leonardo Lustosa ◉

Disclosures:

At the time the article was last revised Leonardo Lustosa had no financial relationships to ineligible companies to disclose.

View Leonardo Lustosa's current disclosures

Revisions:

10 times, by 8 contributors - see full revision history and disclosures

Systems:

Musculoskeletal, Paediatrics

Tags:

thumb, congenital anomaly, cases

Synonyms:

Tri-phalangeal thumb
Tri-phalangeal thumbs
Triphalangeal thumbs

Triphalangeal thumb is considered a form of preaxial polydactyly.

Epidemiology

Triphalangeal thumbs have an incidence of 1 in 25,000 ⁷.

Associations

There is a long list of associations ^1-6:

Aase syndrome
anatomic variant: isolated anomaly
Diamond-Blackfan syndrome
DOOR syndrome
Duane-radial syndrome
Fanconi anemia (pancytopenia-dysmelia syndrome)
fetal hydantoin syndrome (Dilantin embryopathy)
Goodman syndrome
Holt-Oram syndrome
hypomelanosis of Ito
IVIC syndrome
Juberg-Hayward syndrome
Lacrimo-auriculo-dento-digital syndrome (LADD syndrome / Levy-Hollister syndrome)
mesomelic dysplasia (Werner type)
Nager syndrome
Poland syndrome (pectoral muscle aplasia-syndactyly)
thalidomide embryopathy
Townes-Brocks syndrome
trichorhinophalangeal dysplasia type II (Langer Giedion syndrome)
trisomy 13
trisomy 22
VATER association

Pathology

A triphalangeal thumb, as the name implies, has three phalanges instead of the usual two. There is an autosomal dominant genetic transmission ^8,9.

References

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Triphalangeal thumb