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Adult Mouse Digit Amputation and Regeneration: A Simple Model to Investigate Mammalian Blastema Formation and Intramembranous Ossification

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A woman with a dangling digit.

Alexander Roesch¹, Bernd Kinner, Ulrich Schaechinger

¹Department of Dermatology, Regensburg University Medical Center, Regensburg, Germany. alexander.roesch@klinik.uni-regensburg.de

Journal Der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG

|November 3, 2007

Summary

Ainhum, a rare disorder causing toe constriction and spontaneous amputation, primarily affects dark-skinned individuals. Increased global travel means it may be seen more frequently outside its native regions.

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Area of Science:

Podiatry
Dermatology
Genetics

Background:

Ainhum, also known as dactylolysis spontanea, is a rare condition primarily affecting individuals of African descent.
It is characterized by a constricting band that develops around a toe, leading to progressive auto-amputation.
Global migration and tourism increase the likelihood of encountering Ainhum outside endemic areas.

Observation:

The condition presents with a distinct clinical and radiological picture.
A progressive constricting band encircles the toe.
Spontaneous amputation of the digit is a common outcome.

Findings:

Ainhum is specifically associated with dark-skinned populations.
The etiology remains largely unknown, but genetic factors are suspected.
Radiological findings include bone resorption and digital deformity.

Implications:

Early recognition of Ainhum is crucial for appropriate management.
Differential diagnosis should include arthritis and trauma, though Ainhum has unique features.
Prompt diagnosis and treatment can prevent complications and preserve function.