Anomalous Extensor Indicis Proprius Muscle Extending beyond the Extensor Retinaculum: A Case Report

Christine Yoon; Cyrus Hadavi; Alan Engler; Mark Erlich; Priti Mishall; Adi Pinkas

doi:10.2106/JBJS.CC.22.00681

Anomalous Extensor Indicis Proprius Muscle Extending beyond the Extensor Retinaculum: A Case Report

Christine Yoon, Cyrus Hadavi, Alan Engler, Mark Erlich, Priti Mishall, Adi Pinkas

Pathology

Research output: Contribution to journal › Article › peer-review

Abstract

Case:During dissection of the upper limb of a cadaver in preparation for a first-year anatomy course, an extensor indicis proprius (EIP) variant was discovered with its muscle belly extending distal to the extensor retinaculum and beyond what has been previously described in the literature.Conclusion:EIP is commonly used as a tendon transfer for extensor pollicis longus rupture. Few anatomic variants of EIP have been reported in the literature, but such variants should be considered because of their consequences to the success of tendon transfer and potential implications for diagnosis of an otherwise unexplained mass of the wrist.

Original language	English (US)
Article number	e22.00681
Journal	JBJS Case Connector
Volume	13
Issue number	1
DOIs	https://doi.org/10.2106/JBJS.CC.22.00681
State	Published - Feb 22 2023

Keywords

CTS
EDC
EIP
EIP-EPL tendon transfer
EPL
EPL rupture
carpal tunnel syndrome
distal radius fracture
dorsal wrist pain
elderly
extensor digitorum communis
extensor indicis propius
extensor pollicis longus
extensor pollicis longus rupture
ganglion cyst
median nerve compression
opponensplasty
palmaris longus
pediatric
rheumatoid arthritis
tendon transfer
tenosynovitis
wrist sprain

ASJC Scopus subject areas

Surgery
Orthopedics and Sports Medicine

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10.2106/JBJS.CC.22.00681

Cite this

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title = "Anomalous Extensor Indicis Proprius Muscle Extending beyond the Extensor Retinaculum: A Case Report",

abstract = "Case:During dissection of the upper limb of a cadaver in preparation for a first-year anatomy course, an extensor indicis proprius (EIP) variant was discovered with its muscle belly extending distal to the extensor retinaculum and beyond what has been previously described in the literature.Conclusion:EIP is commonly used as a tendon transfer for extensor pollicis longus rupture. Few anatomic variants of EIP have been reported in the literature, but such variants should be considered because of their consequences to the success of tendon transfer and potential implications for diagnosis of an otherwise unexplained mass of the wrist.",

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author = "Christine Yoon and Cyrus Hadavi and Alan Engler and Mark Erlich and Priti Mishall and Adi Pinkas",

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doi = "10.2106/JBJS.CC.22.00681",

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AU - Yoon, Christine

AU - Hadavi, Cyrus

AU - Engler, Alan

AU - Erlich, Mark

AU - Mishall, Priti

AU - Pinkas, Adi

PY - 2023/2/22

Y1 - 2023/2/22

N2 - Case:During dissection of the upper limb of a cadaver in preparation for a first-year anatomy course, an extensor indicis proprius (EIP) variant was discovered with its muscle belly extending distal to the extensor retinaculum and beyond what has been previously described in the literature.Conclusion:EIP is commonly used as a tendon transfer for extensor pollicis longus rupture. Few anatomic variants of EIP have been reported in the literature, but such variants should be considered because of their consequences to the success of tendon transfer and potential implications for diagnosis of an otherwise unexplained mass of the wrist.

AB - Case:During dissection of the upper limb of a cadaver in preparation for a first-year anatomy course, an extensor indicis proprius (EIP) variant was discovered with its muscle belly extending distal to the extensor retinaculum and beyond what has been previously described in the literature.Conclusion:EIP is commonly used as a tendon transfer for extensor pollicis longus rupture. Few anatomic variants of EIP have been reported in the literature, but such variants should be considered because of their consequences to the success of tendon transfer and potential implications for diagnosis of an otherwise unexplained mass of the wrist.

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KW - EDC

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KW - EPL

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KW - carpal tunnel syndrome

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KW - extensor indicis propius

KW - extensor pollicis longus

KW - extensor pollicis longus rupture

KW - ganglion cyst

KW - median nerve compression

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KW - pediatric

KW - rheumatoid arthritis

KW - tendon transfer

KW - tenosynovitis

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Anomalous Extensor Indicis Proprius Muscle Extending beyond the Extensor Retinaculum: A Case Report

Abstract

Keywords

ASJC Scopus subject areas

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