{"id":3062,"date":"2025-06-04T09:35:20","date_gmt":"2025-06-04T09:35:20","guid":{"rendered":"https:\/\/www.ijmhr.org\/IntJAnatRes\/?page_id=3062"},"modified":"2025-06-04T09:35:20","modified_gmt":"2025-06-04T09:35:20","slug":"ijar-2025-122","status":"publish","type":"page","link":"https:\/\/www.ijmhr.org\/IntJAnatRes\/ijar-2025-122","title":{"rendered":"IJAR.2025.122"},"content":{"rendered":"
<\/i> DOWNLOAD PDF<\/span><\/a><\/div><\/div><\/div>
<\/i> Table of Contents<\/span><\/a><\/div><\/div><\/div><\/div>\n

Type of Article:<\/strong> \u00a0Original Research<\/h3>\n

Volume 13; Issue 2 (June 2025)<\/strong><\/h3>\n

Page No.:<\/strong> 9197-9203<\/h3>\n

DOI:\u00a0<\/strong>https:\/\/dx.doi.org\/10.16965\/ijar.2025.122<\/h3>\n

Dorsal Digital Expansion Of Thumb \u2013 A Cadaveric Study and Its Clinical Significance<\/h3>\n

Jyothi S.R *1<\/sup>, Chaithra Rao B.R 2<\/sup>, Vasudha T.K 3<\/sup>. <\/strong><\/p>\n

*1<\/sup> Assistant Professor, Department of Anatomy, Chikkaballapur Institute of Medical Sciences, Chikkaballapura, Karnataka, India. ORCiD: <\/strong>https:\/\/orcid.org\/0009-0003-0706-893X<\/p>\n

2<\/sup> Associate Professor, Department of Anatomy, Chikkaballapur Institute of Medical Sciences, Chikkaballapura, , Karnataka, India. ORCiD: <\/strong>https:\/\/orcid.org\/0009-0004-9584-232X<\/p>\n

3 <\/sup>Professor, Department of Anatomy, Subbaiah Institute of Medical Sciences, Purale, Shivamogga, Karnataka, India. ORCiD: <\/strong>https:\/\/orcid.org\/0009-0008-7531-4035<\/p>\n

Corresponding Author:<\/strong> Dr. Jyothi S.R, Assistant Professor, Department of Anatomy, Chikkaballapur Institute of Medical Sciences, Chikkaballapura, Karnataka, India.
E-Mail:<\/strong> jyothisr39@gmail.com,9739724658<\/p>\n

ABSTRACT<\/strong><\/p>\n

Background:<\/strong> Human hand is a prehensile organ & is endowed with grasping, precision movements for skilled work. Broad representation of thumb in the brain reflects the functional importance & complexity of movements of thumb. A succession of activity occurs among the extensor tendons & the thenar muscles during opposition. Dorsal digital expansion has been reported in our study & contribution made by muscular elements which go into its formation has been described. Many authors are not in consensus regarding its anatomy, hence the study was undertaken.<\/p>\n

Methodology:<\/strong> An observational descriptive study, using 50 free upper limbs, in the department of Anatomy was carried out. Dissection was performed following instructions from the standard practical manual. Observations were described, photographed & tabulated.<\/p>\n

Results:<\/strong> The DDE (Dorsal Digital Expansion) of thumb, a pearly white translucent triangular expansion on dorsum of its proximal phalanx, is the tendinous fibers of the EPL (Extensor Pollicis Longus) & EPB (Extensor Pollicis Brevis) was found in all specimens. Medial margin being more prominent, in addition to EPL & EPB received fibers from Adductor pollicis & first palmar interossei (if present). The lateral margin received contribution from APB (Abductor Pollicis Brevis) & FPB (Flexor Pollicis Brevis). The percentage of each tendon contribution towards DDE has been tabulated & variations in the insertion of extensor tendons to the phalanges are also discussed.<\/p>\n

Conclusion:<\/strong> Human thumb plays a crucial role in the smooth functioning of hand. The knowledge of DDE adds to analyze the biomechanics of thumb & in the management of de Queverain\u2019s Tenosynovitis (DQT). Multiple tendons may attribute to disturbance in joint movements.<\/p>\n

Key words:<\/strong> Dorsal digital expansion, Extensor pollicis longus, Extensor pollicis brevis, Adductor pollicis, Abductor pollicis brevis, Flexor pollicis brevis, de Queverain\u2019s Tenosynovitis, proximal phalanx, distal phalanx.<\/p>\n

REFERENCES<\/strong><\/p>\n

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[18]. Ravi PK, Tewari J, Mishra PR, Tripathy SK, Nanda SN, Gantaguru A. Variations of extensor pollicis brevis tendon in Indian population: a cadaveric study and review literatute. J Clin Orthop Trauma 2019;10:278-281.
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\n \t Cite this article:<\/strong><\/span> Jyothi S.R, Chaithra Rao B.R, Vasudha T.K. Dorsal Digital Expansion Of Thumb \u2013 A Cadaveric Study and Its Clinical Significance. Int J Anat Res 2025;13(2):9197-9203. DOI:\u00a0<\/strong>10.16965\/ijar.2025.122\u00a0 \n <\/div>\t\n\t\t\n\n\n

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Type of Article: \u00a0Original Research Volume 13; Issue 2 (June 2025) Page No.: 9197-9203 DOI:\u00a0https:\/\/dx.doi.org\/10.16965\/ijar.2025.122 Dorsal Digital Expansion Of Thumb \u2013 A Cadaveric Study and Its Clinical Significance Jyothi S.R *1, Chaithra Rao B.R 2, Vasudha T.K 3. *1 Assistant Professor, Department of Anatomy, Chikkaballapur Institute of Medical Sciences, Chikkaballapura, Karnataka, India. ORCiD: https:\/\/orcid.org\/0009-0003-0706-893X 2
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