To Describe the Various Attachments in Dorsal Digital Expansion (DDE) of Thumb: Laboratory Based Cross Sectional Observational Study
DOI:
https://doi.org/10.21276/99cydg11Keywords:
Abductor Pollicis Longus, Dorsal Digital Expansion (DDE), ThumbAbstract
Background: Due to the thickening & inflammation of the tendons of Abductor pollicis Longus & Extensor pollicis Brevis, a movement of thumb or compression of 1st dorsal compartment of wrist causes pain & swelling. Thus, knowledge of such variations is important for surgeons while performing plastic reconstructive surgeries. The proposed study was conducted to determine contribution of tendons of Abductor Pollicis Longus and Extensor Pollicis Brevis in formation of Dorsal Digital Expansion of thumb by dissection of proposed study area.
Methods: The present study was conducted in dissection hall, both upper limbs of minimum 66 formalin preserved cadavers of Indian individual available at Department of Anatomy have been considered for study. The tendons were traced to their insertion and anatomical variations in the EPB and various attachments on Dorsal Digital Expansion of thumb on both sides recorded. All parameters were tabulated and analyzed using chi-square test.
Results: The Abductor Pollicis Longus was attached to the DDE of right thumb in 69.69 % of cases and the 1st Palmer Interosseous was attached in 51.5 % of cases. Well defined medial margin of DDE of thumb receives contribution from 96.9 % cases from oblique head of adductor pollicis, in 7.57% cases from transverse head of adductor pollicis and lateral margin of DDE of thumb receives fibres of APB in 74.23% cases.
Conclusions: In our conclusion, multiplicity of the APL and EPB, concomitant with a variant insertion pattern, attachment of various muscular tendons to DDE of thumb is the highlight of this study. Our cases show that these additional tendons may prove to be biomechanically advantageous. Moreover, these tendons may be effectively used for reconstructive surgeries.
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