Volume 29, Issue 3 (8-2026)
J Arak Uni Med Sci 2026, 29(3): 0-0 |
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Ebrahimi B, Haeri S M J, Babazadeh-Zavieh S S, Faghih M, Masoodi Minab S, Dashti G R. Relationship between distal phalangeal base width and miniature long bone length in the hand: A morphometric study. J Arak Uni Med Sci 2026; 29 (3)
URL: http://jams.arakmu.ac.ir/article-1-8334-en.html
URL: http://jams.arakmu.ac.ir/article-1-8334-en.html
Babak Ebrahimi1 
, Seyed Mohammad Jafar Haeri2 , Seyedeh Saeideh Babazadeh-Zavieh3 , Marjan Faghih4 , Shima Masoodi Minab5 , Gholam Reza Dashti6
, Seyed Mohammad Jafar Haeri2 , Seyedeh Saeideh Babazadeh-Zavieh3 , Marjan Faghih4 , Shima Masoodi Minab5 , Gholam Reza Dashti6
1- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
2- Department of Anatomical Sciences, School of Medicine, Arak University of Medical Sciences, Arak, Iran ,haeri1982@gmail.com
3- Physical Therapy Department, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran
4- Department of Biostatistics, School of Medicine, Qom University of Medical Sciences, Qom, Iran
5- Department of Anatomical Sciences, School of Medicine, Arak University of Medical Sciences, Arak, Iran
6- Department of Anatomical Sciences, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
2- Department of Anatomical Sciences, School of Medicine, Arak University of Medical Sciences, Arak, Iran ,
3- Physical Therapy Department, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran
4- Department of Biostatistics, School of Medicine, Qom University of Medical Sciences, Qom, Iran
5- Department of Anatomical Sciences, School of Medicine, Arak University of Medical Sciences, Arak, Iran
6- Department of Anatomical Sciences, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
Abstract: (64 Views)
Introduction: The hypothesis that the thumb has three phalanges has been revealed in recent studies, indicating that it lacked a metacarpal and highlighting that metacarpal of the thumb is morphologically similar to a proximal phalanx. The previous study has shown the lack of a relationship between the longitudinal growth of the fingers and the corresponding metacarpal of the thumb. The purpose of this study was to investigate the conflicting results regarding the influence of the factor affecting finger length and finger ray length.
Materials and methods: Eighty Iranian men were enrolled in this study, without any deformity in their hands and bone pathology by investigating the anterior-posterior x-ray images of the right hands. Calculations were made for the length of all metacarpal bones (MC), proximal (PP), middle (MP), and distal phalanges (DP) of all fingers, distal phalanges width (DPW), finger lengths, and finger ray length by one observer to avoid any bias.
Results: Our study indicated significant differences between most of the ratios related to the thumb and the ratios related to the other fingers (p˂0.05). Besides, comparing the mean ratio of DPW /Finger ray length of the thumb to the DPW/Finger length ratio of other fingers, was found to show no significant differences between them (p˃0.05).
Conclusion: These results showed the similarity between the DPW/tri-phalangeal thumb length ratio and the DPW/finger length ratio of the other fingers which confirms that thumb metacarpal is the proximal phalanx. These findings may open a new research gate in thumb function and evolution.
Materials and methods: Eighty Iranian men were enrolled in this study, without any deformity in their hands and bone pathology by investigating the anterior-posterior x-ray images of the right hands. Calculations were made for the length of all metacarpal bones (MC), proximal (PP), middle (MP), and distal phalanges (DP) of all fingers, distal phalanges width (DPW), finger lengths, and finger ray length by one observer to avoid any bias.
Results: Our study indicated significant differences between most of the ratios related to the thumb and the ratios related to the other fingers (p˂0.05). Besides, comparing the mean ratio of DPW /Finger ray length of the thumb to the DPW/Finger length ratio of other fingers, was found to show no significant differences between them (p˃0.05).
Conclusion: These results showed the similarity between the DPW/tri-phalangeal thumb length ratio and the DPW/finger length ratio of the other fingers which confirms that thumb metacarpal is the proximal phalanx. These findings may open a new research gate in thumb function and evolution.
Type of Study: Original Atricle |
Subject:
Basic Sciences
Received: 2026/06/2 | Accepted: 2026/07/13
Received: 2026/06/2 | Accepted: 2026/07/13
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