Document Detail

Tactile sensibility on the fingernail.
MedLine Citation:
PMID:  24206979     Owner:  NLM     Status:  In-Data-Review    
PURPOSE: To measure tactile discrimination (static and moving 2-point discrimination) and threshold levels (Weinstein enhanced sensory test) over the nail plate in normal subjects and compare these values with those at the corresponding finger pulps.
METHODS: Tactile discrimination and threshold values over the nail plates and finger pulps were measured on 300 digits in 30 healthy subjects with a mean age of 23 years. Subjects with cosmetic nail modifications, injuries, neurological deficits, dermatological conditions, or history of upper limb surgery were excluded. Equivalence testing was conducted to look for clinical equivalence between values obtained at both sites.
RESULTS: The mean static 2-point discrimination, moving 2-point discrimination, and threshold value over the human nail were 6.7 mm, 2.4 mm, and 0.06 g, respectively. The corresponding values for the finger pulp were 2.4 mm, 2.2 mm, and 0.01 g, respectively. The static 2-point discrimination and threshold values were superior for the finger pulp, whereas moving 2-point discrimination values at both sites were clinically equivalent.
CONCLUSIONS: Our study suggests that tactile discrimination and threshold levels can be measured over the nail plate and that moving 2-point discrimination values are clinically equivalent to those obtained on the corresponding pulp. This highlights the importance of the nail plate in the sensory function of the fingertip. The normative data from this study may be useful in establishing the impact of nail injury and the contribution of the nail to the overall function of the hand.
Benjamin Zhi Qiang Seah; Clement Chun Ho Wu; Sandeep Jacob Sebastin; Amitabha Lahiri
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of hand surgery     Volume:  38     ISSN:  1531-6564     ISO Abbreviation:  J Hand Surg Am     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7609631     Medline TA:  J Hand Surg Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2159-63     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.
Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Hand and Reconstructive Microsurgery, National University Hospital, Singapore.
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