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Kim, Kim, and Kim: The Estimation of the Prevalence Rate of Boxer's Knuckle by Internet Questionnaire
Clinical Article

Korean J Sports Med 2016;35(1):10-14.

Published online: 20 January 2016

DOI: https://doi.org/10.5763/kjsm.2016.35.1.10

The Estimation of the Prevalence Rate of Boxer's Knuckle by Internet Questionnaire

Jeehyoung Kim1, Go We Kim1, , Ji Won Kim2

1Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea

2Coxdiet, Seoul, Korea

Correspondence: Go We Kim Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, 259 Wangsan-ro, Dongdaemun-gu, Seoul 02488, Korea Tel: +82-2-966-1616, Fax: +82-2-964-0743 E-mail: ggowe@naver.com

Received 31 August 2017       Revised 2 December 2017       Accepted 2 December 2017

Copyright © 2017 The Korean Society of Sports Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Boxer's knuckle has become known as rare diseases caused by trauma, congenital, idiopathic, degenerative and more. Because there is no research for specific prevalence rate, the purpose of this study is to figure out the possibility of the prevalence rate of Korean early 20's who relied on data from the Internet questionnaire about the group suspected of having Boxer's knuckle by self-diagnosis after an indirect explanation for Boxer's knuckle. The positive response rate of Boxer's knuckle analyzed by a public Internet survey questionnaire contains personal information, Boxer's knuckle symptoms, location, risk factors, family history, and so on. Total of 304 respondents include 106 males (median age, 23 years; Q1, 21–Q3, 23), 198 females (median age, 21 years; Q1, 21–Q3, 23). Thirty-three patients had severe symptoms of Boxer's knuckle (dislocation) and 42 patients had mild symptoms of Boxer's knuckle (subluxation). Sex, age, type of exercise and duration of exercise, family history, etc were analyzed. It is a result that whether or not history of severe exercise and family history are statistical significances as risk factors. Fifteen (7.7%) of 196 people who do not exercise, seven (14.0%) of 50 people with light exercise, 11 (19.0%) of 58 people with severe exercise, 28 (9.5%) of 294 people without family history and five (50.0%) of 10 people with family history showed symptoms of the Boxer's knuckle. The positive response rate of the Boxer's knuckle is 10.9%. The exercise in the possibility of injury and family history are significant predictors.

Keywords: Boxer's knuckle, Metacarpophalangeal joint, Extensor tendon dislocation

References

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Fig. 1.
Form and items of questionnaire.
kjsm-35-10f1.tif
Fig. 2.
(A) Number of Boxer's knuckle according to type of sports. (B) Percentage of Boxer's knuckle according to type of sports.
kjsm-35-10f2.tif
Fig. 3.
Number of boxer's knuckle location.
kjsm-35-10f3.tif
Fig. 4.
Plot for odds ratio of final model.
kjsm-35-10f4.tif
Table 1.
Summary of patient characteristics with Boxer's knuckle
Variable Degree
 Total (n=304) p-value
Non (n=229) Subluxation (n=42) Dislocation (n=33)
Sex         0.804
 Male 82 14 10 106  
 Female 147 28 23 198  
Age (yr)         0.854
 ≤19 22 5 2 29  
 20−25 201 35 30 266  
 ≥26 6 2 1 9  
Side         –
 Both – 23 23    
 Left – 8 7    
 Right – 9 3    
Strength of exercise         0.004
 Non 161 20 15 196  
 Soft 34 9 7 50  
 Hard 34 13 11 58  
Family history         0.000
 No 227 39 28 294  
 Yes 2 3 5 10  
Table 2.
Result of logistic regression
  Univariable analysis
 Multivariable analysis
Estimate p-value Odds ratio CI of odds ratio Estimate p-value Odds ratio CI of odds ratio
Age (yr)∗                
 20−25 0.5401 0.4762 1.72 0.48−10.97 1.0853 0.1824 2.96 0.74−20.69
 ≥26 0.5232 0.6848 1.69 0.07−20.00 0.8312 0.5469 2.30 0.09−31.98
Female vs. male 0.2325 0.5606 1.26 0.59−2.88 0.0533 0.9001 1.05 0.47−2.51
Strength of exercise                
 Non vs. hard −1.0382 0.0156 0.35 0.15−0.84 −1.2403 0.0059 0.29 0.12−0.71
 Soft vs. hard −0.3630 0.4913 0.70 0.24−1.93 −0.6779 0.2356 0.51 0.16−1.51
Family history 2.2513 0.0007 9.50 2.50−36.14 2.4646 0.0007 11.76 2.78−51.83

CI: confidence interval.

∗ Based on under 19 yr.

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