Annals of Occupational and Environmental Medicine

Research Article

Factors related to femoral bowing among Korean female farmers: a cross-sectional study: Sangyoon Do, Chul Gab Lee, Dong Hwi Kim, GwangChul Lee, Kweon Young Kim, So Yeon Ryu, Hansoo Song; Ann Occup Environ Med 2020;32:e23. Published online July 2, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e23

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Background

Female farmers have a high prevalence of knee osteoarthritis (KOA) in South Korea. Femoral bowing has been reported to be related to KOA by increasing load on the mechanical axis. This study aimed to investigate factors related to femoral bowing in Korean female farmers.

Methods

We analyzed the legs of 264 female farmers registered with the Korea farmers' knee cohort of Jeonnam Center for Farmers' Safety and Health. A structured questionnaire was used to determine sociodemographic variables, agricultural career, cumulative squatting working time (CSWT), and cumulative heavy lifting working time. Femoral bone density was measured and Kellgren-Lawrence (KL) grades were obtained from the knee radiographs. Mechanical axis angle (MAA), femoral bowing angle (FBA), anatomical lateral distal femoral angle (aLDFA), anatomical medial proximal tibial angle (aMPTA), and condylar-plateau angle (CPA) were measured. We examined the relationship between the FBA and related factors by using multiple linear regression.

Results

The proportion of individuals with radiographic KOA (≥ KL grade 2) in this study was 37.9%. As KL grades increased, MAA, FBA, and CPA increased, whereas aLDFA and aMPTA decreased. FBA increased with age. Multiple linear regression analyses using FBA as a dependent variable showed relationship with higher age, lower height, higher BMI, lower bone mineral density, longer CSWT, and longer agricultural careers.

Conclusions

The results of this study suggest that external factors related to agricultural work in female farmers was associated with femoral bowing, in addition to internal factors such as age, bone density, height, and obesity.

Citations

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Femoral bowing in the Arab population: A cross-sectional study and literature review
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Bohyun Sim, Jaehoo Lee, Chul Gab Lee, Hansoo Song
Annals of Occupational and Environmental Medicine.2022;[Epub] CrossRef
Work-related factors of knee osteoarthritis in Korean farmers: a cross-sectional study
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Annals of Occupational and Environmental Medicine.2020;[Epub] CrossRef

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Original Article

The Association between Shift Work and Bone Mineral Density : analysis of 2008-2009 Korean National Health and Nutrition Examination Survey: Jong Ho Wang, Goeun Lee, Jun Taek Song, Jongho Kwon, Hyunrim Choi, Kyunghee Jung-Choi, Sinye Lim; Korean Journal of Occupational and Environmental Medicine 2012;24(3):274-286. Published online September 30, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.3.274

Abstract PDF

OBJECTIVES
The objectives of this study were to explore the association between shift work and the bone mineral density in a representative sample of Korean workers.
METHODS
He data from the Fourth Korean National Health and Nutrition Examination Survey (2008-2009) was used. The participants were Korean workers aged 16 to 60 years. Logistic regression analysis was applied to determine the association between shift work and the bone mineral density after controlling for covariates using the SAS version 9.3 package program.
RESULTS
The blood vitamin D level in shift workers was significantly lower than that of day workers in both males and females. In male shift workers, shift work was significantly associated with a decreased bone mineral density in the femoral neck (odds ratio(OR) 1.42, 95% confidence interval(CI)=1.05~1.92) and lumbar spine (OR 1.53, 95% CI=1.09~2.15) compared to day workers. After controlling for covariates, this association was still significant. In the case of female shift workers, shift work was significantly related to a decreased bone mineral density in the total femur (OR 2.84, 95% CI=1.69~4.79) and lumbar spine (OR 1.58, 95% CI=1.12~2.24). After controlling for covariates, this risk was not statistically significant.
CONCLUSIONS
The blood vitamin D level of shift workers was significantly lower than that of day workers. In male shift workers, shift work can decrease the bone mineral density in the femoral neck and lumbar spine. Prospective studies with information on the shift work intensity and duration and exposuredata to explain mechanisms will be needed.

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Soon Il Kwon, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Jun Ick Jung
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Annals of Occupational and Environmental Medicine.2014;[Epub] CrossRef
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Kyung Sook Kim
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