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Research Article
- Risk factors for lesions of the knee menisci among workers in South Korea’s national parks
- Donghee Shin, Kanwoo Youn, Eunja Lee, Myeongjun Lee, Hweemin Chung, Deokweon Kim
- Ann Occup Environ Med 2016;28:56. Published online October 10, 2016
- DOI: https://doi.org/10.1186/s40557-016-0143-y
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Abstract
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ePub Background This study was designed to investigate the prevalence of the menisci lesions in national park workers and work factors affecting this prevalence.
Methods The study subjects were 698 workers who worked in 20 Korean national parks in 2014. An orthopedist visited each national park and performed physical examinations. Knee MRI was performed if the McMurray test or Apley test was positive and there was a complaint of pain in knee area. An orthopedist and a radiologist respectively read these images of the menisci using a grading system based on the MRI signals. To calculate the cumulative intensity of trekking of the workers, the mean trail distance, the difficulty of the trail, the tenure at each national parks, and the number of treks per month for each worker from the start of work until the present were investigated. Chi-square tests was performed to see if there were differences in the menisci lesions grade according to the variables. The variables used in the Chi-square test were evaluated using simple logistic regression analysis to get crude odds ratios, and adjusted odds ratios and 95 % confidence intervals were calculated using multivariate logistic regression analysis after establishing three different models according to the adjusted variables.
Results According to the MRI signal grades of menisci, 29 % were grade 0, 11.3 % were grade 1, 46.0 % were grade 2, and 13.7 % were grade 3. The differences in the MRI signal grades of menisci according to age and the intensity of trekking as calculated by the three different methods were statistically significant. Multiple logistic regression analysis was performed for three models. In model 1, there was no statistically significant factor affecting the menisci lesions. In model 2, among the factors affecting the menisci lesions, the OR of a high cumulative intensity of trekking was 4.08 (95 % CI 1.00–16.61), and in model 3, the OR of a high cumulative intensity of trekking was 5.84 (95 % CI 1.09–31.26).
Conclusion The factor that most affected the menisci lesions among the workers in Korean national park was a high cumulative intensity of trekking.
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- Analysis of Knee Joint Injury Caused by Physical Training of Freshmen Students Based on 3T MRI and Automatic Cartilage Segmentation Technology: A Prospective Study
Lingling Liu, Henan Liu, Zhiming Zhen, Yalan Zheng, Xiaoyue Zhou, Esther Raithel, Jiang Du, Yan Hu, Wei Chen, Xiaofei Hu
Frontiers in Endocrinology.2022;[Epub] CrossRef
- Analysis of Knee Joint Injury Caused by Physical Training of Freshmen Students Based on 3T MRI and Automatic Cartilage Segmentation Technology: A Prospective Study
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Original Article
- The Brain Pathology on Recovery of Brain MRI after Manganese Administration in Rats
- Ji Hyeon Jung, Jung Il Kim, Se Young Kim, Min Ho Jung, Soon Sub Choi, Soo Jin Kim, Young Jin Park, Kap Yeol Jung
- Korean Journal of Occupational and Environmental Medicine 2010;22(4):371-377. Published online December 31, 2010
- DOI: https://doi.org/10.35371/kjoem.2010.22.4.371
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Abstract
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- OBJECTIVES
This study was carried out to investigate the effect on manganese on the brain of Sprague-Dawley rats, with particular focus on changes to anatomical pathology when brain MRI was recovered after manganese administration.
METHODS
There were 15 rats divided into 3 groups of 5 based on dose of manganese: control group, low dose group (10 mg/kg), and high dose group (40 mg/kg). Each dosing group received an injection of normal saline and manganese via the tail vein once a week for 4 weeks. And then, the rats were observed for 12 weeks after stopping manganese administration. Next, each rat underwent a brain MRI and then each was sacrificed. After the rats were killed, the concentrations of blood manganese were measured, and pathologic examinations of the brain were performed.
RESULTS
The signal intensity of basal ganglia on T1-weighted imaging of brain MRI did not differ between dosing groups. However, the ratio of neuron/glial cell in the basal ganglia was decreased in the low- and high-dose groups compared to the control group.
CONCLUSIONS
This study showed that the damage of neuron in basal ganglia might be permanent after signal intensity of basal ganglia on T1-weighted imaging of brain MRI was recovered.
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Original Article
- The Change of Brain MRI and Pathology According to the Administered Dose of Manganese in Rats
- Jae Myeong Lee, Jung Il Kim, Yoon Kou Kim, Min Ho Jung, Soon Sub Choi, Dae Chul Kim, Kap Yeol Jung
- Korean Journal of Occupational and Environmental Medicine 2009;21(2):184-191. Published online June 30, 2009
- DOI: https://doi.org/10.35371/kjoem.2009.21.2.184
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Abstract
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- OBJECTIVES
This study was carried out to investigate the effect of manganese on the brains of rats, and chronic exposure to manganese is known to induce Parkinsonism in human.
METHODS
The rats were divided into three groups: the first group was a control group that was administrated normal saline, and the second group was subdivided into the low dose group (10 mg/kg) and the high dose group (40 mg/kg) according to the administered dose of manganese. The rats of each group received an injection of normal saline and manganese via a tail vein once a week for 4 weeks. The rats were sacraficed at 4 weeks after the first adminstration of manganese. Brain MR imaging was performed before the rats were killed. After the rats were killed, the concentration of blood manganese was measured, and pathologic examination of the brain was performed in all the groups.
RESULTS
The concentration of blood manganese was increased proportionally to the administered dose. The signal intensity of the basal ganglia on the T1-weighted imaging of brain MRI was increased in accordance with the administered dose. The ratio of neuron/glial cells in the basal ganglia was decreased in the experiment group as compared to that of the control group.
CONCLUSIONS
This study showed that the signal intensity and the damage of neurons in basal ganglia were increased according to the administered dose of manganese in rats.
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Original Article
- Cerebrovascular, and Other Health Effects, Due to the Exposure of Ex-Workers to Carbon Disulfide in the Maunfacture of Rayon
- Joo Ja Kim, Kyung Jae Lee, Hyun Sook Hong, Dae Ho Kim
- Korean Journal of Occupational and Environmental Medicine 2003;15(1):72-83. Published online March 31, 2003
- DOI: https://doi.org/10.35371/kjoem.2003.15.1.72
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Abstract
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- OBJECTIVE: The purpose of this study was to evaluate the cerebrovascular and other related health effcets, due to the exposure of ex-workers to carbon disulfide in the manufacture of rayon.
METHODS
The study subjects comprised of 453 workers from the rayon manufacturing industry (387 males, 66 females). They were examined with a brain MRI and for other risk factors related to their occupation, such as age, work department, work duration, duration of work cessation, and blood pressure. Laboratory tests were also performed such as blood sugar, hemoglobin, cholesterol, etc. The cumulative exposure levels were calculated as the mean exposure level, per work department, multiplied by the total work duration in months.
RESULTS
75.1% of the subjects were between the ages of 40 and 59 years. 76.0% of the subjects had worked in high exposure departments (e.g., department of spinning and refining etc). 52.5% of the subjects had worked for more than 10 years, and 63.3% of the subjects had ginven up the work (exposure) more than 10 years earlier. The brain MRI findings were normal, a single lacunar infarct, multiple lacunar infarcts (mostly, on subcortex and white matter), and a hemorrhage in 52.5, 8.6, 36.2 and 2.7% respectively. Multiple lacunar infarcts were not related to the cumulative exposure level but in the female workers only, were significantly related to the increasing level of work duration (p<0.05), and in the male workers only, were related to the increased duration of work cessation and age (p<0.01). Abnormal rates of laboratory tests were higher in the multiple lacunar infarcts subjects with hypertension compared to theose with normal brain MRI findings (p<0.01).
CONCLUSIONS
The multiple lacunar infarcts of the brain seemed not to be related to the cumulative exposure level but to the low exposure departments, duration of work, duration of work cessation, age and hypertension. This was conducted as a health evaluation on workers from the rayon manufacturing industry who had terminated their exposure to carbon disulfide many years earlier.
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