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Korean Journal of Preventive Medicine 1997;30(4): 805-814.
A Case Report on the Meniscal Tear due to Repetitive Foot-Switch Stepping.
Sun Hee Yu, Hyun Sul Lim, Doo Hie Kim, Dong Ju Chae, Suk Kang
1Department of Preventive Medicine, Dongguk University, College of Medicine, Korea.
2Department of Preventive Medicine, College of Medicine, dongguk University, Korea.
ABSTRACT
Injuries to the menisci occur in a variety of ways, most commonly with a twist, pivot, squat, or valgus stress to the knee. Tear patterns are classified to longitudinal, horizontal, or transverse features according to the mechanism of injury. Work-related meniscal tear usually occurs with a repetitive usage of the foot, hence it can be classified as a cumulative traumatic disorder. We found a 47 year-old female worker who had been taking charge of repetitive foot-switch stepping for 8 years. She suffered from pain in the right knee since 5 months ago. Tenderness along the medial joint line of the right knee was observed and pain was aggravated with full flexion of the right knee. On magnetic resonance imaging, high signal intensity was observed at the posterior horn of the medial meniscus of the right knee. Degenerative longitudinal and transverse complex tear in the medial meniscus was observed on arthroscopy. Arthroscopic partial meniscectomy was performed. We surveyed the work process and the health status of co-workers. It turned out that the work process was compatible to injure the meniscus and nine out of fourteen co-workers(64.3%) complained pain of the knee. No other factors related to her meniscal tear could be found except for the situation at her work. Therefore, we conclude that meniscal tear is related to the repetitive stepping of foot switch.
Key words: meniscal tear; foot-switch stepping; cumulative traumatic disorders
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