It is assumed that the frequency of the meniscus tear on the right and the left knee and the mechnism of injuries in westerners are different from those in easterners.
The writer had experienced 32 cases of the meniscus tear in National Police Hospital, during the period from 1973 to 1977, and inquired into its frequency and cause based on appropriate references. This is the report on the result of our study.
1. Out of 32 cases, 21 cases were found in the group of 20 to 29 years of age.
2. Eleven years of age with a discoid type was noticed as the youngest.
3. Out of 32 cases, 20 cases were found on the lateral meniscus and 12 on the medial, showing every five lateral cases to .everyjthree medial cases.
4. Out of 32 cases,` 17 cases were found on the right knee joint with 14 lateral and 15 on the left knee joint with 9 medial.
5. Out of 32 cases, 27 cases were found on the male and 5 on the female, showing 5.4 male cases to every one female case..
6. Out of 32 cases, 29 cases had the apparent history of trauma.
7. Transverse tear was found more frequent on the lateral meniscus and longitudinal or bucket handle tear was found more frequent on the medial meniscus.
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