抄録
A clinical study was made on 13 patients (14 joints) with regard to the association between osteoarthritis and medial meniscus tear. There were 12 males and one female. Their mean age was 39.5 years with a range from 21 to 65 years.
Two patients had coxarthrosis, but the cause responsible for the tear could not be established in the remaining patients. No patient had osteoarthritic changes either roentgenographically or arthroscopically.
The type of tear of these patients was characteristic. A flap and a horizontal tear always existed on the posterior segment of the medial meniscus. These tears were considered to be degenerative ones, and they may be the early stage of medial-type osteoarthritis for their specific location. Roentgenographical study revealed that the tibial posterior declining angle of these patients was significantly less than that of the control group. The decreases in declining angle may thus cause an abnormal stress on the medial meniscus.
