During the time period from 1982 to 1987, 32 patients, 17 females and 15 males, aging 14 to 47, had their lateral discoid menisci reshaped operatively into nearly normal configuration. Final results of the treatment were both subjectively and objectively satisfactory confirmed at the time of re-examinations, 3 to 48 months (25 pts. had been over one year) after operation. Reshaping the discoid meniscus not only brought about normal pattern of it, got rid of symptoms and signs caused by the discoid meniscus-itself, but also by eliminating the horizontal shearing force produced by non-physiological motion of the discoid meniscus, reasonably prevent, at least delay the development of osteoarthritis of that joint.