We investigated the end-results of 28 patients (30 limbs), and performed arthorography at 14 patients (15 limbs) of them. The end-results of definite lesions of the menisci was very good (91.7%), but that of the loose menisci was no better than the former. Therfore it is necessary to determine the exact diagnosis before the operation. The arthrosis derormans was not ensued from neniscotomy, but at only one limb remarkably grew the spicule-making of the bone edge, however it was independent of the functional end-results. The regeneration of menisci after operation was recognized to have some differences among the types of damage of menisci and the individuals. The regeneration of the menisci on the cases of damage at the attaching point of the joint capsule was rare, but this was also independent of the functional end-results.