1. Prostheses of knee joint menisci implanted in place of worn-out native menisci in order to prevent articular cartilage damage of the femoral and tibial condyles and stop the progressive development of osteoarthritis the prostheses of the meniscus are made in size and congruent with the surfaces of the femoral and tibial condyles have a reinforced structure to ensure strength and durability are made of materials having elastomeric characteristics similar to those of native meniscus materials are made in a solid monolithic form by assembling from layers of a solid material separated by layers of a thin elastic sheet reinforcing material have support surfaces treated with chemical and (or) mechanical methods to improve the effectiveness of lubrication with synovial fluid are limited in movement within the interarticular space by means of several fixing elements of various shapes distributed around the circumference in the area between the meniscus prostheses and circumferentially surrounding fixing bands have additional internal elements for increasing stiffness and stabilization, additional external elements for increasing stiffness and additional strips for connecting their ends to transfer circumferential stresses. Prostheses of the knee joint meniscus of claim 1, wherein the movement of the meniscus within the interarticular space is reliably limited to several circumferentially located fixation elements located in a more or less annular region, usually occupied by the ligament joint distributed around the circumference in the zone between the meniscus prostheses and circumferentially surrounding fixing bands have additional internal elements for increasing stiffness and stabilization, additional external elements for increasing stiffness and additional strips for connecting their ends to transfer circumferential stresses. Prostheses of the knee joint meniscus of claim 1, wherein the movement of the meniscus within the interarticular space is reliably limited to
