Unicondylar meniscal bearing knee replacement

A system of parts for use in unicondylar meniscal bearing knee replacement, the system comprising;

• a plurality of meniscal bearings ranging in size including an extra small bearing having an anterior-posterior length of 29.2±0.5 mm, a small bearing, a medium bearing, a large bearing, and an extra large bearing having an anterior-posterior length of 39.5±0.5 mm, each meniscal bearing comprising a body defining a dished first bearing surface on one side thereof and a second surface on an opposing side thereof;
• wherein each meniscal bearing has an entrapment defined as the difference in thickness between the smaller of the maximum thicknesses between the first and second surfaces at an anterior and posterior end and the minimum thickness between the first and second surfaces, the entrapment of each meniscal bearing being between 3.2 mm at least for the extra small bearing and 3.8 mm at most for the extra large bearing.