Patients will be randomized by a number sequence generated by a computer using Microsoft Excel (Microsoft Corporation, Redmond, Washington), in opaque envelopes by researcher who will not attend the study.Patients will be divided into two groups: group with knee patellar hole or group without knee patellar hole. Shortly after the selection of the knee, the patient will have his eyes blind or cover in order to keep it '' blind '' regarding the type of knee brace that it would use.