GMK-UNI Anatomical UKA: Fixation of Cemented vs Cementless Designs

Inclusion criteria: * Patients with end-stage unicompartmental tibiofemoral osteoarthritis (OA) of the knee that meet the indications for use according to Medacta implants included in this study (on-label use); * Those suffering from unilateral osteoarthritis or osteonecrosis of the medial compartment; * Frontal deformity \< 10° (evaluated on weight-bearing long-axis x-rays); * Flexion contracture \< 10°; * Intact ligaments; * Patients who are willing and able to provide written informed consent for participation in the study. Written informed consent must be obtained prior to the patient's surgery; * Patient's age over 18 years old; * Patient with BMI \< 40 kg/m2; * Patients must be willing to comply with the pre and post-operative evaluation schedule. Exclusion criteria: * Patients with one or more medical conditions identified as a contraindication defined by the labelling on any Medacta implants used in this study; * Any patient who cannot or will not provide informed consent for participation in the study; * Patients who need to undergo lateral unicompartmental knee arthroplasty; * Patients who need a revision surgery; * Patients who need a patella-femoral joint prosthesis; * Patients who had previously undergone high tibial osteotomy or ACL reconstruction; * Patients with BMI ≥ 40 kg/m2; * Patients unable to understand and take action; * Any case not described in the inclusion criteria; * Patients aged under 18 years;