Flexibele staaf versus standaard staaf bij plaatsing van een totale knie prothese: effecten op passing en functionele uitkomst van de prothese

INTERVENTION: The intramedullary rod is used in TKA to position the femoral component in the correct orientation. The difference between two IM rods is that the flexible IM rod allows for bowing, and thus following the natural anatomy of the femur. There are no extra risks involved with use of the flexible IM rod. CONDITION: Arthrosis, Joint, Wear ; ; PRIMARY OUTCOME: The contour of the distal femur is quantified in (first): the flexion angle of the TKA in the sagittal plane. SECONDARY OUTCOME: 1. The contour of the distal femur is also quantified in the sagittal profile: anterior and posterior. ; ; ; ; 2. Functional outcome measured with: ; ; o Get up and Go test ; ; o Stair climbing test ; ; o Knee power output INCLUSION CRITERIA: • Patient with non‐inflammatory knee osteoarthritis which is radiologically confirmed and which requires total knee replacement • Age between 40 and 75 years, inclusive • Patient plans to be available for follow‐up until two years post‐operative • Patient is in stable health and is free of or treated for cardiac, pulmonary, haematological, or other conditions that would pose excessive operative risk