Migration of CS vs CR Insert in TKA Using RSA

Inclusion Criteria:

• Patients scheduled to undergo primary total knee replacement with the MAKO-roboticarm, with one of the following indications:
• Painful, disabling joint disease of the knee resulting from: non-inflammatorydegenerative joint disease (including osteoarthritis, traumatic arthritis or avascularnecrosis) or rheumatoid arthritis.
• One or more compartments are involved;
• Moderate varus, valgus, or flexion deformity in which the ligamentous structures canbe returned to adequate function and stability (meaning a varus, valgus or flexiondeformity < 15 degrees);
• Age between 18 and 70 years;
• ASA score I or II;
• A good nutritional state of the patient;
• Patients with a completely intact PCL at the time of surgery;
• Patient is able to understand the study and is willing to participate and to sign theInformed Consent;
• Patient is able to speak and write Dutch.

Exclusion Criteria:

• Contraindications manufacturer:
• Any active or suspected latent infection in or about the knee joint;
• Distant foci of infection which may cause hematogenous spread to the implant site;
• Any mental or neuromuscular disorder which would create an unacceptable risk ofprosthesis instability, prosthesis fixation failure, or complications in postoperativecare;
• Bone stock compromised by disease, infection or prior implantation which cannotprovide adequate support and/or fixation to the prosthesis;
• Skeletal immaturity;
• Severe instability of the knee joint secondary to the absence of collateral ligamentintegrity and function;
• Metal in the operative or non-operative leg which lead to the creation ofaccuracy-reducing artefacts in the CT scan;
• Body Mass Index (BMI) of > 35 kg/m2;
• Flexion contracture of 15 degrees and more;
• Varus/valgus contracture of 15 degrees and more;
• History of total or unicompartmental reconstruction of the affected joint;
• Bilateral operation;
• A Total Hip Arthroplasty (THA) on contralateral and/or ipsilateral side within thelast year that is considered to have an unsatisfactory outcome (Patients withcontralateral and/or ipsilateral THA > 1 year ago with good outcome can be included inthe study);
• A Total Knee Arthroplasty (TKA) on contralateral side within the last 6 months that isconsidered to have an unsatisfactory outcome. (Patients with contralateral TKA > 6months ago with good outcome can be included in the study);
• Patients who will need lower limb joint replacement for another joint within one year.
• Active or suspected latent infection in or about the knee joint;
• Osteomyelitis;
• Sepsis;
• A systemic or metabolic disorder leading to progressive bone deterioration, excludingrheumatoid arthritis;
• Vascular insufficiency, muscular atrophy;
• Neuromuscular or neurosensory deficiency, which would limit the ability to assess theperformance of the device;
• Female patients planning a pregnancy during the course of the study;
• The patient is immunologically suppressed or receiving steroids in excess of normalphysiological requirements.
• Patients bone stock is compromised by disease or infection which cannot provideadequate support and/or fixation to the prosthesis;
• A knee fusion to the affected joint;
• Patient has a known or suspected sensitivity or allergy to one or more of the implantmaterials;