The Press Fit Condylar (P.F.C.) Sigma Rotating Platform (RP) TC3 Revision Knee in Revision Knee Arthroplasty

Inclusion Criteria: * Male or female subjects over the age of 21 years (and skeletally mature). * Subjects who are able to give voluntary, written informed consent to participate in this investigation and from whom consent has been obtained. * Subjects who, in the opinion of the Investigator, are able to understand this investigation, co-operate with the investigational procedures and are willing to return to the hospital for all the required post-operative follow-ups. * Subjects whose primary diagnosis includes non-inflammatory or inflammatory degenerative joint disease. * Subjects who require revision of any previous knee arthroplasty. * Subjects who, in the opinion of the Clinical Investigator, are considered to be suitable for treatment with the investigation device, according to the indications specified in the package insert leaflet. * Subjects who require revision of the femoral and/or tibial components. (Both components must be replaced as part of the study.) Exclusion Criteria: * Subjects who, in the opinion of the Investigator, have an existing condition that would compromise their participation and follow-up in this study (including malignancy, severe osteoporosis or disabling musculoskeletal problems). * Women who are pregnant. * Subjects who are known drug or alcohol abusers or with psychological disorders that could affect follow-up care or treatment outcomes. * Subjects who have participated in a clinical study with an investigational product in the last 60 days (excluding any primary knee replacement study). * Subjects who are currently involved in any injury litigation claims. * Subjects with global instability, deficient extensor mechanism or severe bone loss (eg. due to fracture or tumour resection). * Subjects who have had their contralateral knee replaced within the previous 6-month period.