TRabecular Metal Economic and Clinical Knee Trial

Inclusion Criteria: * Male or female subjects may be recruited to the evaluation. * Age - there are no restrictions relating to age of the patient. * 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 investigation procedures and are willing to return to the hospital for all the required post-operative follow-ups. * Subjects with uni-lateral osteoarthritis of the knee or subjects with bi-lateral osteoarthritis of the knee, who have a well functioning and pain free knee replacement in the contralateral knee. * Subjects who require a TKR for surgical management of osteoarthritis Exclusion Criteria: * Patients who, in the opinion of the Investigator, have an existing condition that would compromise their participation and follow-up in the study. * Patients with bi-lateral disease that significantly impacts on their current function and pain. * Patients who require revision knee arthroplasty surgery. * Disorders of the feet, ankles, hips or spine causing significant abnormal gait or significant pain. * Neurological conditions affecting movement. * Patients with a pathology, which, in the opinion of the Chief Investigator, will adversely affect healing. * Patients with other disorders which, in the opinion of the Chief Investigator, will/could impair rehabilitation. * Subjects who in the opinion of the study investigator are unlikely to comply with the study follow-up protocol