The clinical investigation is designed to be prospective to ensure that the population is representative of the type of population for which the Freedom Total Knee® System with the revision components is intended to treat. Subjects with a primary diagnosis of end-stage symptomatic revision knee who require a uni-lateral knee prosthesis and have been evaluated as appropriate candidates for a revision total knee arthroplasty, by the Investigator, will be invited to take part in this clinical investigation. Patients will be drawn from hospital clinics focusing on this type of treatment.