Maxx Orthopedics' PCK Revision TKA Study of Component Survivorship

Inclusion Criteria: * Male and female subjects aged 40 years of age or older and less than 80 years of age (\>40 and \<80 years). * Patients having undergone a primary TKR and are candidates for a revision surgery based on aseptic loosening, infections, bone loss, MCL disruption, and/or periprosthetic fractures. * Patients who understand the conditions of the study and are willing and able to comply with the post-operative scheduled clinical and the prescribed rehabilitation. * Subjects who, in the opinion of the Investigator, are able to understand this clinical investigation, co-operate with the investigational procedures and are willing to return to the hospital for all the required post-operative follow-ups. * Subjects who are able to give voluntary, written informed consent to participate in this clinical investigation and from whom consent has been obtained. Exclusion Criteria: * Primary knee replacement of the affected knee joint * Other significant disabling problems from the muscular-skeletal system than in the knees (i.e muscular dystrophy, polio, neuropathic joints) * Obese patients where obesity is severe enough to affect subject's ability to perform activities of daily living. * Patients who are found to be non-compliant by their physician * Patients with or having; malignancy - active malignancy, active or suspected systemic infection, Paget's disease, renal osteodystrophy, immunologically suppressed, sickle cell anemia, and systemic lupus erythmatosus. * The patient has a neuromuscular or neurosensory deficit. * Female patients planning a pregnancy during the course of the study. * Patients, who are mentally incompetent or are unlikely to be compliant with the prescribed post-operative routine and follow-up evaluation schedule. * Varus or valgus deformity \> 20 degrees * Bilateral TKR