Inclusion Criteria:  The subject must provide written informed consent Subject is 18 years or older Willing and able to make all required study visits. Able to follow instructions and deemed capable of completing the KSS and EQ-5D-5L questionnaires Subject is suitable for the CORI Surgical System  Subject requires a cemented TKA as a primary indication due to any of the following condition:  Degenerative joint disease, including osteoarthritis Rheumatoid arthritis Avascular necrosis Requires correction of functional deformity Requires treatment of fractures that were unmanageable using other techniques  Exclusion Criteria:  Contraindications or hypersensitivity to the use of the CORI Surgical System per the Instructions For Use (IFU). Participation in the treatment period of another clinical trial within thirty (30) days of the Pre-Operative Visit, or during the study. Women who are pregnant, nursing, or of child-bearing potential who are not utilizing highly effective birth control measures. Subjects who are non-English speaking. Any subject that meets the definition of a Vulnerable Subject per International Organization for Standardization (ISO) 14155:2011 Section 3.44. Subjects who have participated previously in this clinical trial. Subjects with a history of poor compliance with medical treatment. Subject needs a CORI Surgical System TKA on the index joint as a revision for a previously failed surgery, or need for complex implants, or any other implant than a standard TKA (e.g. stems, augments, or custom-made devices). Subject has been diagnosed with post-traumatic arthritis Subject needs a bilateral TKA Subject has active infection or sepsis (treated or untreated) Subject is morbidly obese with a body mass index (BMI) greater than 40  Subjects with a medical or physical condition that, in the opinion of the Investigator, would preclude safe subject participation in the study. This includes:  Advanced osteoarthritis Joint disease Paget's or Charcot's disease Vascular insufficiency Muscular atrophy Uncontrolled diabetes Moderate to severe renal insufficiency Neuromuscular disease Mental illness or mental retardation Drug or alcohol abuse