A Comparison of Two Surgical Techniques Using the Unity Knee™ Total Knee System

Inclusion Criteria: * Subjects suitable for the Unity Knee™ Total Knee System according to the product "Instructions for use" * Over 18 years old * Male and female subjects who are skeletally mature * Subjects who have a smartphone (iOS or Android) with internet connection via mobile Internet data or Wi-Fi connection * Subjects able to understand what is expected of them and be able to comply with the study protocol requirements Exclusion Criteria: * Any subject listed for a revision total knee replacement or conversion of a unicondylar replacement to a total knee replacement on the operative knee * Any subject with fixed flexion contracture greater than 20 degrees * Any subject with varus/valgus deformity greater than 15 degrees * Any subject with confirmed osteoarthritis or other pathologies affecting the contralateral knee that is anticipated to require surgery within 12 months * Any subjects with contralateral knee replacement that is anticipated to require revision surgery within 12 months * Any subject whose prospects for a recovery to independent mobility would be compromised by known co-existent, medical problems * Any subject with a known sensitivity to device material * Any subject who is pregnant * Any subject currently a prisoner * Any subject known to be a drug or alcohol abuser, or have a psychological disorder that could affect follow-up care or treatment outcomes * Any subject currently involved in any personal injury litigation, medical-legal or worker's c…