Percentage of patients 18 years of age and older who obtained at least a minimal clinically important difference (MCID) in knee pain or function as measured by validated patient-reported outcome measures (PROMs) completed up to 90 days prior to and at least one year after undergoing primary total knee arthroplasty (TKA) surgery. PROMs include knee-related measures of pain and function (KOOS-Pain, KOOS-PS, KOOS-JR, KOOS-KRQoL).