Inclusion Criteria:  Scheduled to undergo unilateral total TKA at one of the study sites TRICARE beneficiary Facility with the English language that is adequate to complete study procedures.  Exclusion Criteria:  Cognitive impairment preventing completion of study procedures, Formal mindfulness training (e.g., MBSR, MBCT) Severe, active suicidality Contralateral TKA in the past 3 months or planned contralateral TKA during the study Current cancer diagnoses.