 The source of participants for this study will be the pool of patients who have already elected to undergo TKA surgery under the Principal Investigators care and have requested a surgery date with the scheduling nurse. The study population will consist of men and women aged 45 years and older selected from this source population at the discretion of the investigator who meet the eligibility criteria and voluntarily enroll in the study. There will be no solicitation of potential participants from the community or seeking of referrals for the purposes of recruitment into this study. 