ROMTECH PortableConnect Rehabilitation Device Usage Post Unilateral Total Knee Arthroplasty (TKA)

Inclusion Criteria: * Male or female ≥18 years of age at screening visit. * Documentation of a definitive diagnosis of osteoarthritis of the knee requiring total knee arthroplasty. * Scheduled or willing to schedule TKA procedure within the timelines consistent with the study enrollment period. This includes up to a 28-day screening window prior to the scheduled surgery. * Willing to consent to outpatient, home-based physical therapy, CPM, or the ROMTech protocol * Able to provide written informed consent. * Willing and able to participate in and complete all study assessments, questionnaires, and procedure Exclusion Criteria: * Inability to provide informed consent. * Inability to understand and complete study related assessments and procedures. * Other scheduled surgical knee procedures in addition to the TKA. * Presence of a condition or abnormality that in the opinion of the investigator would compromise the safety of the subject or the quality of the data. * History of musculoskeletal or neurological disorders that limit physical function including but not limited to severe spine OA, contralateral leg issues limiting mobility, and other disorders as identified by the investigator * Planned additional knee joint surgery within 3 months of the primary scheduled TKA