Background and purpose:Osteoarthritis(OA) is a progressive degenerative condition resulting from the cartilage wear and tear that leads to knee joint deformities and functional limitations. Total knee arthroplasty (TKA) has become the gold standard treatment for surgically managing knee osteoarthritis, but physical rehabilitation after surgery is critical for returning function to pre-surgery levels. The purpose of this case report is to describe the effectiveness of physical therapy intervention and report outcomes following a right TKA. Case Description:The present case report describes the 12-week outpatient physical therapy rehabilitation of an 86-year-old woman who underwent right-sided TKA. She suffered from knee pain and limited ambulating speed since three years. During outpatient rehabilitation patient received treatment for improving functional mobility, ROM, strength, and gait training. Outcomes:During course of 12 weeks of physical therapy rehabilitation improvement was seen in pain from 2/10 to 0/10 on NPRS, flexion ROM from 110degrees to 130 and strength from 3-/5 to 4/5 on MMT. Additional outcome measures that showed improvement includes Time Up and Go Test (TUG) for mobility from 16.5 to 14.97 seconds and gait speed 0.6 m/s to 0.78 m/s. She was able to accomplish both short-term and long-term goals. Discussion:This study supports that early mobilization and therapeutic exercises in post knee arthroplasty can improve functional outcomes and help patient to return to the prior level of function. Although, it is recommended that further research is needed to be done on a larger population to establish its effectiveness.