Group A will be treated with close kinetic chain exercises including static cycling with lifestyle modification and patient's education including quadriceps drill with lifestyle modification and patient's education about 30 minutes per session including 10 min of walking as a warm up for total duration of 12 weeks with 3 sessions per week. Assessment will be done by therapist at 0 week, 4 weeks, 8 weeks and 12 weeks

Group B will be treated with open kinetic chain exercises including quadriceps drill with lifestyle modification and patient's education about 30 minutes per session including 10 min of walking as a warm up for total duration of 12 weeks with 3 sessions per week. Group B performed scar mobilization exercises only for 3 weeks. Assessment will be done by therapist at 0 week, 4 weeks, 8 weeks and 12 weeks

CKC include mini squats, leg press, step-up and step-down, wall slides etc along with their respective modality as quadriceps drill and static cycle ergometer respectively on grade-3 knee OA patients

Pain intensity will be assessed by NPRS. The 11-point NPRS (intervals from 0-10) is used to quantify pain intensity; 0 represents no pain, and 10 represent the worst possible agony. The NPRS is an valid and reliable instrument for older persons. Participants will be asked to select the number that most accurately describes their level of pain. At the baseline assessment, following each exercise session during the 12-week intervention, and finally at the end of the intervention programme, the NPRS scores will be recorded

This questionnaire is designed to evaluate an osteoarthritis patient's level of disability. It consists of 24 items that assess the patient's health and function in a variety of ways, including: clinical symptoms (5 questions), the severity of joint stiffness (2 questions), and daily living activities (17 questions). There are five subscales for each question, with the best situation scoring as never or none and the worst situation scoring as extreme or always. Higher ratings in this case indicate a better position and less suffering. Scores will be recorded after each session of intervention at 0 week, 4 weeks, 8 weeks and 12 weeks

The Osteoarthritis Knee and Hip Quality of Life (OAKHQOL) was created to assess patients with hip and knee OA's quality of life particularly. The OAKHQOL is a reliable and valid tool for measuring the health-related quality of life of people with knee OA. Physical activities (16 items), mental health (13 items), pain (4 items), social support (4 items), social functioning (3 items), and 3 independent items are among the 43 items that make up the OAKHQOL questionnaire, which describes quality of life in five domains. Each item is graded from 0 to 10 on a scale. The mean of all the components constitutes the final score. The sum of all the mean scores will result in a scale from 0 (the highest achievable QOL) to 100 (worst possible QOL)