Group A will receive agility and perturbation training techniques in addition to the same routine physical therapy as Group B.

The Agility training exercises include:

• Side Stepping
• Braiding Activities
• Front and Back Crossover Steps During Forward Ambulation
• Multiple Changes in Direction During Walking on Therapist Command

The perturbation training exercises include:

• Double-Leg Foam Balance Activity
• Tilt board Balance Training
• Rollerboard and Platform Perturbations

Group B: Routine physical therapy Group that includes:

• Calf Stretching
• Hamstring Stretching
• Prone Quadriceps Stretching
• Long-Sitting Knee Flexion and Extension
• Quadriceps setting
• Supine Straight Leg Raises
• Prone Hip Extensions
• Standing Hamstring Curls With Cuff Weights
• Standing Calf Raises
• Treadmill Walking
• Mobilization techniques

Group B: Routine physical therapy Group that includes:

• Calf Stretching
• Hamstring Stretching
• Prone Quadriceps Stretching
• Long-Sitting Knee Flexion and Extension
• Quadriceps setting
• Supine Straight Leg Raises
• Prone Hip Extensions
• Standing Hamstring Curls With Cuff Weights
• Standing Calf Raises
• Treadmill Walking
• Mobilization techniques

Numeric pain rate scale will be used to quantify patient level of pain. The Numeric Pain Rating Scale (NPRS) is a subjective measure in which individuals rate their pain on an eleven-point numerical scale. The common format is a horizontal bar or line. Although various iterations exist, the most commonly used is the 11-item NPRS. The 11-point numeric scale ranges from (no pain at all) to 10 (worst imaginable pain) i.e. higher scores indicating greater pain intensity. High test-retest reliability has been observed in both literate and illiterate patients with rheumatoid arthritis (r = 0.96 and 0.95, respectively) before and after medical consultation. For construct validity, the NPRS was shown to be highly correlated with the VAS in patients with rheumatic and other chronic pain conditions (pain>6 months): correlations range from 0.86 to 0.95.

Patients' knee function and stiffness will be measured through the Western Ontario and McMaster Universities Arthritis Index (WOMAC) . It is a self-administered questionnaire consisting of 24 items divided into 3 subscales; Pain-5 items, Stiffness-2 items, Physical Function-17 items .

WOMAC Index was developed in 1982 at Western Ontario and McMaster Universities. WOMAC is available in over 65 languages and has been linguistically validated. The test questions are scored on a scale of 0-4, which correspond to: None (0), Mild (1), Moderate (2), Severe (3), and Extreme (4). The scores for each subscale are summed up, with a possible score range of 0-20 for Pain, 0-8 for Stiffness, and 0-68 for Physical Function. Usually, a sum of the scores for all three subscales gives a total WOMAC score.

36-Item Short Form Survey (SF-36) will be used to assess the quality of life. (SF-36) is an outcome measure instrument that is often used, a well-researched, self-reported measure of health. It stems from a study called the Medical Outcomes Study, which is an objective measure of quality of life. It comprises 36 questions that cover eight domains of health. The 36 questions on the SF-36 are meant to reflect 8 domains of health, including physical functioning, physical role, pain, general health, vitality, social function, emotional role, and mental health.Possible scores range from 0 to 100, with higher scores representing better health status.