Background: Most people with increasing age are suffering from different kinds of joint diseases, among them, Osteoarthritis (OA) is the most common one, which is a clinical condition of joint pain and dysfunction brought on by joint deterioration. The knee is the most prevalent location for OA, even though various lower extremity joints, including the ankle and hip, may be affected. OA raises the risk of morbidity and death, causes pain and disability, and lowers the quality of life. Increased age and Body Mass Index (BMI) is the most common risk factor for developing knee Osteoarthritis (knee OA), and also females are more prone to develop knee OA. It has been proven that exercising regularly can lessen the discomfort caused by knee OA.

Aim:  The aim of the study is to find the relation between core muscle strength with rectus femoris flexibility and quadriceps strength in obese and non-obese patients with knee OA.

Methodology: Obese and non-obese participants aged 40 to 70 will be recruited according to knee OA grade 2 and 3. The demographic data of the participants will be allocated to the obese and non-obese groups. Then the participants will be assessed for core muscle strength, rectus femoris flexibility, and quadriceps strength and the data obtained will be compared for both groups. Outcome measures like Pressure Biofeedback Unit, Isokinetic Dynamometer, Ely’s Test, and Visual Analogue Scale (VAS) will be used for the assessment.

Data analysis: Kolmogorov-Smirnov test will be applied to check normality. If the data is found to be normally distributed, the independent t-test will be used between groups. If the data is not found to be normally distributed, then the Mann-Whitney U test will be used.