I got fracture in my left leg about 4 years ago because of which i am not able to bend my knee and hence gained excessive weight. i am not sure how to do exercise with broken leg. could you please tell me how to loose weight in given scenario?

Refer to orthopedics: You are too young to have a fracture that doesn't allow your knee to bend. An orthopedic evaluation, followed by a physical therapy evaluation and treatment exercise plan is a great start. You need a specific diagnosis and a comprehensive treatment plan. The best way to lose weight, in my experience, is with exercise and a plant-based diet combined with a Mediterranean diet and the DASH diet.