Good morning all respected doctors. My age 36 year, weight 57 kg. From last 1 month l am Suffering with knee pain left leg (I feel this pain only when I seat for at latrine (Indian style), when I stand up after 5-10 minutes I feel more pain intensity which goes after some time. X ray done, doctor saw x-ray and said that cartilage has been decreased b/w bones. However I feel no pain during following activities:- walking 4 km daily/seating on chair at office/playing badminton 30 minutes daily/ push-up etc. I want to know the following: 1. Why cartilage decreased. I am only 36 years. 2. Whether cartilage recover naturally or will I face this problem long life? 3. Which of the following activities (walking/running/push up/Indian style latrine/ playing badminton etc.) are harmful. Which I continue and which to be stopped. 4. What steps/activities should I follow to reduce further pain, wear-tear and improvements. 5. Which foods/medicines should be taken for improvement. Thanks to all.