Hi Doctor. I am a chartered accountant and therefore have to sit continuously in office for hours. For long hours, I used to sit with legs bent on a chair. 6 months ago, I started to feel paid around the knee joints. First, I felt it in left knee and then after sometime it started in right knee as well. After 2-3 months, I started hearing knocking sounds when I move my knee. I tried to put ice on the knee. The pain goes away when I put the ice, however, it comes back when I keep the knees bent even for 5 minutes. Now it feels knees are starting to become weak. I am 27 years old and have led a healthy life. However, I have increased weight recently. Currently the weight is around 75 kg.