Left Knee Meniscus injury and MCL sprain

Doctor Jayant Hello Just to give you a catch up on me. I had this left knee meniscus surgery done 3 weeks back. now all dressing and the pins are out and i have been doing those two exercises half an hour a day. Doctor the stiffness still persists. If I am sitting for a long time and get up its more. At times i also feel a slight pain in case it moves sideways..otherwise walking and driving has been really normal. Have been taking Nucoxia 90 for 18 days now. Is this normal or i should do something more? Thanks a lot for your time. Best Regards Mohit Khemani Ps: More info on me I am Rashmi Hingorani's Brother.