Hi Doctor I have some doubts about knees

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Mri not needed unless patella dislocates again Start moving the knee yourself All will be well

Your doctor did right in giving you a cast. That's the best way to immobilize the knee, so that in these 3 weeks the tears in your soft tissues around the patella can get enough time to become sticky and start healing. Unfortunately any joint if placed in a plaster, even normal joints will get into stiffness due to disuse. We will.be able to get full range of movement back in the knee but not before we are sure that the healing has happened adequately. Which can take 1.5 to 2 months. Even upto 6 months. So I say don't be in a hurry to start physio. Give yourself time and eventually when you do start physio give your 100% and you will do well. Mri is not a problem , it will list which ligaments are torn and how much. But wont change the treatment plan.

rest assured, take a vitamin d injection to speed up healing

consult if needed