Hi there. By the looks of it you have either sustained a ligament injury or a mensical tear, both these injuries occur due to a twisting force aaplied to the knee. The anterior cruciate ligament tear mainly occurs when you re tackled during a football match or making a turn while you re on a motorbike commonly. Either way, the initial management is the same. RICE is a good way to do the acute management. Within a few days the swelling will settle down. avoid pitting weight over the affected limb for 2-3 days and as the swelling settles you d find yourself to be able to do so without any difficulty. Having a knee brace is good as it gives some rest to the joints. Ask your physiotherapist to teach you static quadriceps exercises in the beggining and knee range of motion exercises and quadriceps strengthening exercises as you become better. This will take care of most of the minor injuries and tears. in case you have symptoms of locking, which means you ll have these episodes of not being able to extend a flexed knee and there will be a lot of pain, or instability while walking especially on uneven surfaces, that is when you will require an MRI for your knee joint and you will need to show your doctor. So keep up the good job, buy yourself a knee brace for 10 days and watch out for development of locking or instability of the joint. Do as much physio as possible. It is certainly a payoff.