well suddenly you make a wrong movement and that's how it can happen
no
The quads are responsible for extending the knee joint, while the hamstrings are responsible for flexing the knee joint. Together, they work in opposition to produce movement and stabilize the knee during activities like walking, running, and jumping.
ROM stans for Range of Motion/Movement so it mean how much does the knee move. Normal rnage of movement for the knee is approx 0-160 degrees
age
During swimming, finning is a type of movement. Finning is known as when the movement looks like a fish fin
cruciate
it depends on what stroke you are swimming. if you are swimming breaststroke then you do bend your knee in freestyle and backstroke you don't bend your knee. in butterfly you only snap your whole leg your knee doesn't bend all the way. if you don't kick the right way in breaststroke then you can hurt your self becareful and ask a coach. good luck
no
Swimming
seek medical advice as there are a number of issue that occur to the knee which swelling indicates
flexion of the knee.