Hi, thanks for writing to HCM.
Classical description of knee injury
while playing football and pain while doing bending activities indicate "Meniscal injury" unless proved otherwise.Meniscus
acts as a "shock absorber" and is present between the two bones of the knee joint (femur
). They commonly get injured during sudden twisting strains involving knee joint which generally happens while playing foot ball or other high impact sports.
Temporarily use ice packs, analgesic
medications, compression knee cap if you have swelling , avoid running and jumping.
I suggest you to undergo MRI scan of knee joint and consult an orthosurgeon for his advice.
Hope this helps