class | symptoms and signs |
0 class | No swelling and pain, no limitation of movement |
I class | There is tension in the popliteal fossa after mild swelling or strenuous activity, and the activity is slightly limited |
II class | Swelling and pain after normal activity, limitation of activity < 20˚ |
III class | Swelling and pain can also occur during rest, limitation of activity > 20˚ |