I was trying to check more with the upper part of my knee since a lot of people are saying its better. But I think it often ends up making contact with the middle or lower part of my kneecap (but my kneecap is not loose since my leg is not extended). I also checked thigh teeps this way (with my leg perhaps a little more extended). My knees are a tiny bit sore. Is checking like this bad for your knee short term or long term? Perhaps arthiritis?