Hi Celia, I have shredded meniscus and once hurt my knee on the bike. I think I injured it because I had my foot not straight but at an angle and I was in a hurry to finish up and ignored the slight pain I was feeling. Then to make matters worst I went into the city and did 2 museum tours because at that point it really didn't hurt that much. Well the next day I paid for it. I could barely walk and couldn't to the bike much less walk right for several months. Now when I'm on the bike I pay attention to my foot position and I never do the bike if I'm in a hurry. The good news is my legs have gotten much stronger. I can take a bath and not have to worry about getting in and out of the tub. Wish you all the best !