I had arthroscopic knee surgery on my left knee 3 months ago. I tried letting it heal by sleeping a lot and only walking on it. After 3 months, it was still not healing. So, I decided to get blood flowing to my left knee joint by going to the gym and working out my legs. I do 10 minutes on the Arc Trainer, 10 minutes on a stationary bicycle, and 10 minutes on a rowing machine. This has all been easy on my knee and my knee joint feels stronger and I'm having less pain after one week of working out. I work out once in the morning and once at night. After one week of working out my legs, I've noticed that my left leg is noticeably larger than my healthy right leg. The calf is larger and the thigh area is also larger on my left leg than on my right leg. I am not putting more pressure on my left leg, so I'm confused why my left leg is bigger. It doesn't feel swollen or in pain. It's just bigger.