Quad exercises...if you have time and you are able strengthen quad muscles before surgery. I'm 9 weeks post op... the week of surgery I didnt have the quad strength to lift my leg into bed. I now bike 1.5 miles in 10 minutes, leg press 125 lbs, hamstring curl 50 lbs, can walk about 1 mile per day, do squats. I've resumed all household chores, including laundry and dinner, go grocery shopping including went xmas shopping...discontinued pain meds at 2 weeks and take ibuprofen for swelling. Moderate swelling but doctor said it's normal. Started work from home 2 weeks post surgery, back in office 8 weeks post surgery. No pain, only symptoms are moderate swelling and some stiffness....I attribute my progress to the quad exercises that I did for a month prior to surgery...I continue to do exercises at home, ice and elevation and I'm finishing PT 2x per week...Extension is 0 degrees Flex is 120 degrees.