I am 7 weeks post spinal fusion L5/L4 surgery. Pre-surgery I was very active, running, swimming, biking, etc.. The Surgeon said to walk as much as I could, so I am walking every day 3 to 5 miles. Sometimes in order to pick something up without bending, I will squat in different ways putting pressure on my knees. Because I started feeling the pain a few weeks ago, I rarely squat, I use my grabber. Can walking harm my knees?