Suggest Remedy For Inability To Extend The Left Leg Fully

I had surgery 2 weeks ago. There was a 13mm x 13mm hole at the top front of my left tibia. The surgeon put 10 pieces of donor bone in the hole. I had my followup appointment last week and the surgeon told me to get rid of the leg brace and begin applying weight to my left leg using crutches. I have been doing this now for almost a week. The area around my knee is still very sensitive. I can only bend my left leg to about a 40 degree angle without severe pain. When I lie in bed, I cannot fully extend my left leg and getting into a comfortable position is almost impossible. Is there anything I can do to get through this quicker or am do I just need to live with the (hopefully) temporary discomfort.