Hi Ted.
I just started using crutches 2.5 days ago after 15 weeks in a wheelchair with NWB. It does feel good to be upright on both legs after such an extended period, but my knee aches! It feels like a bag of small rocks is in my knee.
I am 25% weight bearing and next week I am to move to 50%. I have been assured that this discomfort, and the swelling at the end of the day, is normal for such injuries. In time it will get better.