I had X-rays done 2 years ago and the knee was structurally fine. My range of motion shortly after the replacement (they didn’t give me numbers) was enough to ride a bike and they seemed pleased with that. It has been a gradual change. Two years after the replacement i needed to help my 91 year old mother so my exercise regime went by the wayside. I now walk 3 -4 miles most days and have tried the stationary bike and other exercises that I used in rehab but it’s terribly painful.