I basically had the same question as you. Since my last post, I have been tolerating more weight and walking with a fuller stride. I think that has been helping with ROM. Also, the PT put on kinesiotape 2 days ago. I’ve been hearing a lot of popping and the skin is not as tight and swollen so I think it is helping. ROM is beginning to progress!!
Your ROM is still better then mine ( I am now 70 degrees!!!!!) but as long as I am improving I will not consider MUA. I have read a lot of posts on TkR saying that ROM continues to increase after a year.