Hi, getting rom back after any knee injury is quite difficult,i myself had a patella fracture, so i usually go on the pages under the heading "Bone breaks around the Knee",may-be you should put this topic on to those pages,as so many people on there, have had to have the MUA performed,may-be you will get various opinions and views,to answer your questions on those pages.
I can really sympathise with you being stuck with a low ROM,but apparently,going by what i have read, this procedure is quite aggressive,but fortunately i have now reached full rom, so i do not have to consider this as an option.
I wish you all the best, and good luck.
Coral