I have don’t have much flexion you sound that is good for you …. I could not straighten either I went for mfr that helped straighten my leg of by 5 degrees now…..I would try mfr before mua …. I had mua all I got out of it was swollen…. I did not retain any of the flexion the dr had gotten….I am almost 10 months out I have new dr and I am going for revision surgery end of July … so good luck to you in whatever you decide to do