I had 2 gracillis muscle transplants (some call them muscle flap surgery) done for anal reconstruction...3yrs apart...the surgery was very, very painful...The muscle is, if I am not wrong, the longest one in the leg...it is an aducter...used to pull the legs together...At first I had no bad side effects other than the obvious...pain, difficulty walking, swelling etc...
I had difficulty skiing after that and had to give up a few sports but not all of them...I reinforced the other muscles over time with weight trainning, walking, climbing and swimming.
Now, over 40yrs later, I have some knee pain (could also be from a fall that I took this summer), maybe a little less stability in the lower limbs...
I think that the big thing is the PT post op, doing all of the exercises and taking your time with the healing.
I assume that it is the same sort of surgery...reassigning a muscle so it will probably be have some similar side effects.
Can't they use a sillicon baloon? An implant? Why do you need one? (then again if you are a woman you may need it to keep your girly parts in place)
Sharon