Discovered this site today. It's really amazing--and shows why we THRs can have so many different aches & pains--because so many of these muscles are pushed, pulled, cut or otherwise "beat up" during THR surgery, or just plain old in the general area! For those who have the time and/or interest it's really worth checking out! (Be sure to try the +/- scale--it strips away all the overlapping layers so you can really see the origin & insertion points of any single muscle & visualize where it is in relation to your hip surgery site.)
https://www.getbodysmart.com/ap/muscularsystem/thighmuscles/anteriormuscles/menu/menu.html
https://www.getbodysmart.com/ap/muscularsystem/thighmuscles/anteriormuscles/menu/menu.html