I landmark by finding the iliac crest and sacrum-I make a triangle shape with my hands and in the middle is where I do the inj. I was taught this by an RN where I work and have had many since him support that method. I never go into the middle of the buttock, always to the side.
Um.......that's how you should have been taught in school. That is the proper way to find your site, and the middle of the butt should never be used.
Great that you're painless inj nurse, not everyone has that quality! I had one pt tell me that he'd received a butt shot from my then-coworker and it had felt like "she was digging a hole in my a** with the end of a pipe!"