Gluteus Maximus Pain- Also Sciatic Nerve and Piriformis
Most of the time the Gluteus Maximus is not the problem area. It usually is the Piriformis muscle located just under the GM.
When the Piriformis and the sciatic nerve are inflamed you can take on a posture like this when standing or walking.
This is the Piriformis and the sciatic 4 pathways. #1 is the normal way behind the Piriformis. #2 Is when the sciatic splits and forms around the Piriformis exposing the nerve to more pressure from sitting or falling. #3 & 4 are cutting through the Piriformis causing much more pain because of irritation when the Piriformis muscle swells.
This illustration is showing all the attachments of the muscles near the hip joint and under the GM. Notice the Piriformis is webbed in with other muscles that look almost the same. These other muscles are part of the 6 lateral rotators of the hip.
RX is always Ice 30 minutes 2x day on the painful area (Sit on Ice on soft seat). Take anti-inflammatory, and stretch doing the Piriformis Stretch
When stretching try to hold on to the shin if you can and pull gradually towards your body. This is the most effective way to stretch the Glutes and Piriformis.