The trochanteric bursa is a lovely name for a fluid-filled sack that sits on the outside of your hip bone. It takes the friction of the iliotibial band sliding back and forth across the pointed edge each step you take. It can become inflamed and painful with tight iliotibial bands, pelvic issues, direct trauma like a fall or prolonged sitting in a tight seat.
The pain from the bursa is very local to the spot – often just behind the point of the bone, although when it is very sore it can radiate down the leg. It can be confused with a gluteal tendon without an accurate diagnosis.