Final answer:
The piriformis, gemelli, obturator muscles, and quadratus femoris perform lateral rotation of the femur at the hip as their concentric action.
Step-by-step explanation:
The muscles listed - piriformis, gemelli muscles (which include both superior and inferior gemellus), obturator muscles (which include both obturator internus and obturator externus), and quadratus femoris - are known as lateral rotators of the femur at the hip. Their concentric action at the hip is to laterally rotate the femur. While the gluteus muscles are responsible for extension and abduction of the femur, these particular muscles operate deep to the gluteus maximus and are specialized for rotating the thigh. The piriformis is noted to also assist in abduction of the thigh when the hip is flexed, such as in crossing one leg over the other in sitting position.