Final answer:
The Quadratus lumborum muscle is responsible for referring pain to the gluteal and groin areas and is often linked to lower back pain.
Explanation:
The muscle that refers pain to the gluteal and groin areas, the sacroiliac joint, and is often implicated in lower back pain is the Quadratus lumborum muscle. This muscle is located on each side of the lumbar spine and plays a role in stabilizing the lower back and pelvis. When this muscle is irritated or strained, it can cause referred pain to the gluteal and groin regions.
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