In the Advanced course we do discuss Medial cluneal nerves and they can mimic SIJ pain. Aoti describes an entrapped Medial cluneal that is differential Dx for SIJ pain. Needling the Posterior SI capsule is safe but requires a thicker gauge needle to get there and have an effect. The joint has innervation of the front and back of it that differs slightly but S1-S3 are primary and can be accessed via the cutaneous of the medial cluneals.
