SIJ instability You are here: Orthoped > Back and Spine (Chiropractor) Questions > SIJ instability admin 0 Comment Back and Spine (Chiropractor) Questions what can be done for this and is it worth correcting and if left untreated what health problems can occur Related PostsPosture (1) Knee/foot problem (1) syatic nerve- left cheek side-tailbone area (1) Improving Posture (2) Slumping – Clavical Support (1) Drop foot (4)