GROSS ANATOMY

Detailed explanation-1: -If the sciatic nerve is damaged, it could result in numbness, tingling and, in more severe cases, weakness in the knees or legs. The longer it is left untreated, the longer it will take for numbness and weakness to go away, and they may become permanent.

Detailed explanation-2: -The sacroiliac joint receives its innervation from the ventral rami of L4 and L5, superior gluteal nerve, and dorsal rami of L5-S2. The nerve supply to the SI joint varies between individuals and innervation may be almost exclusively derived from the sacral dorsal rami.

Detailed explanation-3: -The tendon and nerve of obturator internus as well as the pudendal nerve and vessels pass through the foramen.

Detailed explanation-4: -These joints sit where the lower spine and pelvis meet. Sacroiliitis can cause pain and stiffness in the buttocks or lower back, and the pain might go down one or both legs. Standing or sitting for a long time or climbing stairs can make the pain worse.