Joints of pelvic girdle--- Sacro-iliac joint limited mobility Bones:auricular surface of sacrum and ilium-interlock Capsule:very tight and strengthened by ligaments llium- Sacral canal Posterior sacroiliac Tigament Interosseous sacroiliac ligament Sacroiliac(synovial)joint Anterior sacroiliac Sacrotuberous ligament- ligament Sacrum Sacrospinous ligament Ischial spine Hip bone Sacrum Coccyx terior view of coronal section Auricular (articular) 圈Tuberosity surface Medial view Lateral viewJoints of pelvic girdle--- Sacro-iliac joint : limited mobility Bones: auricular surface of sacrum and ilium - interlock Capsule: very tight and strengthened by ligaments