Analysis Of The Sacroiliac Complex And Its Biomechanical Significance Using A Three-Dimentional Finite Element Model

Objective:Sacroilac complex lies in the center of posterior pelvic ring and is the most important structure that supports body weight and transmits stress,which anatomical and functional integrality plays a significant role in maintaining the stability of pelvic ring.The sacrum connects with two ilia through bilateral sacrospinal, sacrotuberous and (anterior , interosseous and posterior) sacroiliac ligaments anatomically and functionally.Nowadays biomechanical research shows that pelvic stability and kinetics rely on its surrounding powerful intrinsic links such as pubic symphysis and sacroiliac ligaments besides extrinsic ligamental complexes (sacrospinal,sacrotuberous and iliolumbar ligaments),but anterior conjunctive structure(anterior arch and pubic symphysis) only provides 40% of pelvic functional integrity because congenital absence(bladder exstrophy) or resection of anterior linkage (tumor excision) doesn't lead to complete loss of pelvic stability.So sacroiliac complex plays an important role in maintaining 60% of pelvic stability and integrity.However,clinicans usually pay no adequate attention in restoring stability of sacroiliac complex during pelvic operation since either pelvic fracture or resection of sacral tumor damages the integrity of sacral complex and causes pelvic instability,resulting in high incidence of disability.As a result clinical prostecdtive efficacy of pelvic injury is not satisfactory.The experiment includes 3 parts according to clinical practice: firstly to find the method of anatomical three-dimensional element model(FEM) construction of pelvic and sacroiliac complex and discuss its...