[Are sacrospinal and sacrotuberal ligaments involved in sacro-iliac joint stability?]. / Rôle biomécanique des ligaments sacroépineux et sacrotubéral sur la stabilité de l'articulation sacro-iliaque Anatomie et étude expérimentale originale.

OBJECTIVES: Surgery of pudendal nerve entrapment needs the section of both sacrospinal and sacrotuberal ligaments. We asked about the potential side effect of such a section especially on sacro-iliac joint stability. MATERIAL AND METHODS: We performed a cadaveric anatomical and biomechanical study concerning six sacro-iliac joints. Joints were tested on a plateform, and results were analysed with a logiciel (Medai((R))), both especially developped for, before and after sacrospinal and sacrotuberal section. RESULTS: The computered analysis of our results proved that sacro-iliac joint has a significant range of motion, specially in youngs. Results obtained confirmed that there is no statistical difference (p<0.05) between the mobility of sacro-iliac joint with or without sacrospinal and sacrotuberal ligaments. CONCLUSION: This original experimental biomechanical study is the first able to test the influence or sacrospinal and sacrotuberal section on sacro-iliac joint stability. The section of those ligaments has no significant experimental consequence on the sacro-iliac joint stability and cannot create a postoperative instability.