in addition to the shape of the joint what other passive structure adds form to closure
Answers
Explanation:
The Sacroiliac Joint (SIJ) is a synovial joint between the auricular surfaces of the sacrum bone and the two ilium bones [1]. The auricular surfaces are covered in hyaline cartilage and are broader above and narrower below. The SIJ is also a true diarthrodial joint, as it has a joint space, filled with synovial fluid between the matching articulating surface and a fibrous capsule. However it is different to other diarthrodial joint as it has fibrocartilage and hyaline cartilage on the auricular surfaces [2]The SIJ main roles' are to provide stability and offset the load of the trunk to the lower limbs.[3] The SIJ has a high level of stability from the self locking mechanisms of the pelvis, which comes from the anatomy and shape of the bones in the SIJ ('Form Closure) and also the muscles supporting the pelvis ('Force Closure)