sacroiliac
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roʊˈɪlBased on the Random House Dictionary, © Random House, Inc. 2013.
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sacroiliac (ˌseɪkrəʊˈɪlɪˌæk, ˌsæk-) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —adj | |
| 1. | of or relating to the sacrum and ilium, their articulation, or their associated ligaments |
| —n | |
| 2. | the joint where these bones meet |
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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
sacroiliac sac·ro·il·i·ac (sāk'rō-ĭl'ē-āk', sā'krō-)
adj.
Of, relating to, or affecting the sacrum and ilium and their articulation or associated ligaments. n.
The sacroiliac region or cartilage.
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sacroiliac
weight-bearing synovial joint that articulates, or connects, the hip bone with the the sacrum at the base of the spinal column. Strong ligaments around the joint help to stabilize it in supporting the weight of the upper body; the joint's motion is also limited by the irregular surfaces of the sacrum (the fused vertebrae of the lower spine), which closely articulate with the ilium (the uppermost of the three bones composing each half of the pelvis). The sacroiliac's movement is consequently very slight or none at all. The joint is, in effect, narrow vertical slits on the left and right sides of the sacrum where it connects with the ilium bones. The space between the sacrum and the hip bone is occupied by a small cavity filled with synovial fluid (which cushions the joint against pressure) and by a fibrous mass of strong cartilage.
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