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<v ->Now there is a common disease that occurs

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within the sacroiliac joint.

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Many of you listening to me will get this disease.

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That's the bad news.

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The good news is, it's generally asymptomatic

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and that disease, degeneration of the synovium line joint,

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the disease is called Osteoarthrosis,

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some people call it Osteoarthritis

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and it leads to joint space loss,

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cartilage abnormalities, dominating on the LEM

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and two patterns of osteophyte formation.

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The first pattern occurs at the top

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of the sacroiliac joint right here

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at its junction with the ligament portion.

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I didn't know about that when I arrived in San Diego

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and became a faculty member.

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I read this as carcinoma

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the prostate metastatic to bone, right?

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I had about five more of those cases

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by the end of the week, there was a breakout of carcinoma

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the prostate metastatic to bone.

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I later learned that what I was looking at

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was the osteophyte and bones sclerosis shown here.

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The other osteophyte easy to spot difficult to misdiagnose

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hangs from the bottom of the joint,

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as shown here maybe bridging as in this case associated

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with bone sclerosis,

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easy to diagnose.

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And then if you are dealing with a degenerative process

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that involves not the sacroiliac joint

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but the ligamentous portion of the space

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you have a different name.

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The name for this is a degenerative enthesopathy.

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It may appear as ligament calcification

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or ligament ossification, and it may eventually lead

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to bridge out growths across that space,

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as in this particular specimen, as you see here.

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One final point when dealing with the spondyloarthropathies

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not only do you get sacroiliitis involvement

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of that joint, you get enthesitis.

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So this portion of the interosseous space

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may all also be involved in the spondyloarthropathies

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with ill-defined bone proliferation in this region.

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We've reached the end of the third segment

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and now we turn again to Carlos Longo

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who's going to discuss cases

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related to some of the things we've talked about.