Evidence of a new hereditary joint disorder

While characteristic of osteoarthritis (OA), a degenerative joint disease that affects some 20 million Americans, cartilage erosion and bone abnormalities are also associated with many rare hereditary conditions. In the October 2005 issue of Arthritis & Rheumatism (http://www.interscience.wiley.com/journal/arthritis), researchers at Case Western Reserve University and the University of California, San Diego, report clinical and laboratory findings regarding a family with a highly unusual and extremely destructive syndrome, marked by fragile articular cartilage with a tendency to "bubble" and peel away from the underlying bone.

A 49-year-old male, "MM1" had endured joint pain, invasive treatment, and frustration for most of his life. At age 3, he was labeled with "abnormal bone structure" and subjected to immobilization of both legs. At age 10, he began to complain of knee and hip pain. By age 13, he had lost significant hip mobility and his left leg was shorter than his right. At age 16, he underwent a surgery to separate the hip and insert a plate. Eventually, in his 40s, he had his hip replaced completely. Over the years, MM1 was misdiagnosed with various disorders, including Osgood-Schlatter disease, Legg-Calv-Perthes disease, and spondylo-epiphyseal dysplasia. But what made his case clinically compelling was his children. MM1 is the father of 3 2 daughters, 1 son all of whom suffered similar symptoms, beginning in the preteen years and continuing into adulthood. All 3 children have had multiple arthroscopic procedures on the knees, hips, and shoulders for diagnostic and therapeutic purposes. Both daughters have had total hip replacement surgery. To the research team, this suggested a terribly destructive joint disease with a strong hereditary component.

To gain a clearer sense of this syndrome's distinctive signs, the researchers examined blood samples of bot

Contact: Amy Molnar
John Wiley & Sons, Inc.

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