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00152232-201110001-00126AbstractSpine: Affiliated Society Meeting AbstractsSpine: Affiliated Society Meeting Abstracts© 2011 Lippincott Williams & Wilkins, Inc.October 2011 p PREVALENCE AND RADIOLOGICAL CHARACTERISTICS IN PATIENTS WITH LOWER THORACIC OSSIFICATION OF YELLOW LIGAMENTGP129.GENERAL POSTERSLee, Hwan Mo1; Park, Si Young2; Chae, In Jung3; Kim, Ho Joong4; Suh, Seung Woo31Yonsei University, Orthopaedic Surgery, Seoul, Republic of Korea; 2Orthopaedic Surgery, Seoul, Republic of Korea; 3Korea University, Seoul, Republic of Korea; 4Yonsei University, Seoul, Republic of KoreaINTRODUCTION: Ossification of yellow ligament(OYL) has been recognized as a relatively rare cause of thoracic myelopathy. It usually developed at lower thoracic spine. The diagnosis of thoracic OYL is usually delayed or missed due to ignorance and insidious onset of symptoms; it is usually present with other lumbar spine disorders. According to developments of diagnostic tools, incidental discover of thoracic OYL has increased even in L spine MRI. However, the epidermiology and etiology of OYL remained obscure. We performed this cohort study to find prevalence and etiology of thoracic OYL in patients with problems at lumbar spine.METHODS: All 2425 patients (1319 women, 1106 men) between 6 and 94 years of age (mean 57.9 years) who had taken L spine MRI for 2 years were recruited for this cohort study. At the result of review, 66 patients with OYL, low signal intensity on the T2 sagittal image in posterior aspect of spinal canal, were identified. Medical records of these patients were reviewed. We also made a control group (randomized, age and sex matched) from same cohort and compared radiological characteristics with OYL patients.RESULTS: The prevalence of OYL among patients with problems of lumbar spine was about 2.7% (47 women, 19 men). The OYL at lower thoracic area are more common in female and older age. (p<0.0001) 65% were single level involvement and the most frequent involved level was T10-T11(43%). In OYL group, Osteophyte formation (odds ratio: 6.99) at the level and loss of disc height (odds ratio: 4.09) were more common. The more degenerated change of disc at the level was detected in OYL group. The thoracolumbar kyphosis and underlying lumbar pathology were not related with OYL.DISCUSSION AND CONCLUSION: OYL at lower thoracic spine is not rare condition, especially in female and older age. Anterior ostephytes, disc space narrowing and degenerated changes of disc at the level are risk factors of OYL.<strong xmlns:mrws="http://webservices.ovid.com/mrws/1.0">PREVALENCE AND RADIOLOGICAL CHARACTERISTICS IN PATIENTS WITH LOWER THORACIC OSSIFICATION OF YELLOW LIGAMENT</strong>: <strong xmlns:mrws="http://webservices.ovid.com/mrws/1.0">GP129.</strong>Lee Hwan Mo; Park, Si Young; Chae, In Jung; Kim, Ho Joong; Suh, Seung WooGENERAL POSTERSGENERAL POSTERS