요추 윤상골단골절의 자기공명영상 소견 = MR Imaging Findings of Ring Apophyseal Fractures in Lumbar Vertebrae

다국어 초록 (Multilingual Abstract)

Purpose : To assess the location and associated findings of fractures of the posterior lumbar vertebral ringapophysis as seen on MRI Materials and Methods : We retrospectively evaluated MR findings in 77 patients (86lesions) with lumbar apophyseal ring fractures. Their age ranged from ten to 67(mean 33-1) years. To confirm thepresence of verterbral ring fractures, CT was performed in 29 patients (31 lesions) within two weeks of MRimaging. Open laminectomy was performed in ten patients, percutaneous automated nucleotomy in three, and LASERoperation in four. Results: The most common location of fractures was the superior margin of L5 (36 lesions41.9%), next was superior margin of S1 (21 lesions, 24.4%). On CT, a bony fragment was seen in 28 patients (30lesions); the positive predictive value of MR was 99.7 %. Multiple lesions were seen in nine patients. Associateddisc herniation and bulging were noted in 64 (74.4%) and 15 lesions (17.4%), respectively, and a high signalintensity rim aound the bony fragment on T1 weighted image was noted in 33 (38.4%). Other associated findings werespondylolysis in eight patients, retrolisthesis in five, and spondylolisthesis in three. Operative outcomes werevariable. The results of open laminectomy were better than those of percutaneous automated laminectomy or LASERoperation. Conclusion: In patients with lumbar apophyseal ring fractures, their exact location and associatedfindings could be evalvated by MRI, which was therefore useful in the planning of appropriate surgery.