Mohammad Reza Etemadifar, Abdollah Hadi
Orthopedic Surgery Department, Alzahra Educational Hospital, Isfahan University of Medical Sciences, Isfahan, Iran

Mohammad Reza Etemadifar et al.386Asian Spine J 2015;9(3):386-393Copyright Ⓒ 2015 by Korean Society of Spine SurgeryThis is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Asian Spine Journal • pISSN 1976-1902 eISSN 1976-7846 • www.asianspinejournal.orgReceived Sep 29, 2014; Revised Nov 13, 2014; Accepted Nov 25, 2014Corresponding author: Abdollah HadiOrthopedic Surgery Department, Alzahra Educational Hospital, Isfahan University of Medical Sciences, Isfahan 8174675731, IranTel: +98-3136255555, Fax: +98-3136692174, E-mail: dr.hadi74@yahoo.comClinical Findings and Results of Surgical Resection in 19 Cases of Spinal Osteoid Osteoma Mohammad Reza Etemadifar, Abdollah Hadi Orthopedic Surgery Department, Alzahra Educational Hospital, Isfahan University of Medical Sciences, Isfahan, Iran Study Design: Descriptive cases series.Purpose: To evaluate clinical findings and results of conventional surgery in patients with spinal osteoid osteoma (OO).Overview of Literature: OO is a rare benign tumor with spinal involvement rate of about 10%–20%.Methods: This descriptive study was conducted on 19 patients (11 males and 8 females with an average age of 19.8 years) with doc-umented histopathological and imaging findings of OO referred to a university hospital. Neurologic symptoms and pain were scored before and after the open surgical excision. Data were analyzed by SPSS ver. 16 software using chi-square and significance level of 0.05.Results: The most common complaint was back or neck pain (84.2%) and in 68.4% spinal deformity (mostly scoliosis) shown with an average cobb angle of 21° at presentation. The sites of involvement were 35% in the lumbar, 35% in the thoracic, 25% in the cervi-cal, and 5% in the sacrum. Lamina was the most common site (50%) of involvement with predilection for the right side (p=0.001). All patients were treated by conventional surgical excision with a complete recovery of pain and deformity. No recurrence occurred after a mean follow up of 44.5 months, but 4 of 19 cases instrumented because of induced instability. In one case there were two levels of involvement (C7–T1) simultaneously. Interestingly, 10 out of 19 of our cases belonged to a specific race (Bakhtiari).Conclusions: Surgical intra-lesional curettage is potentially an effective method without any recurrence, which can lead to sponta-neous scoliosis recovery and pain relief. Race may be a potential risk factor for spinal (OO).Keywords: Osteoid osteoma; Bone tumor; Surgical outcoms; Spine

IntroductionOsteoid osteoma (OO) is a primary benign bone lesion that was first described by Jaffe [1] in 1935. He has again proposed the new term of benign osteoblastoma in 1956 [2].OO accounts contributes for approximately 12% of be-nign skeletal neoplasms arising in the cortical bone espe-cially in long bones, and spinal involvement of 10%–20%. In some papers up to 40% spinal involvement has been reported [3,4].It can develop in any area of spinal column but, mainly involves the lumbar spine with predilection for posterior elements in 75% of cases especially lamina or sectors of 2–4 and 9–11 in Weinstein-Boriani-Biagini (WBB) clas-sification (Fig. 1) [5,6]. Pars interarticularis is the most common (73%) site of involvement [5].Most of the cases occur in the second decade of age, but variation spans from the first to fourth decade with a male to female predominance of 2:1 [7,8]

Copyright Ⓒ 2015 by Korean Society of Spine SurgeryThis is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Asian Spine Journal • pISSN 1976-1902 eISSN 1976-7846 • www.asianspinejournal.org

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