Authors: S Yi S H Kim H C Shin K N Kim D H Yoon
Publish Date: 2007/09/17
Volume: 149, Issue: 11, Pages: 1139-1145
Abstract
Methods This study includes 33 thoracic discectomies in 29 patients with a ventrally situated herniated thoracic disc reaching to the thoracic cord Using preoperative computed tomography scanning and magnetic resonance imaging the direction of the disc was classified as either central or lateral and disc consistency classified as either soft or hard Clinical outcome was assessed according to the Japanese Orthopedic Association JOA Score for thoracic myelopathy The score was obtained by analysing motor sensory and bladder function Recovery rate was assessed comparing preoperative and postoperative status based on disc characteristics The correlations between outcome symptom duration and recovery rate were also investigatedFindings Clinical outcome according to the JOA Score showed significant postoperative improvement increasing from 70 ± 31 points to 82 ± 27 points postoperatively p 001 The mean recovery rate was 124 ± 569 and 16 patients 552 showed improvement In the soft disc group there was improvement in all categories but the hard disc group showed no improvement The central disc group showed improvement in sensory function but the lateral disc group showed little improvement Regression analysis revealed a statistically significant correlation between the preoperative and postoperative score symptom duration and recovery rateConclusions Clinical outcome after surgery of a herniated thoracic disc proved successful especially when the disc was considered to have a soft consistency In order to decide the optimal surgical strategy and prospective surgical outcome disc characteristics including consistency and direction of prolapse should be considered preoperatively
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