Factors associated with failure of bony union after conservative treatment of acute cases of unilateral lumbar spondylolysis

Abstract Background If bone union is expected, conservative treatment generally selected for lumbar spondylolysis. However, sometimes treatments are unsuccessful. We sought to determine the factors associated with failure of bony in acute unilateral spondylolysis marrow edema including contralateral pseudarthrosis. Methods This study targeted treated conservatively high school or younger students. Conservative therapy was continued until disappeared on MRI and investigated by CT. conducted a univariate analysis sex, age, pathological stage, lesion level complicating defect, level, intercurrent spina bifida occulta, variables p < 0.1 were considered logistic regression analysis. An item 0.05 defined as factor union. Results found 92 cases 66 successfully conservatively. Failure progressive stage ( = 0.004), pseudarthrosis 0.001), L5 0.002). The odds ratio 20.0 (95% CI 3.0–193.9) 78.8 13–846) pseudarthrosis, 175 8.5–8192) level. Conclusions aiming at contraindicated when progressive, L5, there pseudarthrotic