Pain relief after CT-guided pars injections in lumbar spondylolysis: analysis of MRI findings and CT-contrast distribution

Question Imaging predictors of successful pain relief in lumbar spondylolysis patients with CLBP receiving bilateral pars injections are unknown. Findings Isthmic BME on MRI was a significant predictor of successful pain relief immediately and 1-month post-injection. CT-contrast distribution did not influence pain relief. Clinical relevance CT-guided pars injections offer successful pain relief in spondylolysis patients with CLBP. Isthmic BME on MRI is a significant predictor for successful pain relief, whereas CT-contrast distribution during injection is not.