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Objective To assess the predictive value of immediate pain-relief after CT-guided transforaminal epidural steroid injection (TFESI) including local anesthetics for longer-term pain relief and patients’ global impression of change (PGIC) after 4 weeks. Materials and methods One hundred ninety-three patients (age 55.4 ± 14.9) with single-level discogenic lumbar radiculopathy and subsequent TFESI were included. Pain scores were recorded before (NRS 0 ), 15 min (NRS 15min ), and 4 weeks (NRS 4w ) after treatment using a numerical-rating-scale (NRS; 0, no pain; 10, intolerable pain). Additionally, the PGIC was assessed after 4 weeks. Two fellowship-trained musculoskeletal radiologists evaluated nerve compression of the injected level and contrast dispersion. Spearman’s rank and point-biserial correlation were applied to assess associations between outcome variables and demographics/imaging findings. A  p -value &lt; 0.05 was considered to be statistically significant. Results There was a significant positive correlation between immediate pain-relief and longer-term pain-reduction ( r  = 0.24,  p  = 0.001) with an odds ratio of 2.0 ( CI : 1.1–3.6). A good short-term response (NRS 15min  ≥ 50% reduction) was associated with a persistent longer-term good response (NRS 4w  ≥ 50% reduction) in 59.7% ( CI : 50.9–68.0%) of patients. There was no association between short-term pain-relief and PGIC after 4 weeks ( p  = 0.18). Extent and location of nerve compression and contrast dispersion during TFESI did not correlate with longer-term pain-relief (all  p  ≥ 0.07). Conclusion Our results indicate a significant positive correlation between immediate post-procedural and longer-term pain relief after TFESI in patients with lumbar radiculopathy; however, no effect of short-term pain relief is seen on PGIC after 4 weeks. Patients with good longer-term outcome (≥ 50% pain reduction) are twice as likely to have already shown good immediate pain reduction after TFESI.

skeletal radiology

Predictive value of immediate pain relief after lumbar transforaminal epidural injection with local anesthetics and steroids for single level radiculopathy