To analyse if patients with pain improvement following a nerve root block had better outcomes following lumbar microdiscectomy.

Fifty-six patients who had a lumbar microdiscectomy were retrospectively followed up to 1 year. All patients had a selective nerve root block (SNRB) as a primary treatment or diagnostic procedure. VAS pain scores were measured daily for 1 week following injection. Patients were grouped into responders and non-responders at 1 week. The 2 groups of patients were followed at 1 year following a lumbar microdiscetomy (LMD).

A total of 118 patients had SNRB over a period of 3 years. Of the 56 patients studied retrospectively, 52% and 36% of patients had a VAS score improvement of more than 2 points at 4 days and 1 week respectively. At 1 year post op, 85% of patients had better outcomes in the responder group compared to 74% in the non responder group. Although there was a difference this was not statistically significant.

Improvement with SNRB is not a positive predictor of good response with surgery. The ability to evaluate the effect of diagnostic or therapeutic blocks on surgical outcomes is limited by a lack of randomized studies and wide-ranging discrepancies with regard to injection techniques, surgical technique, and outcome measures. More research is needed to determine if diagnostic screening blocks can improve surgical outcomes.

To analyse if patients with pain improvement following a nerve root block had better outcomes following lumbar microdiscectomy.

Fifty-six patients who had a lumbar microdiscectomy were retrospectively followed up to 1 year. All patients had a selective nerve root block (SNRB) as a primary treatment or diagnostic procedure. VAS pain scores were measured daily for 1 week following injection. Patients were grouped into responders and non-responders at 1 week. The 2 groups of patients were followed at 1 year following a lumbar microdiscetomy (LMD).

A total of 118 patients had SNRB over a period of 3 years. Of the 56 patients studied retrospectively, 52% and 36% of patients had a VAS score improvement of more than 2 points at 4 days and 1 week respectively. At 1 year post op, 85% of patients had better outcomes in the responder group compared to 74% in the non responder group. Although there was a difference this was not statistically significant.

Improvement with SNRB is not a positive predictor of good response with surgery. The ability to evaluate the effect of diagnostic or therapeutic blocks on surgical outcomes is limited by a lack of randomized studies and wide-ranging discrepancies with regard to injection techniques, surgical technique, and outcome measures. More research is needed to determine if diagnostic screening blocks can improve surgical outcomes.