Effects of transcutaneous electrical nerve stimulation in the Management of Post-Injection Sciatic Pain in a non-randomized controlled clinical trial in Nnewi, Nigeria

A total of 72 PISP subjects comprising 40 test subjects and 32 control subjects participated in a non-randomized controlled clinical trial in the current study. Participants were recruited from Department of Physiotherapy, Nnamdi Azikiwe University Teaching Hospital, Nnewi and Landmark Physiotherapy Services, Nnewi. The participants were however blinded to the intervention method they will receive before being allotted conveniently to test/experimental group (TG) or control group (CG). A written informed consent was obtained from participants before enrollments in the study. TENS and sham TENS (STENS) was applied to 40 test and 32 subjects respectively, 3 times a week, and 1 hour per session for the 10 weeks the study lasted. The Visual Analogue Scale was used to collect baseline data as well as those of 2nd, 4th, 6th, 8th and 10th weeks after TENS and STENS interventions. The data analysis was performed with the Descriptive statistic of Mean ± SD, mean comparison test, repeated analysis of variance and paired wise t-test. Statistical level of significance was set at P < 0.05.

Results of repeated measure ANOVA showed that the pain level among participants in the treatment group at the end (after 10 weeks) of the intervention was significantly lower than that of their counterparts in the control group (F = 16.26; p = 0.01); with the intervention accounting for the 19% of the variance. The effect size (partial eta squared) = 0.19.