Retrospective study. Objectives: To evaluate the effectiveness of microdiscectomy under local anesthesia in comparison with general anesthesia. Summary of Literature Review: No comparative studies regarding the outcomes of microdiscectomy under local and general anesthesia could be found in the literature. Materials and Methods: Between May 2000 and June 2004, 88 patients who underwent microdiscectomy under local anesthesia (n=50, local anesthesia group) or under general anesthesia (n=38, general anesthesia group) were selected and included in this study with a follow up period more than 3 years. The operation time and duration of hospital stay were documented. The Visual Analogue Scale (VAS) and the Oswestry Disability Index (ODI) were used to evaluate the degree of symptom relief. The patient satisfaction was evaluated using the MacNab's criteria and postoperative complications. Results: Between both groups there is no significant operation time difference. However, the average hospital stay duration in the general anesthesia group was 7.3 days, while it was 4.7 days in the local anesthesia group (P<0.05). The VAS and ODI scores were improved in both groups. Thirty-two cases (84.2%) of the general anesthesia group and 40 cases (80%) of the local anesthesia group showed satisfied results by the MacNab's criteria with no statistically significant difference (P>0.05). Three patients in the general anesthesia group and 7 patients in the local anesthesia group needed a reoperation. Conclusions: A microdiscectomy under local anesthesia shows faster recovery period. But it shows also a relative high revision rate. In patients with old age and underlying disease, local anesthesia can be used for the microdiscectomy selectively and careful exploration of the herniated disc is required.
