Retrospective Evaluation Of Radiological And Clinical Postoperative Findings Of Patients Who Had Endoscopic Lumbar Discectomy.

Abstract

Aim: Minimally-invasive spinal surgery is increasingly being adopted worldwide. In this study, we evaluated the postoperative magnetic resonance imaging (MRI) findings and clinical outcomes of patients who underwent full endoscopic lumbar disk surgery.

Methods: Preoperative and postoperative 3rd and 6th month MRI features, visual analog scale (VAS) score, Oswestry Disability Index (ODI), and clinical features of patients who underwent percutaneous endoscopic lumbar discectomy between August 2009 and January 2012 were retrospectively analyzed.

Material and methods: Preoperative and postoperative 3rd and 6th month MRI features, visual analog scale (VAS) score, Oswestry Disability Index (ODI), and clinical features of patients who underwent percutaneous endoscopic lumbar discectomy between August 2009 and January 2012 were retrospectively analyzed.

Results: 65 patients (37 women, 28 men) were included in the study. VAS and ODI scores showed significant improvement postoperatively (p 0.001). Intervertebral disk height loss was observed only in two patients. In 31 (48%) out of the 64 levels treated, no significant anterior soft tissue mass developed. However, 33 patients (52%) showed anterior epidural edema and tissue formation postoperatively. Contrast enhancement of the nerve root was found in 20 levels (29.4%), nerve root edema in 3 levels (4.41%), and nerve root displacement in 3 levels (4.41%). None of the patients had all these 3 findings concomitantly. Of the 57 levels evaluated, 36 levels (63%) showed no or minimal changes in the posterior elements, and at the 3rd month, 9 levels (15.8%) demonstrated grade 1+ changes, 9 levels showed grade 2+ changes, and only 3 levels demonstrated grade 3+ changes; however, at 6-month follow-up, all vertebral levels showed improvements.

Conclusion: Endoscopic discectomy is a safe and effective minimally-invasive method. However, owing to the lack of definitive radiological criteria indicating success or failure, the radiological findings should always be interpreted in conjunction with.