Evaluation and management of small dural tears in primary lumbar spinal decompression and discectomy surgery.

Incidental dural tear is one of the most common intraoperative complications in lumbar spine surgery. Yet, its technical management for the prevention of CSF leak is controversial. The technique of managing dural tears depends on the location of the dural tears as well on the length and anatomical characteristics of the dural tear. We propose an anatomical classification for small (less than one cm) dural tears and report on the outcome of managing these dural tears types using different technique for different type. 62 patients underwent spinal dural repair after microdiscectomy or lumbar spinal decompression. Group 1 consisted of 20 patients, with Type I or mild dural tear who had tissue-glue coated collagen sponge or fibrin glue application. Group 2 comprised 21 patients with Type II or moderate dural tear who had both tissue-glue coated collagen sponge and fibrin glue application. Group 3 comprised 21 patients with Type III or severe dural tear who had polypropylene suture and tissue-glue coated collagen sponge and/or fibrin glue application. Evident postoperative CSF leak was used to determine the patient's postoperative result. Postoperative CSF leak was not evident during a minimum 1 year follow up in group 1. Internal CSF leak was evident in group 2 (n = 3) and group 3 (n = 3) during same follow up. Three patients underwent re-do spinal surgery for CSF leak repair. We recommend different management technique depending on the type of tear. For type I, we recommend the use of tissue-glue coated collagen sponge or fibrin glue application, without dural suturing.