Bed rest after incidental durotomy in lumbar surgery. A redundant measure in case of watertight dural repair.

Background Cerebrospinal fluid (CFS) leaks are a well-known complication in spinal surgery, caused mostly by incidental durotomy (ID). Management of ID is a matter of ongoing debate. Different treatment strategies have been described ranging from no specific treatment to intraoperative suture or even complex reconstructive procedures. The role of bedrest has also been controversially discussed. The aim of this study was thus to evaluate a potential benefit of post-operative bedrest after ID. Methods ID management following lumbar spine surgery at a high-volume center between 01/2014 and 12/2017 was retrospectively assessed. Several risk factors such as type of surgery, size of dural lesion, intraoperatively chosen strategy, post-operative management (e.g. bedrest) and surgery-related complications were analyzed. Failure of the chosen strategy was defined as symptomatic CSF leakage, requiring revision surgery. Results Sufficient data was available for 135 patients with intraoperatively detected incidental durotomy. Eighty-seven patients with intraoperatively detected ID (64.4%) were additionally managed with bedrest, whereas 48 patients (35.6%) were immediately mobilized after surgery. Sixteen patients overall needed to be revised. However, patients treated with additional bedrest did not show a significant reduction of CSF fistula rate (p=0.27). The degree of laceration (>5mm) negatively affected the outcome (p=0.027). The hospital stay was significantly prolonged in patients, who were subjected to additional bedrest (p=0.001). Conclusions Postoperative CSF leakage represents a serious postoperative complication of lumbar surgery. Intraoperative dural repair plays a crucial role to avoid further neurological morbidity. Postoperative bedrest might be spared in case of watertight dural closure.