Study design: Report of seven patients with ®brous adhesive entrapment of lumbosacral nerve roots as a cause of sciatica, whose radiographic ®ndings were negative and who experienced relief from sciatica immediately after the entrapment was released. Objectives: To describe a new clinical entity of ®brous adhesive entrapment of lumbosacral nerve roots with negative radiographic ®ndings. Setting: Orthopaedic department, Japan. Methods: Clinical evaluation and post-operative outcome in seven patients with entrapment of lumbosacral nerve roots because of ®brous adhesion con®rmed intraoperatively. Results: Radiographic examinations by magnetic resonance imaging (MRI), myelography, and computed tomographic (CT) myelography demonstrated neither disc herniations nor spinal stenosis in all seven patients, and di erential nerve root block was e ective for relieving sciatica and low back pain. We con®rmed, intraoperatively, entrapment of the nerve root by ®brous adhesion, and all seven patients were relieved from sciatica and low back pain postoperatively. Conclusion: This study presented seven patients with sciatica caused by ®brous adhesive entrapment of lumbosacral nerve roots who underwent decompression and release of ®brous adhesion. Radiographic examinations, such as MRI, myelography and CT myelography, showed no compressive shadows and also di erential nerve root block was e ective for its diagnosis. This study seems to be the ®rst report of patients with entrapment of lumbosacral nerve roots caused by ®brous adhesion, whose radiographic ®ndings were negative. Spinal Cord (2001) 39, 269 ± 273

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