Revision Endoscopic Surgery

When a spine has been operated on before, the tissues heal with scar. At a second open operation, that scar has to be dissected to reach the target, which takes time, can be bloody, and risks injuring the nerves that are now tethered within it. This is one of the reasons second operations have historically carried more risk and less predictable results than first-time surgery. Any technique that lets the surgeon reach the problem while cutting through less scar and disturbing less normal tissue is therefore attractive in the revision setting.

Full-endoscopic surgery works through a portal only a few millimetres wide, with continuous saline irrigation and direct magnified vision. In a revision, this can allow the surgeon to approach a recurrent disc herniation or a residual area of compression along a corridor that partly avoids the old scar — for example through the foramen from the side, rather than back through the previous midline approach. Less tissue is stripped, blood loss tends to be low, and the previous instrumentation or fusion can often be left undisturbed. For the right problem in the right patient, this is a genuinely elegant solution.

Endoscopic revision can be considered for several situations after previous spinal surgery, including a recurrent disc herniation at a previously operated level, residual or recurrent nerve-root compression, and certain problems adjacent to a previous fusion. It is not suitable for every revision — some situations genuinely need a larger reconstruction or a fusion — but where the target is a focal area of compression, an endoscopic approach can address it with minimal additional disruption. The suitability of an endoscopic revision is assessed carefully on the imaging and the clinical picture.

The evidence supports endoscopic revision as an effective option in selected cases. Comparative studies, including randomised work, have found full-endoscopic revision for recurrent disc herniation to give results comparable to conventional microsurgical revision, with the advantages of a smaller approach. Series of revisional full-endoscopic surgery, and of endoscopic surgery after previous fusion, report good relief of leg pain with low complication rates in appropriately selected patients. This evidence base, in an area his practice focuses on, underpins the role of endoscopic techniques in revision.

Whether an endoscopic revision is suitable depends on the exact problem, the previous surgery and the imaging. Where it is appropriate, it offers a way to address the recurrent problem through a keyhole with minimal further disruption; where it is not, a more conventional revision or reconstruction is the safer choice, and this is discussed honestly. The plan, the realistic expectations and the alternatives are set out individually before any decision.

• —Ruetten S, et al. Recurrent lumbar disc herniation: full-endoscopic versus microsurgical revision. J Neurosurg Spine 2009. (PMID 19342934)
• —Hoogland T, et al. Revisional percutaneous full-endoscopic disc surgery for recurrent herniation after open discectomy. Pain Physician 2011. (PMID 21386940)
• —Yao Y, et al. Percutaneous endoscopic lumbar discectomy for recurrent lumbar disc herniation: systematic review and meta-analysis. 2025. (PMID 40242820)
• —Kim HS, et al. Transforaminal endoscopic discectomy and foraminoplasty after lumbar fusion surgery. Pain Physician 2017. (PMID 28727709)
• —Shin SH, et al. Minimally invasive TLIF versus endoscopic discectomy for recurrent herniation after microendoscopic discectomy. World Neurosurg 2017. (PMID 27919762)