Six-month window dominates decade of sciatic nerve injury research

Traumatic sciatic nerve injuries can leave patients with foot drop, impaired plantar flexion and numbness below the knee, yet no single hospital sees enough cases to draw firm conclusions about how injury mechanism or surgical timing shapes recovery. A new bibliometric analysis has now mapped the entire scientific output on the topic over an eleven-year span, and its most striking message is about the clock: among patients who achieved good motor recovery, defined as a Medical Research Council grade of three or above, the proportion was 72 percent when surgery was performed within six months of injury, falling to 61 percent between seven and twelve months and to zero beyond twelve months, regardless of which repair technique surgeons used. The analysis, published in the Egyptian Journal of Neurosurgery, is the first to examine this literature specifically through the lens of trauma mechanism, operative decision-making and functional recovery.

Researchers searched Web of Science, Scopus and PubMed/MEDLINE for English-language original articles and reviews published between January 2015 and December 2025, using predefined Boolean search strings and a PRISMA 2020-compliant selection process. From an initial pool of 894 records, 612 unique publications remained after deduplication, 489 underwent full-text assessment, and 416 met the inclusion criteria. Performance analysis and science mapping were carried out in Biblioshiny, the bibliometrix R package, and in VOSviewer, while correlational statistics ran in IBM SPSS Statistics version 27. The resulting dataset comprised 349 original articles, or 83.9 percent of the total, and 57 reviews, or 13.7 percent.

Annual output proved remarkably stable rather than growing: it ranged from 32 publications in 2017 and 2018 to a peak of 42 in 2019, 2020 and 2022, with a modest step-up from 2019 onwards that coincided with increased reporting from combat-related injury cohorts and the emergence of acellular nerve allograft series in the surgical literature. The 416 papers were scattered across 288 journals, with Cureus: Journal of Medical Science and the International Journal of Molecular Sciences contributing the most, seven papers each, or 1.7 percent of output, followed by BMC Musculoskeletal Disorders, Neural Regeneration Research and the Journal of Orthopaedic Trauma with six each. No single journal accounted for more than 1.7 percent of the total, a fragmentation the authors say reflects the interdisciplinary nature of a field spanning neurosurgery, orthopedic surgery, plastic and reconstructive surgery, rehabilitation medicine and basic neuroscience, and one that may contribute to the absence of a unified methodological culture in outcome reporting.

Geographically, Germany led with 28 papers, or 6.7 percent, followed by Turkey with 25, or 6.0 percent, India with 22, or 5.3 percent, Iran with 21, or 5.0 percent, and Brazil with 20, or 4.8 percent. Italy, the United Kingdom, Japan, Canada and Australia completed the top ten. The authors note that this distribution reflects the global burden of the injury across high-, middle- and low-income settings, with no single region dominating. Citation count correlated significantly with the number of authors, Kendall’s tau of 0.19 with a p value of 0.004, and with the number of institutional affiliations, tau of 0.23 with p below 0.001, patterns consistent with comparable neurosurgical bibliometric studies. Across all 416 publications the total citation count reached 6,336, a mean of 15.2 citations per paper and a maximum of 278 for a single publication.

The mechanism data come from the 312 publications, or 75.0 percent of the total, that specified an injury etiology on full-text review. Blunt mechanisms represented the majority of specified cases at 54.9 percent, with motor vehicle accidents the most common at 89 papers, or 28.4 percent, followed by hip fracture-dislocation at 60 papers, or 19.3 percent. Penetrating injuries collectively accounted for 37.3 percent, led by gunshot wounds at 71 papers, or 22.6 percent, and stab or sharp implement injuries at 46 papers, or 14.7 percent. Injection injuries accounted for 26 papers, or 8.2 percent, and mixed or unclassified mechanisms for 21 papers, or 6.8 percent. The persistence of gunshot wounds as the leading penetrating etiology, the authors write, is consistent with the landmark surgical series of Kim and Kline, who identified firearm injuries as a dominant cause across 353 surgically treated sciatic nerve lesions, and the pattern has not shifted appreciably over the recent decade.

Surgical technique data were available from 198 publications, or 47.6 percent of the total. Neurolysis was the most frequently described procedure, documented in 64 percent of surgically treated cases, or 127 of 198. Sural nerve autografting was used in 32 percent, or 63 cases, and primary end-to-end neurorrhaphy in just 4 percent, or 8 cases, a figure the authors attribute to the narrow anatomical prerequisites for tension-free coaptation. Intraoperative nerve action potential recording appeared in 43 publications, and acellular cadaveric nerve allografts featured in 22 publications from 2018 onwards. Keyword burst analysis confirmed that Schwann cell transplantation and nerve conduit research showed the highest burst intensities between 2017 and 2021, while surgical timing and acellular nerve allograft demonstrated the strongest emerging burst activity from 2022 to 2025.

The six-month threshold, the authors argue, translates directly into referral practice. A patient presenting three months after a blunt sciatic nerve injury with no clinical recovery and no electrophysiological improvement should be referred promptly to a peripheral nerve surgeon rather than observed for another six months. The neurobiological basis is well established: prolonged denervation leads to progressive loss of motor endplate integrity, irreversible muscle fibrosis and Schwann cell depletion in the distal nerve stump, changes that render late repair functionally meaningless regardless of technical quality. The sciatic nerve’s anatomy compounds the challenge, since its long course from the lumbosacral plexus through the gluteal region and posterior thigh means high-level injuries must span considerable regenerative distances before reinnervation, and its dual tibial and common peroneal divisions within a shared epineurium mean fascicular injury patterns are rarely uniform, making intraoperative electrophysiology essential rather than optional.

Outcome reporting emerged as the field’s most glaring weakness. The MRC scale was used in 61 percent of outcome publications and the LSUMC grading system in 22 percent, with institution-specific tools accounting for the remainder. Not a single publication within the study period employed a validated patient-reported outcome measure as its primary assessment instrument. The authors argue this is not merely a methodological inconvenience but a genuine failure to agree on what a successful repair looks like, since the MRC scale does not capture a patient’s ability to walk independently, their neuropathic pain burden or their return to work. Tibial division injuries, they note, recovered more reliably than common peroneal injuries, and the surgical outcome figures they synthesize are descriptive pooled estimates drawn from cited narrative and systematic reviews rather than a formal meta-analysis.

Imaging also fared poorly in the analysis. Ultrasound and MRI together accounted for fewer than 8 percent of publications as a primary study focus, a proportion the authors call uncomfortably low given the diagnostic weight these modalities carry in preoperative workup. Ultrasound offers a particular advantage in penetrating injuries, because retained metallic fragments common in gunshot wounds degrade MRI quality at the exact site where imaging is most needed, while high-resolution ultrasound permits real-time assessment of nerve continuity, neuroma morphology and perineural scarring. MRI neurography addresses the opposite problem: for proximal gluteal-level injuries where ultrasound access is anatomically limited, it delineates the extent of fascicular damage and identifies early denervation signal changes in the posterior thigh musculature before atrophy becomes clinically apparent.

The authors recommend multicenter registries incorporating validated patient-reported outcome instruments and prospective comparison of penetrating versus blunt injury cohorts as the most actionable priorities for the field. They acknowledge limitations, including restriction to three English-language databases that will have missed relevant regional or non-English publications, country extraction from affiliation metadata that may underrepresent some high-output countries, and the inherent inability of bibliometric methods to assess the methodological quality of individual studies. Early evidence from combat-related series suggests processed cadaveric allografts can provide viable scaffolding for axonal regeneration without the donor-site morbidity of sural nerve harvest, but whether this translates into equivalent functional recovery at two to three years, the time horizon that matters most for sciatic nerve injuries, remains unanswered, and the burst intensity of allograft-related keywords from 2022 onward suggests higher-quality comparative data should emerge within the next few years.

Subject of Research: Bibliometric analysis of traumatic sciatic nerve injury research, injury mechanisms, surgical techniques and functional outcomes

Article Title: Traumatic sciatic nerve injuries: a bibliometric analysis of the last decade (2015–2025) penetrating and blunt mechanisms, surgical indications, and functional outcomes

Article References: Ozdemir, A., & Katar, S. (2026). Traumatic sciatic nerve injuries: a bibliometric analysis of the last decade (2015–2025) penetrating and blunt mechanisms, surgical indications, and functional outcomes. Egyptian Journal of Neurosurgery, 41(1), Article 162. https://doi.org/10.1186/s41984-026-00670-3

Image Credits: AI Generated

DOI: 10.1186/s41984-026-00670-3

Keywords: sciatic nerve injury, bibliometric analysis, peripheral nerve surgery, surgical timing, gunshot wounds, motor vehicle accidents, neurolysis, nerve autografting, acellular nerve allograft, MRC grading, patient-reported outcomes, foot drop