Evidence map›Paper›PMID 34216235›Full record

ArticleEuropean spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society2021

Morphological analysis of Kambin's triangle using 3D CT/MRI fusion imaging of lumbar nerve root created automatically with artificial intelligence.

Katsuhisa Yamada, Ken Nagahama, Yuichiro Abe, Yoshinori Hyugaji, Masahiko Takahata, Norimasa Iwasaki

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Article in European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  4. Simulation-based anatomical feasibility of full-endoscopic transforaminal approach at the L5/S1 level using 3D-MRI/CT fusion imaging: influence of age, sex, and anatomical obstacles.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
    Article
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  6. UBE-TFD for lumbar foraminal stenosis and extreme lateral disc herniation: a preliminary case series of Doom's Point vs. pars interarticularis localization.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
    Article
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  8. Feasibility and accuracy of AI-assisted 3D MRI/CT fusion imaging for preoperative simulation of full-endoscopic transforaminal discectomy.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
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  16. Posterolateral full-endoscopic debridement and irrigation is effective in treating thoraco-lumbar pyogenic spondylodiscitis, except in cases with large abscess cavities.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2023
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Katsuhisa YamadaDepartment of Orthopaedic Surgery, Hokkaido University Hospital, North-14, West-5, Kita-ku, Sapporo, Hokkaido, 060-8648, Japan. yka2q@yahoo.co.jp.ORCID 0000-0002-9841-5890
Ken NagahamaDepartment of Orthopaedic Surgery, Sapporo Endoscopic Spine Surgery Clinic, North-16, East-16, Higashi-ku, Sapporo, Hokkaido, 065-0016, Japan.
Yuichiro AbeDepartment of Orthopaedic Surgery, Wajokai Eniwa Hospital, Koganemachi 2-1, Eniwa, Hokkaido, 061-1449, Japan.
Yoshinori HyugajiDepartment of Orthopaedic Surgery, Sapporo Endoscopic Spine Surgery Clinic, North-16, East-16, Higashi-ku, Sapporo, Hokkaido, 065-0016, Japan.
Masahiko TakahataDepartment of Orthopaedic Surgery, Hokkaido University Hospital, North-14, West-5, Kita-ku, Sapporo, Hokkaido, 060-8648, Japan.
Norimasa IwasakiDepartment of Orthopaedic Surgery, Hokkaido University Hospital, North-14, West-5, Kita-ku, Sapporo, Hokkaido, 060-8648, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeWe developed a software program that automatically extracts a three-dimensional (3D) lumbar nerve root image from magnetic resonance imaging (MRI) lumbar nerve volume data using artificial intelligence. The aim of this study is to evaluate the morphology of Kambin's triangle in three dimensions based on an actual endoscopic transforaminal surgical approach using three-dimensional (3D) computed tomography (CT)/ magnetic resonance imaging (MRI) fusion images of the lumbar spine and nerve tissue.

methodsThree-dimensional lumbar spine/nerve images of 100 patients (31 males and 69 females; mean age, 66.8 years) were used to evaluate the relationship between the superior articular process (SAP), exiting nerve root (ENR), and dural canal at the L2/3, L3/4, and L4/5 levels at 45° and 60° approach angles.

resultsThe SAP-ENR distance at 60° was the greatest at L4/5 and was significantly greater at L2/3 and L4/5 than at L3/4 (P < 0.01, P < 0.01, respectively). The SAP-ENR distance at 45° was the greatest at L2/3, and it was larger in L2/3 and L4/5 than in L3/4 (P < 0.01, P < 0.01, respectively). The SAP-ENR distances at L4/5 were significantly greater at 60° than at 45° (P < 0.01). The dural canal was located within Kambin's triangle on the plane of the upper endplate of the lower vertebra at L2/3 in 41.5% of the cases and at L3/4 in 14% of the cases at 60° but not at L4/5.

conclusionThe 3D lumbar spine/nerve image enabled a combined assessment of the positional relationship between the SAP, ENR, and dural canal to quantify the safety zone of practical endoscopic spinal surgery using a transforaminal approach. Three-dimensional lumbar spine/nerve images could be useful for examining parameters, including bones and nerves, to ensure the safety of surgery.

Indexed as

Artificial IntelligenceSpinal Nerve RootsAgedFemaleHumansLumbar VertebraeMagnetic Resonance ImagingMaleTomography, X-Ray ComputedArtificial intelligenceEndoscopic spinal surgeryKambin’s triangleLumbar spineWorking zone

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.