Evidence map›Paper›PMID 34215921›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

Evaluation of cage subsidence in standalone lateral lumbar interbody fusion: novel 3D-printed titanium versus polyetheretherketone (PEEK) cage.

Dominik Adl Amini, Ichiro Okano, Lisa Oezel, Jiaqi Zhu, Erika Chiapparelli, Jennifer Shue, Andrew A Sama, Frank P Cammisa, Federico P Girardi, Alexander P Hughes

Abstract read
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In one paragraph

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 31 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
31citing papers in PubMed, 2 pooled it
6.1field-weighted citation impact, top 3% of its field
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

31 citing papers in PubMed, 2 syntheses or guidelines pooled it, 54 citations in OpenAlex.

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  4. [Application of three-dimensional printed porous titanium alloy cage and poly-ether-ether-ketone cage in posterior lumbar interbody fusion].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2022
    Trial
  5. Comparison between large interbody cage versus two smaller interbody cages in unilateral biportal endoscopic transforaminal interbody fusion.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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  10. Applications of 3D printing in orthopedics: a scoping review.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2025
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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

10 authors at 1 institution in 2 countries.

Dominik Adl AminiSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Ichiro OkanoSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Lisa OezelSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Jiaqi ZhuSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Erika ChiapparelliSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Jennifer ShueSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Andrew A SamaSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Frank P CammisaSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Federico P GirardiSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA.
Alexander P HughesSpine Care Institute, Hospital for Special Surgery, 535 East 70th Street, New York, NY, 10021, USA. hughesa@hss.edu.ORCID 0000-0001-7293-9672
Hospital for Special Surgery · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThis study aims to compare the early subsidence rate (6-12 months) of standalone novel 3D-printed titanium (Ti) versus polyetheretherketone (PEEK) interbody cages after lateral lumbar interbody fusion (LLIF).

methodA retrospective study of 113 patients (186 levels) who underwent LLIF surgery with Ti or PEEK cages was conducted. Early subsidence was measured in each treated level using the Marchi et al. classification in radiographs or CT scans acquired at 6-12 months follow-up. Multivariate logistic regression analyses with generalized mixed models, setting subsidence as the outcome variable and including cage type (Ti vs PEEK) as well as significant and trending variables (p < 0.10) in univariate analyses, were conducted.

resultsIn total, 51 female and 62 male patients were analyzed. The median [IQR] age at surgery was 60.0 [51.0-70.0] years. Of the 186 levels, 119 levels were treated using PEEK and 67 levels with Ti cages. The overall subsidence rate for Grades I-III was significantly less in the Ti versus the PEEK group (p = 0.003). For high-grade subsidence (Grade II or III), Ti cages also demonstrated a subsidence rate (3.0%) that was significantly less compared to PEEK cages (18.5%) (p = 0.002). Multivariate analysis showed that patients treated with Ti cages were less likely to develop severe subsidence compared to those treated with PEEK (OR = 0.05, 95% CI = 0.01, 0.30) (p = 0.001).

conclusionOur study demonstrated that 3D-printed novel Ti cages had a significantly lower early subsidence rate compared to PEEK cages in standalone LLIF patients.

Indexed as

Spinal FusionTitaniumBenzophenonesFemaleHumansKetonesLumbar VertebraeMalePolyethylene GlycolsPolymersPrinting, Three-DimensionalRetrospective StudiesBenzophenonesKetonespolyetheretherketonePolyethylene GlycolsPolymersTitaniumCage subsidenceLLIFLumbar fusionPEEKStandaloneTitanium

Identifiers

PMID34215921
OpenAlexW3176443883

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.