Evidence map›Paper›PMID 41917140›Full record

ArticleScientific reports2026

Incidence and prognostic factors of postoperative C5 palsy after cervical OPLL surgery: a nationwide prospective multicenter study.

Satoru Egawa, Takashi Hirai, Kenichiro Sakai, Kazuo Kusano, Shunji Tsutsui, Yu Matsukura, Kentaro Yamada, Hiroaki Onuma, Kanichiro Wada, Keiichi Katsumi and 33 more

Abstract readMulticenter Study
PubMed Full text at PMC Publisher
In one paragraph

Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–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

1 citing paper in PubMed.

  1. Article
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

43 authors.

Satoru EgawaDepartment of Orthopedic Surgery, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8519, Japan.
Takashi HiraiDepartment of Orthopedic Surgery, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8519, Japan. hirai.orth@tmd.ac.jp.
Kenichiro SakaiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Kazuo KusanoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Shunji TsutsuiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Yu MatsukuraDepartment of Orthopedic Surgery, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8519, Japan.
Kentaro YamadaDepartment of Orthopedic Surgery, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8519, Japan.
Hiroaki OnumaDepartment of Orthopedic Surgery, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8519, Japan.
Kanichiro WadaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Keiichi KatsumiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Masao KodaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Atsushi KimuraJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Takeo FuruyaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Satoshi MakiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Norihiro NishidaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Yukitaka NagamotoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Yasushi OshimaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Kei AndoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Hiroaki NakashimaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Tsutomu EndoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Kanji MoriJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Hideaki NakajimaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Kazuma MurataJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Masayuki MiyagiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Takashi KaitoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Kei YamadaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Tomohiro BannoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Satoshi KatoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Tetsuro OhbaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Masahiko TakahataJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Hiroshi MoridairaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Shunsuke FujibayashiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Hiroyuki KatohJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Haruo KannoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Narihito NagoshiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Hiroshi TaneichiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Shiro ImagamaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Yoshiharu KawaguchiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Katsushi TakeshitaJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Masaya NakamuraJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Morio MatsumotoJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Masashi YamazakiJapanese Multicenter Research Organization for Ossification of the Spinal Ligament, Tokyo, Japan.
Toshitaka YoshiiDepartment of Orthopedic Surgery, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo Ward, Tokyo, 113-8519, Japan.

Funding

Japan Agency for Medical Research and Development 23ek0109541h0003
6 · The paper itself

Abstract

This prospective multicenter study examined the incidence, risk factors, and recovery course of C5 palsy after surgery for cervical ossification of the posterior longitudinal ligament in 482 patients treated at 28 institutions between 2015 and 2017. C5 palsy was defined as a postoperative decline of at least one grade in deltoid MMT strength. Overall, 6.0% of patients developed C5 palsy, with notable variation by surgical procedure: 4.0% after anterior decompression and fusion, 4.6% after laminoplasty, and 11.8% after posterior decompression and fusion. Nearly half of the affected patients developed symptoms on the day of surgery, and deltoid strength dropped from a mean of 4.7 preoperatively to 2.3 at onset. Over the following two years, 81% of patients regained their preoperative motor function. Better outcomes were observed in younger individuals and in those without concurrent biceps brachii weakness, whereas older patients and those with multimuscle involvement showed less favorable recovery. These findings clarify the expected clinical course of C5 palsy after OPLL surgery and highlight patient factors that may help guide prognosis and perioperative counseling.

Indexed as

Cervical VertebraeDecompression, SurgicalOssification of Posterior Longitudinal LigamentParalysisPostoperative ComplicationsAdultAgedFemaleHumansIncidenceLaminoplastyMaleMiddle AgedPrognosisProspective StudiesRisk FactorsC5 palsyCervical ossification of the posterior longitudinal ligamentNationwide prospective studyOPLLPrognosis

Identifiers

PMID41917140
PMCPMC13187153

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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.