Evidence map›Paper›PMID 41483131›Full record

ArticleInternational orthopaedics2026

Timing of first-time dislocation varied by head size after total hip arthroplasty for nontraumatic osteonecrosis.

Seneki Kobayashi, Nobuhiko Sugano, Wataru Ando, Wakaba Fukushima, Kyoko Kondo, Takashi Sakai, Subcommittee Monitoring Replacement Arthroplasties

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Article in International orthopaedics, 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

7 authors.

Seneki KobayashiThe Investigation Committee on Osteonecrosis of the Femoral Head under the Ministry of Health, Labour and Welfare of Japan, Tokyo, Japan. seneki@suwa.jrc.or.jp.
Nobuhiko SuganoThe Investigation Committee on Osteonecrosis of the Femoral Head under the Ministry of Health, Labour and Welfare of Japan, Tokyo, Japan.
Wataru AndoThe Investigation Committee on Osteonecrosis of the Femoral Head under the Ministry of Health, Labour and Welfare of Japan, Tokyo, Japan.
Wakaba FukushimaThe Investigation Committee on Osteonecrosis of the Femoral Head under the Ministry of Health, Labour and Welfare of Japan, Tokyo, Japan.
Kyoko KondoOMU Core Facilities Life Sciences Section, Osaka Metropolitan University Graduate School of Medicine, Osaka-city, Japan.
Takashi SakaiThe Investigation Committee on Osteonecrosis of the Femoral Head under the Ministry of Health, Labour and Welfare of Japan, Tokyo, Japan.
Subcommittee Monitoring Replacement Arthroplasties

Funding

the Ministry of Health Labour and Welfare, Japan JPMH23FC1045
6 · The paper itself

Abstract

purposeThe cumulative probability of a first-time dislocation (CPD) after total hip arthroplasties (THAs) with a 22-mm head was reported in 2004 to rise steadily to 7% at 25 years. Later reports employing larger heads indicated that dislocations were concentrated in shorter periods after THA. Therefore, dislocations may occur differently over time depending on head sizes, which has not been clearly demonstrated. The purpose was to examine this hypothesis.

methodsWith first-time dislocation as the endpoint, the Cox proportional-hazards regression model and the Kaplan-Meier analyses were applied to 6,339 THAs performed for nontraumatic osteonecrosis of the femoral head, considering all possible influencing variables. Follow-up was 6.5 years on average (range, 0 to 27).

resultsFirst-time dislocations occurred in 289 THAs (4.6%) at a mean of 2.9 years (range, 0 to 19) following THA, with head sizes of 22, 26, 28, 32, and ≧ 36 mm in 33, 76, 86, 58, and 36 THAs, respectively (dislocation rate: 13.5, 8.2, 5.7, 2.5, and 2.7%, respectively; p < 0.001 in χ2 test). CPD increased linearly after THA in the 22-mm group, while larger-head groups showed a steep early rise followed by a decline.

conclusionFirst-time dislocations occurred differently over time with different head sizes.

Indexed as

Arthroplasty, Replacement, HipFemur HeadFemur Head NecrosisHip DislocationHip ProsthesisAdultAgedAged, 80 and overFemaleFollow-Up StudiesHumansKaplan-Meier EstimateMaleMiddle AgedProportional Hazards ModelsProsthesis DesignCox proportional-hazards regression modelKaplan–Meier analysisNontraumatic osteonecrosis of the femoral head (ONFH)Postoperative dislocationSurvival analysisTotal hip arthroplasty

Identifiers

PMID41483131

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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.