Evidence map›Paper›PMID 41973157›Full record

ArticleRadiological physics and technology2026

Optimization of postoperative unicompartmental knee arthroplasty radiography using a phantom-based ray-summation positioning sheet.

Kenta Katano, Kentaro Sakata, Madoka Nanao, Makoto Kudo, Tomohiro Sato, Toshikazu Imae, Kousaku Saotome, Yuichi Suzuki, Toshihiro Hayashi, Osamu Abe

Abstract read
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In one paragraph

Article in Radiological physics and technology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing 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

0 citing papers in PubMed.

No citing paper in PubMed yet.

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.

Kenta KatanoRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. katanok-rad@h.u-tokyo.ac.jp.ORCID http://orcid.org/0009-0007-8265-0400
Kentaro SakataRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Madoka NanaoRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Makoto KudoRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Tomohiro SatoRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Toshikazu ImaeRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Kousaku SaotomeGraduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2 Ami, Inashiki-gun, Ami-machi, Ibaraki, 300-0394, Japan.
Yuichi SuzukiRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Toshihiro HayashiRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
Osamu AbeRadiology Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Achieving accurate positioning in postoperative unicompartmental knee arthroplasty (UKA) radiography is challenging, often necessitating increased exposure and examination time. We developed a positioning assistance sheet based on ray-summation images simulating rotation, flexion, and extension, and validated its efficacy in reducing exposure. We retrospectively analyzed 115 knees imaged between January 2024 and February 2025. A knee phantom was scanned to generate ray-summation images, which were used to design the assistance sheet. The mean number of exposures was compared before and after implementation, with a significant decrease from 3.26 to 2.37 (P = 0.03). The reduction was particularly pronounced among radiology technologists with < 5 years of experience. Furthermore, no significant differences were observed between left and right knees post-implementation (P = 0.30), confirming the sheet’s bilateral applicability. Consequently, the positioning assistance sheet significantly reduced the number of exposures required for postoperative UKA radiographs and proved effective regardless of technologist experience or laterality.

Indexed as

Arthroplasty, Replacement, KneePatient PositioningPhantoms, ImagingHumansRetrospective StudiesImplant alignment evaluationPositioning errorsRadiation exposure reductionRadiographyTechnologist experience

Identifiers

PMID41973157
PMCPMC13253594

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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.