Evidence map›Paper›PMID 34917717›Full record

ArticleArthroplasty today2022

Kinematically Aligned Total Knee Arthroplasty Using Medial Pivot Knee Prosthesis Enhances Medial Pivot Motion: A Comparative Kinematic Study With Mechanically Aligned Total Knee Arthroplasty.

Kazuya Kaneda, Yasuo Niki, Yuji Kuroyanagi, Shu Kobayashi, Kengo Harato, Yu Iwama, Takeo Nagura

Open access · goldAbstract read
In one paragraph

Article in Arthroplasty today, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed, 2 pooled it
3.6field-weighted citation impact, top 6% 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

16 citing papers in PubMed, 2 syntheses or guidelines pooled it, 32 citations in OpenAlex.

  1. Pooled it
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  6. Medial pivot total knee arthroplasty.Journal of clinical orthopaedics and trauma · 2025
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  14. Asia-Pacific journal of sports medicine, arthroscopy, rehabilitation and technology · 2024
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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

7 authors at 2 institutions in 1 country.

Kazuya KanedaDepartment of Orthopaedic Surgery, School of Medicine, Keio University, Shinjuku, Tokyo, Japan.
Yasuo NikiDepartment of Orthopaedic Surgery, School of Medicine, Keio University, Shinjuku, Tokyo, Japan.
Yuji KuroyanagiDepartment of Orthopaedic Surgery, Eiju General Hospital, Taito, Tokyo, Japan.
Shu KobayashiDepartment of Orthopaedic Surgery, School of Medicine, Keio University, Shinjuku, Tokyo, Japan.
Kengo HaratoDepartment of Orthopaedic Surgery, School of Medicine, Keio University, Shinjuku, Tokyo, Japan.
Yu IwamaDepartment of Orthopaedic Surgery, School of Medicine, Keio University, Shinjuku, Tokyo, Japan.
Takeo NaguraDepartment of Clinical Biomechanics, School of Medicine, Keio University, Shinjuku, Tokyo, Japan.
Keio University · JPEiju General Hospital · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundClinical outcomes of kinematically aligned total knee arthroplasty (KA-TKA) have been reported as comparable or superior to those of mechanically aligned TKA (MA-TKA). However, cruciate-retaining prostheses have mostly been used for KA-TKA. This study used medial pivot knee prostheses for KA-TKA, and knee kinematics after KA-TKA were assessed and compared with those after MA-TKA.

methodsThirteen knees in 9 patients undergoing primary TKA (8 KAs, 5 MAs) were subjected to two-dimensional (2D) to three-dimensional (3D) registration analysis at 1 year postoperatively. Each patient performed weight-bearing activities, and movements were recorded as intermittent digital radiographic images. Three-dimensional implant positions during activities were analyzed for anterior-posterior translation in the sagittal plane, condylar liftoff and mediolateral translation in the coronal plane, and femoral rotation in the axial plane.

resultsPosterior translation of the lateral femoral condyle from 0° to 100° was larger in KA-TKA than in MA-TKA (

conclusionsKA-TKA using a medial pivot knee prosthesis successfully reproduced the medial pivot pattern and achieved larger femoral external rotation relative to the tibia than MA-TKA. KA-TKA was able to maximize the primary concept of the medial pivot knee prosthesis.

Indexed as

2D-3D registrationFluoroscopic analysisKinematically aligned total knee arthroplastyMedial pivot

Identifiers

PMID34917717
PMCPMC8666599
OpenAlexW4200589206

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.