Evidence map›Paper›PMID 30997038›Full record

ArticleBone & joint research2019

Effect of tibial component alignment on knee kinematics and ligament tension in medial unicompartmental knee arthroplasty.

K Sekiguchi, S Nakamura, S Kuriyama, K Nishitani, H Ito, Y Tanaka, M Watanabe, S Matsuda

Open access · goldAbstract read
In one paragraph

Article in Bone & joint research, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers.

0numbers the graph read from it
0cells of the map it votes in
39citing papers in PubMed
8.4field-weighted citation impact, top 2% 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

39 citing papers in PubMed, 71 citations in OpenAlex.

  1. Visual inspection provides precise intraoperative evaluation of tibial slope during unicompartmental knee arthroplasty.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026
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  10. [Biomechanical effects of medial and lateral translation deviations of femoral components in unicompartmental knee arthroplasty on tibial prosthesis fixation].Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi · 2025
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  12. [Biomechanical study of knee joint based on coronal plane alignment of the knee].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2024
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  14. What effect does preoperative flexion contracture have on the component angles in unicompartmental knee arthroplasty?European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 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

8 authors at 2 institutions in 1 country.

K SekiguchiDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan; Medical Staff, Yawata Central Hospital, Yawata, Japan.
S NakamuraDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
S KuriyamaDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
K NishitaniDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
H ItoDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
Y TanakaDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
M WatanabeDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
S MatsudaDepartment of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan.
Kyoto University · JPYawata Medical Center · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesUnicompartmental knee arthroplasty (UKA) is one surgical option for treating symptomatic medial osteoarthritis. Clinical studies have shown the functional benefits of UKA; however, the optimal alignment of the tibial component is still debated. The purpose of this study was to evaluate the effects of tibial coronal and sagittal plane alignment in UKA on knee kinematics and cruciate ligament tension, using a musculoskeletal computer simulation.

methodsThe tibial component was first aligned perpendicular to the mechanical axis of the tibia, with a 7° posterior slope (basic model). Subsequently, coronal and sagittal plane alignments were changed in a simulation programme. Kinematics and cruciate ligament tensions were simulated during weight-bearing deep knee bend and gait motions. Translation was defined as the distance between the most medial and the most lateral femoral positions throughout the cycle.

resultsThe femur was positioned more medially relative to the tibia, with increasing varus alignment of the tibial component. Medial/lateral (ML) translation was smallest in the 2° varus model. A greater posterior slope posteriorized the medial condyle and increased anterior cruciate ligament (ACL) tension. ML translation was increased in the > 7° posterior slope model and the 0° model.

conclusionThe current study suggests that the preferred tibial component alignment is between neutral and 2° varus in the coronal plane, and between 3° and 7° posterior slope in the sagittal plane. Varus > 4° or valgus alignment and excessive posterior slope caused excessive ML translation, which could be related to feelings of instability and could potentially have negative effects on clinical outcomes and implant durability.

Indexed as

AlignmentComputer simulationKinematicsKineticsUnicompartmental knee arthroplasty

Identifiers

PMID30997038
PMCPMC6444020
OpenAlexW2924721558

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.