Evidence map›Paper›PMID 39578924›Full record

ArticleKnee surgery & related research2024

Fractures in Oxford unicompartmental knee arthroplasty are associated with a decreased medial keel-cortex distance of the tibial implant.

Julius Watrinet, Daniel Berger, Philipp Blum, Matthias P Fabritius, Jörg Arnholdt, Rolf Schipp, Wolfgang Reng, Paul Reidler

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Article in Knee surgery & related research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.

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0cells of the map it votes in
6citing papers in PubMed
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1 · What the graph read from it

What it found

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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

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3 · Its place in the literature

Who cites it

6 citing papers in PubMed.

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4 · The record

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5 · Who and what money

Authors and funding

8 authors.

Julius WatrinetDepartment of Orthopaedic Sports Medicine, Technical University Munich, Germany, School of Medicine, Ismaninger Str. 22, 81675, Munich, Germany. julius.watrinet@mri.tum.de.ORCID http://orcid.org/0000-0003-0578-4142
Daniel BergerDepartment of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.
Philipp BlumDepartment Trauma Surgery, BG Unfallklinik Murnau, Professor-Küntscher-Straße 8, 82418, Murnau, Germany.
Matthias P FabritiusDepartment of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.
Jörg ArnholdtDepartment of Orthopedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.
Rolf SchippJoint Replacement Institute, Klinikum Garmisch-Partenkirchen, Endogap, Auenstraße 6, 82467, Garmisch-Partenkirchen, Germany.
Wolfgang Reng *Joint Replacement Institute, Klinikum Garmisch-Partenkirchen, Endogap, Auenstraße 6, 82467, Garmisch-Partenkirchen, Germany.
Paul Reidler *Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThis retrospective single-center study aimed to investigate incidence and risk factors influencing tibial periprosthetic fractures (TPF) in Oxford unicompartmental knee arthroplasty (UKA), with a specific focus on tibial component positioning and sizing.

methodsA total of 2063 patients with medial UKA using the Oxford® mobile partial knee implant were analyzed between July 2014 and September 2022. Various preoperative and postoperative radiographic parameters determining pre- and postoperative alignment and implant positioning, incidence and characteristics of periprosthetic fractures, and patient demographics were assessed. Statistical analyses, including Mann-Whitney U test and logistic regression, were conducted to identify significant associations and predictors of tibial fractures.

resultsOf the 1853 cases that were finally included in the study, 19 (1%) patients experienced TPF. The fracture group presented with a significantly shorter relative mediolateral and posteroanterior distance between the keel and cortex [mediolateral: 23.3% (23.2-24.8%) versus 27.1% (25.7-28.3%), p < 0.001; posteroanterior: 8.4% (6.3-10.3%) versus 10.0% (9.8-10.1%), p = 0.004]. Additionally, an increased posterior tibial slope in pre- and postoperative radiographs [preoperative: 10.4° (8.6-11.1°) versus 7.7° (5.4-10.0°), p < 0.001; postoperative 9.1° ± 3.1° versus 7.5° (5.9-9.0°), p = 0.030] was observed in the fracture group. Furthermore, the use of smaller-sized implants (AA) was associated with higher fracture rates (p < 0.001). Anatomical variants, such as a medial overhanging tibial plateau, were not observed.

conclusionsIn UKA, type Oxford TPF are linked to shorter mediolateral and posteroanterior keel-cortex distances, increased pre- and postoperative PTS, and small implant sizes (AA). Fracture lines often extend from the distal keel to the medial tibial cortex. These findings emphasize the importance of precise implant positioning and sizing to minimize fracture risk. Level of evidence Retrospective single-center study, III.

Indexed as

Component positioningOxford implantPeriprosthetic fractureRadiographic parametersTibial component sizingUnicompartmental knee arthroplasty

Identifiers

PMID39578924
PMCPMC11583789

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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.