Evidence map›Paper›PMID 41995754›Full record

ArticleArchives of orthopaedic and trauma surgery2026

Time-zero stability of uncemented standard versus intermediate revision stems after extended trochanteric osteotomy (ETO): a biomechanical study.

Jakob Hax, Ivan Zderic, Boyko Gueorguiev, Yannik Kalbas, Michael Leunig, Hans-Christoph Pape, Hannes A Rüdiger

Abstract readComparative Study
In one paragraph

Article in Archives of orthopaedic and trauma surgery, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

What it found

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

7 authors.

Jakob HaxDepartment of Hip and Knee Surgery, Schulthess-Klinik, Zurich, Switzerland. jakob.hax@kws.ch.
Ivan ZdericAO Foundation, Davos, Switzerland.
Boyko GueorguievAO Foundation, Davos, Switzerland.
Yannik KalbasDepartment of Traumatology, University Hospital of Zurich, Zurich, Switzerland.
Michael LeunigDepartment of Hip and Knee Surgery, Schulthess-Klinik, Zurich, Switzerland.
Hans-Christoph PapeDepartment of Traumatology, University Hospital of Zurich, Zurich, Switzerland.
Hannes A RüdigerDepartment of Hip and Knee Surgery, Schulthess-Klinik, Zurich, Switzerland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionThis time-zero biomechanical study investigates femoral stem stability after extended trochanteric osteotomy (ETO) without fragment refixation, representing a worst-case scenario. ETO is used in complex femoral revisions to improve exposure while preserving soft tissue and neurovascular structures. In the setting of a short ETO, surgeons may choose between standard (STD) and intermediate revision (REV) stems, although their primary stability remains unclear. Clinically, STD are still used after short ETO with low rates of aseptic loosening, aiming for proximal bone loading to reduce stress shielding. We therefore hypothesized that STD would demonstrate non-inferior axial and torsional stability compared with REV in a short open ETO model. MATERIALS AND

methodsA biomechanical model using SYNBONE

resultsREV showed higher axial stiffness (297.5 ± 39.7 N/mm) than STD (245.9 ± 33.2 N/mm, p = 0.035) and greater axial failure load (1228.1 ± 86.8 vs. 1002.5 ± 114.1 N, p = 0.003). Torsional stiffness and peak torque were comparable between groups. Axial failure with REV occurred at the distal stem tip, while STD fractured through the ETO. Torsional failure produced spiral fractures from the distal ETO in both groups.

conclusionsUnder time-zero worst-case conditions without ETO refixation, the REV demonstrated higher axial stability, while torsional stability was comparable. The STD provided sufficient primary stability after short open ETO, supporting its potential use when revision stem implantation is not required.

Indexed as

Arthroplasty, Replacement, HipFemurHip ProsthesisOsteotomyBiomechanical PhenomenaHumansProsthesis DesignProsthesis FailureReoperationETOExtended trochanteric osteotomyHipRevision arthroplastyRevision stemStandard stem

Identifiers

PMID41995754
PMCPMC13090256

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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.