A New Stem Extractor with Specific Multigrip Pliers for Revision Hip Arthroplasty – A Biomechanical Investigation

Spross, Christian; Yates, Piers

doi:10.5301/hipint.5000379

Cited by 1 publication

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References 4 publications

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“…Spross et al investigated the number of blows that two multiplier grip extractors with differently angled jaws, as well as a universal extractor, would require to extrude a restrained femoral stem, as well as the number of times that the extraction device would detach from its point of fixation, with more than five times needed to re-attach the device being defined as failure. 5 They tested two femoral stems, each with a tapered or non-tapered neck.…”

Section: Discussionmentioning

confidence: 99%

Use of a threaded-coupled femoral extraction device allows for higher extraction force when compared to loop or vice grip devices; A potted stem analysis

Phen

Godfrey

Edwards

et al. 2022

Journal of Clinical Orthopaedics and Trauma

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Background: Extraction of a well-fixed femoral stem during revision total hip arthroplasty presents a technical challenge to the operating surgeon. The option of several stem designs during implantation necessitates the availability of extraction tools to be utilised intra-operatively. This study aims to compare the amount of axial force generated from using a threaded-coupled extraction device, loop extraction device, and vice-grip universal extraction set on a potted total hip arthroplasty stem construct. Methods: A size 7 Stryker Accolade® II femoral stem (Stryker, Mahwah, NJ) was potted within a 5.20 cm inner diameter polyvinyl chloride pipe using a potting medium with tensile strength and lap shear of 1000psi. This construct was coupled to a material testing system whose force transducer was calibrated to a recording speed of 1000 frames per second. The extractors were coupled to the potted stem, and a force of 1.32 J was applied ten times sequentially to each construct. Force was recorded in Newtons. Results: The maximum average force for the threaded, loop, and Shukla extractors was 111.46 ± 1.77 N, 90.22 ± 0.87 N, and 64.70 ± 9.03 N (p < 0.01). Loss of coupling was not experienced with any extractor. Conclusion: Within our study, the forces observed per constant load when utilising a threaded-coupled extraction device that attaches to the shoulder of the implant were significantly higher than those seen when using an extraction device that couples to the neck of the femoral stem.

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Section: Discussionmentioning

confidence: 99%

Use of a threaded-coupled femoral extraction device allows for higher extraction force when compared to loop or vice grip devices; A potted stem analysis

Phen

Godfrey

Edwards

et al. 2022

Journal of Clinical Orthopaedics and Trauma

View full text Add to dashboard Cite

show abstract

A New Stem Extractor with Specific Multigrip Pliers for Revision Hip Arthroplasty – A Biomechanical Investigation

Abstract: The new extractor with specific pliers for neck/shoulder grip seems to be a valuable tool for stem extraction in revision hip arthroplasty. Compared to UnMod, the neck-pliers showed better grip on the tapered neck and the shoulder-pliers performed the best on the nontapered neck.

Cited by 1 publication

References 4 publications

Use of a threaded-coupled femoral extraction device allows for higher extraction force when compared to loop or vice grip devices; A potted stem analysis

Use of a threaded-coupled femoral extraction device allows for higher extraction force when compared to loop or vice grip devices; A potted stem analysis

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