A novel method to improve femoral head and stem taper stability intraoperatively in total hip arthroplasty – a proof of concept study

Mechanically assisted crevice corrosion (MACC) has been associated with the compromised durability and fixation of modular total hip implants, adverse reaction of local tissue, and other undesirable clinical outcomes in total hip arthroplasty (THA). MACC is primarily caused by the relative motion be...

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Bibliographic Details
Published in:Orthopaedics & traumatology, surgery & research surgery & research, 2022-12, Vol.108 (8), p.103284-103284, Article 103284
Main Authors: Dun, Shouchen, Lim, Boon Him, Swope, Stephen W., Whitaker, Dustin R.
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Hip - methods
Corrosion
Femoral head
Femur Head - surgery
Hip Prosthesis
Humans
Impaction
Proof of Concept Study
Prosthesis Design
Prosthesis Failure
Stem taper
Total hip arthroplasty (THA)
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Summary:Mechanically assisted crevice corrosion (MACC) has been associated with the compromised durability and fixation of modular total hip implants, adverse reaction of local tissue, and other undesirable clinical outcomes in total hip arthroplasty (THA). MACC is primarily caused by the relative motion between the femoral head and stem. To minimize the relative motion the taper connection between the two components must be strong enough. The current study addressed the following questions: (1) Does increasing the mass of the femoral stem improve the taper connection strength intraoperatively? (2) Does increasing the mass of the femoral stem reduce the risk of periprosthetic tissue damage intraoperatively? Increasing the mass of the femoral stem improve the taper connection strength intraoperatively. During the experiment, femoral heads were impacted onto the stem tapers with and without an additional weight attached to the stem. The femoral heads were then pulled off to investigate the strength of the taper connection. The stem displacement and acceleration at impaction were also measured to evaluate the risk of periprosthetic tissue damage. The results showed that the pull-off force was increased by 24% (p=0.011, n=6) when an additional weight was attached to the stem. The additional weight also reduced the maximum stem acceleration and maximum stem displacement by 37% (p
ISSN:1877-0568
1877-0568
DOI:10.1016/j.otsr.2022.103284