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Primary stability of a press-fit cup in combination with impaction grafting in an acetabular defect model.

Authors
  • Schierjott, Ronja A1, 2
  • Hettich, Georg1
  • Baxmann, Marc1
  • Morosato, Federico3
  • Cristofolini, Luca3
  • Grupp, Thomas M1, 2
  • 1 Research & Development Department, Aesculap AG, Tuttlingen, Germany. , (Germany)
  • 2 Department of Orthopaedic Surgery, Physical Medicine & Rehabilitation, Campus Grosshadern, Ludwig-Maximilians University Munich, Munich, Germany. , (Germany)
  • 3 Department of Industrial Engineering, Alma Mater Studiorum-Università di Bologna, Bologna, Italy. , (Italy)
Type
Published Article
Journal
Journal of Orthopaedic Research®
Publisher
Wiley (John Wiley & Sons)
Publication Date
May 01, 2021
Volume
39
Issue
5
Pages
929–940
Identifiers
DOI: 10.1002/jor.24810
PMID: 32691903
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The objectives of this study were to (a) assess primary stability of a press-fit cup in a simplified acetabular defect model, filled with compacted cancellous bone chips, and (b) to compare the results with primary stability of a press-fit cup combined with two different types of bone graft substitute in the same defect model. A previously developed acetabular test model made of polyurethane foam was used, in which a mainly medial contained defect was implemented. Three test groups (N = 6 each) were prepared: Cancellous bone chips (bone chips), tricalciumphosphate tetrapods + collagen matrix (tetrapods + coll), bioactive glass S53P4 + polyethylene glycol-glycerol matrix (b.a.glass + PEG). Each material was compacted into the acetabulum and a press-fit cup was implanted. The specimens were loaded dynamically in the direction of the maximum resultant force during level walking. Relative motion between cup and test model was assessed with an optical measurement system. At the last load step (3000 N), inducible displacement was highest for bone chips with median [25th percentile; 75th percentile] value of 113 [110; 114] µm and lowest for b.a.glass + PEG with 91 [89; 93] µm. Migration at this load step was highest for b.a.glass + PEG with 868 [845; 936] µm and lowest for tetrapods + coll with 491 [487; 497] µm. The results show a comparable behavior under load of tetrapods + coll and bone chips and suggest that tetrapods + coll could be an attractive alternative to bone chips. However, so far, this was found for one specific defect type and primary stability should be further investigated in additional/more severe defects. © 2020 The Authors. Journal of Orthopaedic Research® published by Wiley Periodicals LLC on behalf of Orthopaedic Research Society.

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