Biomechanics of a cemented short stem: a comparative in vitro study regarding primary stability and maximum fracture load.
Biomechanics
Cadaver
Cemented total hip arthroplasty
Fracture pattern
Micromotion
Migration
Primary stability
Short stem
Journal
Archives of orthopaedic and trauma surgery
ISSN: 1434-3916
Titre abrégé: Arch Orthop Trauma Surg
Pays: Germany
ID NLM: 9011043
Informations de publication
Date de publication:
Oct 2021
Oct 2021
Historique:
received:
14
07
2020
accepted:
20
02
2021
pubmed:
24
3
2021
medline:
26
11
2021
entrez:
23
3
2021
Statut:
ppublish
Résumé
In total hip arthroplasty, uncemented short stems have been used more and more frequently in recent years. Especially for short and curved femoral implants, bone-preserving and soft tissue-sparing properties are postulated. However, indication is limited to sufficient bone quality. At present, there are no curved short stems available which are based on cemented fixation. In this in vitro study, primary stability and maximum fracture load of a newly developed cemented short-stem implant was evaluated in comparison to an already well-established cemented conventional straight stem using six pairs of human cadaver femurs with minor bone quality. Primary stability, including reversible micromotion and irreversible migration, was assessed in a dynamic material-testing machine. Furthermore, a subsequent load-to-failure test revealed the periprosthetic fracture characteristics. Reversible and irreversible micromotions showed no statistical difference between the two investigated stems. All short stems fractured under maximum load according to Vancouver type B3, whereas 4 out of 6 conventional stems suffered a periprosthetic fracture according to Vancouver type C. Mean fracture load of the short stems was 3062 N versus 3160 N for the conventional stems (p = 0.84). Primary stability of the cemented short stem was not negatively influenced compared to the cemented conventional stem and no significant difference in fracture load was observed. However, a clear difference in the fracture pattern has been identified.
Identifiants
pubmed: 33755800
doi: 10.1007/s00402-021-03843-x
pii: 10.1007/s00402-021-03843-x
pmc: PMC8437915
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1797-1806Informations de copyright
© 2021. The Author(s).
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