Relationship between pull-out strength and oscillation angle in bipolar cups: an in vitro study.
J Orthop Surg (Hong Kong)
; 24(2): 209-15, 2016 08.
Article
em En
| MEDLINE
| ID: mdl-27574265
ABSTRACT
PURPOSE:
To compare the past and present bipolar hip arthroplasty (BHA) models in terms of balance between pull-out strength and oscillation angle (OA).METHODS:
The pull-out strength and OA of 8 BHA models were compared UPF-II, IBC, and Tandem XLPE (Smith & Nephew); Ringloc x (Biomet); J-FX (DePuy); Bipolar (Nakashima Medical); Multipolar (Zimmer); and Centrax (Stryker).RESULTS:
Respectively for the UPF-II, IBC, Tandem, Ringloc, J-FX, Nakashima Bipolar, Multipolar, and Centrax, the mean pull-out strength was 2219 N, 3303 N, 1503 N, 951 N, 1453 N, 1856 N, 1536 N, and 753 N, whereas the mean OA was 54.2°, 53.8°, 64.0°, 73.2°, 63.0°, 65.4°, 55.6°, and 75.4°. The OA was lower in the integrated types. For pull-out strength of the locking mechanism, the integrated type (IBC and Nakashima) was stronger than the metal or polyethylene ring-lock type (all others). The pull-out strength and OA were negatively correlated (r= -0.881, p=0.007), and the balance between the 2 varied for different models.CONCLUSION:
There is a trade-off between the pullout strength and OA; optimal balance between the 2 should be based on each patient's need.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Artroplastia de Quadril
/
Prótese de Quadril
Limite:
Humans
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article