Enhancement of initial stability of press-fit femoral stems using injectable calcium phosphate cement: an in vitro study in dog bones
| Autor: | W.S.J. van de Wijdeven, John A. Jansen, Nico Verdonschot, Johannes G. C. Wolke, E.M. Ooms, M.F. Schoenmaker, Marieke M M Willems |
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| Rok vydání: | 2004 |
| Předmět: |
Tissue engineering and reconstructive surgery [UMCN 4.3]
Calcium Phosphates Joint Instability Quality Control musculoskeletal diseases medicine.medical_specialty Materials science Arthroplasty Replacement Hip medicine.medical_treatment Biophysics chemistry.chemical_element Bioengineering In Vitro Techniques Calcium Prosthesis Injections law.invention Weight-Bearing Biomaterials Intramedullary rod Motion Femoral head Dogs law medicine Animals Femur Cementation Cement Bone Cements Adhesiveness Initial stability Surgery Equipment Failure Analysis medicine.anatomical_structure chemistry Mechanics of Materials Ceramics and Composites Hip Joint Implant Biomedical engineering |
| Zdroj: | Biomaterials, 25, 3887-94 Biomaterials, 25, 17, pp. 3887-94 |
| ISSN: | 0142-9612 |
| DOI: | 10.1016/j.biomaterials.2003.10.067 |
| Popis: | Item does not contain fulltext In this in vitro study we evaluated the initial stability of cementless femoral stems using an injectable calcium phosphate (Ca-P) cement. The cement was not used to form a cement mantle as is routinely done in PMMA cemented prostheses but functioned as an additive to fill the small gaps that exist between a press-fit placed titanium plasma sprayed implant and the bone bed. Six pair of Beagle femora were used in this study. In a random fashion, one femur of each pair was used for placement of a prosthesis without Ca-P cement, the contralateral was used for press-fit placement after injection of the calcium phosphate cement into the intramedullary canal. The reconstructions were placed in a MTS testing machine, tilted 15 degrees in varsus and 15 degrees of endorotation to obtain a physiological load on the femoral head. The load was applied stepwise from zero to a maximum of 100, 250 and 400 N, respectively. At each loading step the load was applied dynamically at a frequency of 1 Hz for 30 min. Between the loading steps, the load was removed for 10 min to allow elastic recovery. The stability of the stems was determined at each loading step with roentgen-stereophotogrammetric analysis. Results showed that with the prostheses without Ca-P cement the most important displacements were movement into varus (max. 818 microm under 400 N) and subsidence (max. 587 microm under 400 N). The displacements showed large variation. After unloading some elastic recovery occurred. In the specimens with Ca-P cement, displacements were negligible. As determined by an F-test the variations found were significantly smaller for the press-fit+Ca-P cement relative to the press-fit prosthesis at all loading steps (p |
| Databáze: | OpenAIRE |
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