Performance of bone cements: are current preclinical specifications adequate?
Background Current specifications (standards) for preclinical testing of bone cements (ISO 5833: 2002, ASTM F451-99a) require simple mechanical testing after ageing for 24 h under dry conditions at 23°C. Some bone cements have fulfilled the requirements in the specifications, and yet had inferior cl...
| Published in: | Acta Orthopaedica Vol. 79; no. 6; pp. 826 - 832 |
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| Main Authors: | , , , , |
| Format: | research tables/charts Journal Article |
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Medical Journals Sweden AB
Dec2008
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105598948&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105598948 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 17453674 1BVL jtl: Acta Orthopaedica issn: 17453674 maglogo: N pubinfo: dt: Dec2008 vid: 79 iid: 6 pid: 59195 pub: Medical Journals Sweden AB artinfo: ui: 105598948 2010136439 10.1080/17453670810016920 NLM19085502 105598948 ppf: 826 ppct: 6 formats: fmt: @attributes: type: P tig: atl: Performance of bone cements: are current preclinical specifications adequate? aug: au: Nottrott M Mølster AO Moldestad IO Walsh WR Gjerdet NR affil: Department of Orthopaedic Surgery, Haukeland University Hospital,,Section for Orthopaedic Surgery, Department of Surgical Sciences, University of Bergen, Bergen, Norway sug: subj: Bone Cements Standards Materials Testing Standards Analysis of Variance Biophysical Instruments Comparative Studies Compressive Strength Data Analysis Software Descriptive Statistics Funding Source Stress, Mechanical Temperature Human ab: Background Current specifications (standards) for preclinical testing of bone cements (ISO 5833: 2002, ASTM F451-99a) require simple mechanical testing after ageing for 24 h under dry conditions at 23°C. Some bone cements have fulfilled the requirements in the specifications, and yet had inferior clinical results. Clinically, bone cements are subjected to complex loading patterns in a moist or wet environment at 37°C. Thus, both the validity and the robustness of current standard testing protocols can be questioned. Methods We examined the influence of temperature and storage medium on the properties of bone cement. We also compared the results of storage and testing under standard conditions of 23°C in dry air, with the results obtained at 37°C in water or plasma. Results The dry specimens showed an increase in strength and elastic modulus with time, while the values of the wet ones decreased. There was no difference between specimens stored in water or in plasma. Ultimate compressive strength of dry specimens after 24 h was 1.16 times higher than that of the ones stored wet, increasing to 1.34 times after 1 month, and 1.46 times after 6 months (p<0.001 for all comparisons). Interpretation Testing under dry conditions-as required in current standards-always gave higher values for mechanical properties than did storage and testing under more physiological conditions. The sensitivity of test values to different environments implies that testing conditions for bone cements should be scrutinized in order to develop more relevant testing protocols that reflect the in vivo environment more closely. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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