From 1995 to 2005, arthrodesis with a reconstruction plate was performed for eight shoulders. The average follow-up period was 44 months. The indications for shoulder arthrodesis were joint destruction as a sequel of tuberculous arthritis, malignant bone tumour, pyogenic arthritis, failed arthrodesis and paralysis of the brachial plexus. The evaluation criteria included bony union and pain.
Purpose:The objective of this study was to compare the bonding strength between cement and an implant according to the cementing time.
Materials and Methods:The two types of cement used were CMW Ⓡ 1 and 3 (Depuy Ltd., Blackpool, UK). Plastic molds containing CMW Ⓡ 1 were pressed onto metal blocks at 2, 4, 5 or 6 minutes after mixing the cement, while molds containing CMW Ⓡ 3 were pressed onto blocks at 3, 5, 6 or 7 minutes after mixing the cement. Tensile strength was tested with using an Instron Model 8874 (Instron Corp., Canton, MA, USA). Tensile strengths were compared using the Kruskal-Wallis test and the Mann-Whitney U test.
Results:The strongest bonding strengths for the tensile load were at 2 minutes post-mixing for CMW Ⓡ 1, and at 3 minutes post-mixing for CMW Ⓡ 3. The strength rapidly decreased after 5 minutes for CMW Ⓡ 1 and after 6 minutes for CMW Ⓡ 3.
Conclusion:This study suggests that the risk of loosening between cement and an implant is likely to be minimized by the surgical technique that considers the bonding strength according to time.
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