Chinese Journal of Tissue Engineering Research ›› 2016, Vol. 20 ›› Issue (8): 1081-1088.doi: 10.3969/j.issn.2095-4344.2016.08.003

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Primary loading causes bone cement-stem interface debonding injury

Zhang Lan-feng1, Ge Shi-rong1, Liu Hong-tao2, Guo Kai-jin3   

  1. 1School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China; 2School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China; 3Department of Joint Surgery, the Affiliated Hospital of Xuzhou Medical College, Xuzhou 221000, Jiangsu Province, China
  • Received:2015-12-09 Online:2016-02-19 Published:2016-02-19
  • Contact: Zhang Lan-feng, School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China
  • About author:Zhang Lan-feng, Studying for doctorate, School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China
  • Supported by:

    a grant supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions; Qinglan Foundation from Jiangsu Province of China, No. 04150006; the Graduate Education Innovation Project in Jiangsu Province of China, No. KYLX_1376; the Scientific Research Project of Health and Family Planning Commission of Jiangsu Province of China, No. H201528

Abstract:

BACKGROUND: The main reason for the postoperative loosening of cemented prosthesis is interfacial debonding and bone cement internal damage. Most studies have suggested that both of them occur in the process of fatigue damage, however, little is reported on primary loading that results in the initial damage to the bone cement-stem interface and inside of bone cement.
OBJECTIVE: To study the mechanical properties of bone cement-stem interface, and the effect of crack formation in bone cement on interfacial loosening.
METHODS: The cement-titanium alloy handle implant components were prepared. The maximum adhesive force of bone cement-stem interface was measured using push-in experiment. The cement damage and crack in the process of bone cement-handle interfacial debonding were monitored online using acoustic emission tester. The non-destructive testing on the metal surface and the inner layer of bone cement cylinder was conducted using three-dimensional surface profiler, ultrasonic microscopy and X-ray detector.  
RESULTS AND CONCLUSION: The online monitoring results of debonding experiment and acoustic emission tester demonstrated that the initial damage of bone cement initiated in the primary loading of patients after operation, rather than at fatigue damage stage. Bone cement coffin caused cracks initiation mainly due to the combination effect of radial and axial stress. The bone cement-stem interfacial shear lag effect could not prevent the gradual extension of interface and inner coffin crack from top to bottom. The bone cement defects formed in solidification process was likely to affect the mechanical properties of the material, and eventually induced the crystal face and macromolecular chain fractures, forming silver striated cracks and leading component failure.