牛津膝关节单髁置换术髓内定位误差的有限元分析

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Abstract Objective To simulate the intramedullary localization process of Oxford unicompartment knee arthroplasty (OUKA) by digital technology，and to analyze the error of intramedullary guide of the rodwith different length by finite element analysis.Methods The patients underwent OUKA from January 2019 to October 2019 in our department were selected prospectively.The three-dimensional model of femur was established by using the software of mimics and 3-matics，and thepositioning process in OUKA was simulated.Two kinds of intramedullary rods with different lengths (30 cm and 20 cm) were inserted respectively.The finite element analysis was carried out by using the software of Ansys.The swinging of the intramedullary rod in the intramedullary cavity was simulated，and the distance of the rod end moving was obtained.The maximum distance and the maximum displacement of the rod end in the sagittal and coronal plane of the intramedullary cavity were calculated.The data were analyzed statistically.Results The maximum swing range of 30 cm rod was (1.10±0.72)degrees in sagittal plane of the femoral medullary and (0.85±0.55)degrees in coronal plane，while (4.36±0.95)degrees in the sagittal and (3.77±1.00)degrees in the coronal of 20 cm rod.The maximum swing range of the same rod in sagittal plane was larger than that in coronal plane，and the difference was significant (P＜0.05).On the sagittal and coronal plane，the maximum swing range of 30 cm rod was significantly smaller than that of 20 cm rod (P＜0.05).There was a significant correlation between the swing range of 30 cm and 20 cm rods.Conclusion In this study，a finite element model of the movement of the rod in the marrow cavity is established.It is proved that the error of the 30 cm rod is significantly less than that of the 20 cm rod，and its positioning is more accurate.However，for patients in small size，it is possible that the intramedullary rod cannot be completely inserted or deformed after insertion.For these patients，we recommend 20 cm rod.

Key words： unicompartmental knee arthroplasty prosthesis fitting intramedullary guide finite element analysis

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	Articles by authors
	Xu Cheng
	Nan Shaokui
	Li Haifeng
	et al

Cite this article:

Xu Cheng,Nan Shaokui,Li Haifeng, et al. The Finite Element Analysis of the Deviation of Intramedullary Guides in Oxford Unicompartment Knee Arthroplasty[J]. sygkzz, 2020, 26(12): 1079-1082.

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http://www.sygkzz.com/EN/ OR http://www.sygkzz.com/EN/Y2020/V26/I12/1079

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