Distal femoral rotational axis reference method based on magnetic resonance technique

doi:10.3969/j.issn.2095-4344.2016.26.018

Abstract

Abstract:

BACKGROUND: Problems regarding the prosthesis in the horizontal plane and the rotation of the femur and tibia prosthesis on line are relatively weak. The distal femoral rotation axis is mainly the transepicondylar axis. Due to patient differences as well as anatomy and intraoperative display, it is difficult to accurately locate the axis in the process of knee arthroplasty.

OBJECTIVE: To investigate application of magnetic resonance technique in determining the axis of rotation of the distal femur, to provide reference and basis for femoral rotational alignment during total knee arthroplasty.

METHODS: Data of 122 cases without knee joint disease, who were diagnosed and treated in the Department of Orthopedics of Nanyang City Center Hospital from September 2014 to October 2015, were analyzed. Magnetic resonance technique was used to measure femoral epicondyle axes (STEA), femoral epicondyle axes (CTEA), the anteroposterior axis (APL) and femoral shaft (PCL). Simultaneously, magnetic resonance technique was utilized to measure femoral ankle angle (PCA), ankle twist angle (CTA), axis vertical line and ankle axis angle (PAPA). Each data were tested three times, and the average value was calculatd. We analyzed the method of magnetic resonance technique to determine reference axis of distal femoral rotation.

RESULTS AND CONCLUSION: (1) Accuracy of the angle close to surgical transepicondylar axis: 3° PCL> CTEA > APL vertical line. (2) No significant difference in PCA was detected in two sets of measurements (P > 0.05). CTA and PAPA parameters in the first measurement by magnetic resonance imaging diagnosis were significantly lower than the second measurement (P < 0.05). (3) Results indicate that magnetic resonance technology provides ideal reference for distal femoral rotation, can accurately measure the CTA, PCA, PAPA and other indicators. It is a more reliable determination method and can be used in scientific determination of femoral rotational alignment reference axis in total knee arthroplasty. Except STEA, the accuracy of 3° PCL is highest.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Arthroplasty, Replacement, Knee, Prosthesis Implantation, Tissue Engineering

CLC Number:

R318

Lv Guo-yi, Li Zhen-xu, Xiang Xu, Li Jian-ling, Yin Jie. Distal femoral rotational axis reference method based on magnetic resonance technique[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(26): 3916-3922.

Figures/Tables 2

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