Axial rotation alignment of the femoral prosthesis in total knee arthroplasty and biological effect of patellofemoral joint
10.3969/j.issn.2095-4344.2016.13.002
- VernacularTitle:全膝置换中股骨假体轴向旋转对线与髌股关节生物性能的变化
- Author:
Jun YANG
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2016;20(13):1838-1844
- CountryChina
- Language:Chinese
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Abstract:
BACKGROUND:Total knee arthroplasty needs to use the femoral prosthesis. The prosthesis wil produce a certain axial rotation on the line, and affect the biological properties of the patelofemoral joint. OBJECTIVE: To explore the effect of axial rotation of prosthesis on biological effect of the patelofemoral joint in total knee arthroplasty. METHODS:Ten fresh human cadaver knees were obtained from the Specimen Room of Second Affiliated Hospital (Henan Province Hospital of Traditional Chinese Medicine) of Henan University of Traditional Chinese Medicine. Knee joint experimental platform was established to simulate the human ankle and hip joint, providing 3 degrees of freedom of tibia and 2 degrees of freedom of femur. Femoral component rotation angle was measured. Total knee arthroplasty was conducted. The sensitive pressure-sensitive film was used to measure the transepicondylar axis rotation of 2°, 2° through the femoral epicondylar axis rotation, the femoral epicondylar axis rotation of 4°, and paralel to the femoral epicondylar axis, external rotation of the femoral epicondylar axis 4°, and the patelofemoral contact pressure and patelofemoral contact area paralel with Whiteside’s line. RESULTS AND CONCLUSION:The peak contact pressure inside and outside the joint at different axial rotation of the femoral prosthesis paraleled with femoral epicondylar axis was in a balanced state, and significant differences were detected as compared with other rotation manners (P < 0.05). No significant difference was found in patelofemoral contact area at different directions. These findings suggest that femoral prosthesis axial rotation on the line in total knee arthroplasty wil have a certain effect on biological properties of patelofemoral joint. The peak contact pressure inside and outside patelofemoral joint in the paralel state of the femoral epicondylar axis does not appear excessive low or high state on one side, but in a balanced state. It can be chosen as a reference standard of rotational alignment of the femoral prosthesis during the operation.
