Chinese Journal of Tissue Engineering Research ›› 2016, Vol. 20 ›› Issue (13): 1838-1844.doi: 10.3969/j.issn.2095-4344.2016.13.002

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Axial rotation alignment of the femoral prosthesis in total knee arthroplasty and biological effect of patellofemoral joint

Yang Jun   

  1. Department of Joint, Second Affiliated Hospital (Henan Province Hospital of Traditional Chinese Medicine), Henan University of Chinese Medicine, Zhengzhou 450002, Henan Province, China
  • Received:2016-02-14 Online:2016-03-25 Published:2016-03-25
  • About author:Yang Jun, Master, Attending physician, Department of Joint, Second Affiliated Hospital (Henan Province Hospital of Traditional Chinese Medicine), Henan University of Chinese Medicine, Zhengzhou 450002, Henan Province, China

Abstract:

BACKGROUND: Total knee arthroplasty needs to use the femoral prosthesis. The prosthesis will produce a certain axial rotation on the line, and affect the biological properties of the patellofemoral joint.
OBJECTIVE: To explore the effect of axial rotation of prosthesis on biological effect of the patellofemoral 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 parallel to the femoral epicondylar axis, external rotation of the femoral epicondylar axis 4°, and the patellofemoral contact pressure and patellofemoral contact area parallel with Whiteside’s line.
RESULTS AND CONCLUSION: The peak contact pressure inside and outside the joint at different axial rotation of the femoral prosthesis paralleled 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 patellofemoral contact area at different directions. These findings suggest that femoral prosthesis axial rotation on the line in total knee arthroplasty will have a certain effect on biological properties of patellofemoral joint. The peak contact pressure inside and outside patellofemoral joint in the parallel 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.