Significance of femoral condyle parameters in osteotomy in unicompartmental knee arthroplasty and prosthesis design / 中国组织工程研究

ABSTRACT

BACKGROUND:Knee-parameter measurements play an important role in the designing of the knee prosthesis. Currently, we have more and more research of the total knee replacement, while uni-condylar knee replacement study is few. OBJECTIVE: To obtain the parameters of the normal femoral condyles and explore its correlation with osteotomy and prosthesis design of the knee joint during uni-condylar knee replacement. METHODS: Normal knee joints of 60 cases (60 knees) were selected. We measured the parameters by using thin-section CT scan and post-processing techniques, including arc diameter of the lowest point of the femoral condyle on the coronal plane, arc diameter of the distal point of the posterior condyle of the femur on the transverse plane, arc diameter of the distal point of the posterior condyle of the femur on the sagittal plane, and arc diameter of the lowest point of the femoral condyle on the sagittal plane, and analyzed the correlation with sex and height. RESULTS AND CONCLUSION:The diameter of the arc that passes through the lowest point of femoral medial condyle in the coronal plane was (42.685±1.389) mm. The diameter of the arc that passes through the farthest point of posterior of femoral medial condyle in the cross-section was (42.732±1.440) mm. The diameter of the arc that passes through the lowest point of femoral medial condyle on the sagittal plane was (45.473±1.332) mm. The diameter of the arc that passes through the farthest point of posterior of femoral medial condyle on the sagittal plane was (42.587±1.446) mm. The results illustrate that knee condyle related parameters were positively correlated with height. Parameters in males were significantly greater than in females. The diameter of the arc that passes through the lowest point of femoral medial condyle on the sagittal plane was significantly larger than that of the farthest point of femoral posterior medial condyle on the sagittal plane (P < 0.001). There was no significant difference among the diameter of the arc that passes through the lowest point of femoral medial condyle on the coronal plane, the diameter of the arc that passes through the farthest point of posterior of femoral medial condyle on the cross-section and that of the farthest point of femoral posterior medial condyle on the sagittal plane.