Relationships of the posterior condylar angle to the femoral shaft-transcondylar angle,the tibial plateau-tibial shaft angle and the femoral shaft-tibial shaft angle in ostoearthritic knees / 中国矫形外科杂志

[Objective] To develop a new method of measuring the posterior condylar angle(PCA)interoperatively,and determine the relationships of the PCA to the femoral shaft-transcondylar angle(FSXC)、the tibial plateau-tibial shaft angle(TPTS)and the femoral shaft-tibial shaft angle(FSTS)in southern Chinese people with osteoarthritic knees.[Methods]During July 2007 to March 2008,the PCA was measured directly in 30 osteoarthritic knees undergoing total knee arthroplasty with the PCA Conimeter designed by the author.There were 29 patients including 3 males and 26 females,and the average age was 66.6 years(range,50~78 years),18 left knees and 12 right knees.The radiologic measurements were performed preoperatively on weight-bearing long leg AP radiographs,which included FSXC,TPTS and FSTS.A linear correlation analysis was performed to determine the relationships of PCA to the FSXC,TPTS and FSTS.[Results]The value of the PCA was 5.2??2.6?.The values of the FSXC and TPTS were 8.6??2.9?and 4.1??4.0?,and both had significant linear correlationships with the value of the PCA(P

Measurement of the Posterior Condylar Angle in Koreans : Comparison between Three Dimensional Computed Tomography Study and Magnetic Resonance Imaging Study

PURPOSE: This study is to measure the posterior condylar angle (the angle between the femoral epicondylar axis and the femoral posterior condylar axis) which is commonly used for determining the degree of femoral component rotation during total knee replacement with magnetic resonance imaging (MRI) and three dimensional computed tomography (3D CT) and to assess the difference of this angle in Koreans. MATERIALS AND METHODS: We examined the 257 knee MRIs and 118 knee 3D CTs. And we measured the clinical posterior condylar angle in MRIs, and the clinical and surgical posterior condylar angle in 3D CTs. RESULTS: The clinical posterior condylar angle on MRI was male, 5.56degrees and female, 5.81degrees (mean, 5.66degrees). The clinical posterior condylar angle was male, 5.48degrees and female, 5.85degrees (mean, 5.55degrees), and the surgical posterior condylar angle was male, 3.68degrees and female, 4.02degrees (mean 3.74degrees) on 3D CT. There was no statistical difference in clinical posterior condylar angle between MRI and 3D CT (p>0.05) and between male and female(p>0.05). CONCLUSION: There was no difference in clinical posterior condylar angle between MRI and 3D CT. We suggest that 3degrees external rotation of femoral component from posterior condylar axis may not be enough in Koreans during total knee replacement.