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Abstract Objective To find the relationship among femoral condyle sagittal transverse diameter ratio，height of patella and posterior tibial slope angle and provide guidance for the selection in size of the femoral prosthesis and posterior condylar osteotomy line arrangements in Total knee arthroplasty.Methods CT images were scanned，three-dimensional reconstruction was rebuilt and measuredusing HiNet PACS 5 software.According to the different gender and side group，received the measurement data using linear regression，t test and other statistical methods.P value less than 0.05 was defined as statistically significant.Results The ratio of femoral condyle and sagittal transverse diameter was in the range of 0.80～0.97 obtained from 160 normal knees；The heightof patellarand posterior tibial slope angle：Female group was significantly greater than the male group (P＜0.001 and P＜0.001，respectively)and no significant difference between left and right side (P＞0.05 and P＞0.05，respectively).To obtain the normal linear parameters，the ratio of femoral condyle and sagittal transverse diameter was positively correlated with the height of patella(male，r2＝0.358；female，r2＝0.689，respectively)，while the ratio of femoral condyle and sagittal transverse diameter was not positively correlated to patellar height orposterior tibial slope angle.Conclusion Chinese knee joint femoral condyle sagittal transverse diameter ratio is relatively larger than the current mainstream foreign femoral condyle prosthesis，and it is positively correlated with the height of patella.However，in TKA increase or decrease the posterior tibial osteotomy angle，cannot change the posterior condylar osteotomy line position and the relative height of patella.
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