全膝关节置换术前应用双下肢全长摄影对不同体位下肢负重轴线的影响

目的 探讨全膝关节置换术前应用双下肢全长摄影对不同体位下肢负重轴线的影响.方法 选择在我院接受全膝关节置换术患者138例,均拍摄两组双下肢全长正位片,一组以骨盆正中,下肢呈中立位为标准,另一组以膑骨正中,胫骨覆盖腓骨小头内1/3为标准方案.比较两种体位下的股骨胫骨机械轴夹角等数据,并评估两者图像质量.术后随访,比较术前...

The effect of full-length photography of both lower extremities applied before total knee arthroplasty on weight-bearing axial alignment of the lower extremities at different positions

Objective To investigate the effect of full-length photography of both lower extremities applied before total knee arthroplasty on weight-bearing axial alignment of the lower extremities at different positions.Methods One hundred and thirty-eight patients who underwent total knee arthroplasty in our hospital were enrolled in this study.Two sets of full-length frontal radiographs of both lower extremities were taken.One set of radiographs were taken with the center of the pelvis and the lower limb at neutral position as the standard.However,another set of radiographs was taken with the center of the patella and the tibia covering 1/3 of the fibular head as the standard.Data like the angle between femur and tibial mechanical axis at the two positions were compared,and the image quality was evaluated.Postoperative follow-up was performed to compare knee joint function before and after surgery.Results Statically significant differences were found in femoral bowing angle(FBA),mechanical lateral distal femoral angle(mLDFA)and mechanical medial proximal tibial angle(mMPTA)obtained by pelvic median and patella median photography(P<0.05),and those obtained by the former method were significant larger than those by the latter.However,no significant difference was found in the mechanical femorotibial angle(mFTA)(P>0.05).No significant differences were found in the quality of images taken at the two positions(P>0.05).After surgery,pain,function,range of motion,flexion deformity and stable type scores were increased significantly(P<0.05).Conclusion Application of full-length photography of both lower extremities at the median pelvic position before total knee arthroplasty can correctly display the patient's own lower limb force line,reduce the errors caused by improper operation,and optimize the angle measurement of lower limb force line at different photography positions.