Assessment of femoral and tibial component rotation after total knee arthroplasty

The success in total knee arthroplasty is having a close relation with the appropriate position on the components. Altough the wrong alignment is the most important couse of early unsuccessfulness because of the instability and patellofemoral complications,it also is the cause of long term unsuccessfulness because of the polietylen erosion and technique problems.The aim of this study is, meausuring the component rotation after total knee arthroplasty, discussing the causes of malrotation.And also we examine the result?s clinical reflections ,according to the hospital for special surgery scor test.İn this study,49 knees of 37 patient, having total knee arthroplasty examined.Using the CT scans, the component rotations were meausured based on predetermined landmarks, surgical epicondylar axis and medial 1/3 of tibial tubercule,and also on patients? knees, the hospital for special surgery scor test were determined.For the participation of the study patients? knees must be after primer total knee arthroplasty, patellar component must not be changed, behind crosswise ligament must be saved, must be used stabil insert and the knees mustn?t have problem with extension.In conclusion, there were significant difference, between the femoral component rotation value we got with the use of CT scans and the target value(-3)we determined before(p<0.01). Using the same method , there were significant difference between the tibial component rotation value and our target value(0)(p<0.01)The results made us think that,we have to look over the landmarks and guides we use in surgery.Also we found that, the femoral and tibial component rotation values have no significant effect on HSS scor and flexion degree (p>0.05)