Influence of Knee Alignment and Pelvis Rotation on Accuracy of Radiograph Measurements Before Total Knee Arthroplasty

The Influence of Lower Extremity and Pelvic Alignment on Accuracy of Hip-Knee-Ankle Radiograph Measurements Before Total Knee Arthroplasty

The aim of this study is to determine the accuracy of long leg standing X-rays with respect to coronal alignment of the knee.

Long leg standing x-ray is a routine examination to measure the femoral valgus angle before a total knee arthroplasty. Newer studies have shown that coronal leg alignment influences the rotation of the distal femoral part. This rotation might influence the measurements obtained with a long leg standing x-ray.

The primary purpose of this study is to determine whether there is a significant difference between 2D measurements taken on the x-ray and 3D measurements obtained with a CT scan.

Inclusion Criteria:

Knee osteoarthritis scheduled for knee arthroplasty

Exclusion Criteria:

• previous leg deformities or surgery that changes alignment