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Rotation of the femoral component referencing the PCA. The differences between rotation of the femoral component and the PCA are shown. Only 45 femoral components (51%) were implanted in 0° (± 1°) or 3° (± 1°) external rotation referenced to the PCA. Furthermore by use of the PCA method 38 prostheses (44%) would have been implanted in an internal malrotation
