FFC: frontal femoral component angle. It is typically regarded as optimal when being 2–7° in valgus.
FTC: frontal tibial component angle, which is regarded as optimal when being at a right angle. A varus position of more than 3° has generally been found to increase the failure rate of the prosthesis.
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Captions
Postoperative X-ray of normal knee prosthesis, anteroposterior view, annotated