Fig. 1From: Short-term outcomes of Oxford unicompartmental knee arthroplasty with coronal subluxation of the knee: a retrospective case–control studyThe proximal tibial axis (solid line) is drawn through the midpoint of the tibial crest and the midpoint of the tibial shaft about 120 mm from the tibial articular surface, with a parallel dotted line representing the proximal tibial axis (dotted line) being drawn through the apex of the femoral intercondylar fossa. The distance between these two lines is the CTFS valueBack to article page