Fig. 2.

One-point and two-point method knee joint centre locations. Where 1P = one-point; 2P = two-point; KJC = knee joint centre; KJC1 = tibial spine base mid-point; KJC2 = tibial spine tips mid-point; KJC3 = tibial plateau centre; FAA = femoral anatomic axis; TAA = tibial anatomic axis. (a) one-point method at tibial spine base mid-point; (b) one-point method at tibial spine tips mid-point; (c) one-point method at tibial plateau centre defined by line connecting lateral and medial margins of tibial plateau (excluding marginal osteophytes); (d) two-point method using femoral notch and tibial spine base mid-point; (e) two-point method using femoral notch and tibial spine tips mid-point; (f) two-point method using femoral notch and tibial plateau centre; (g) describing one-point method; (h) describing two-point method.