Fig. 4From: A new method for evaluation of patellar height and the position of the joint line before and after total knee arthroplastyBland-Altman plots of the preoperative and postoperative differences for measuring patellar height between twice measurements by the same author with a 3 months interval: the axis-patella (AP) index (A and C, respectively), the joint axis-patella (jAP) index (B and D, respectively)Back to article page