Fig. 1
From: Application of different patella height indices in patients undergoing total knee arthroplasty
Knee joint measurements. A: diagonal length of patella. B: length of patellar tendon. C: length of patella articular surface. D: distance from patellar articular surface to tibial tuberosity. E: perpendicular height from the plateau line of the tibia to the lower end of the patellar articular surface. F: distance between patellar articular surface and anterior border of the tibial plateau. IS index = B/A, MIS index = D/C, BP index = E/C, CD index = F/C