A new method for evaluation of patellar height and the position of the joint line before and after total knee arthroplasty

摘要

Representation of the four classical methods used for measuring patellar height. As represented in A and B (preoperative and postoperative radiographs, respectively), the Insall-Salvati index is calculated by “a1/b1”, and the modified Insall-Salvati index is calculated by “a2/b2”. As represented in C and D (preoperative and postoperative radiographs, respectively), the Caton-Deschamps index is defined as “a1/b”, and the Blackburne-Peel index is defined as “a2/b”