Patellar height ratios in children: An interobserver study of three methods

Several indices for patellar height measurement have been described to rela te patellofemoral instability and maltracking. No known study has proved in terobserver reliability of these indices when applied to growing knees. Thi s study included comparisons of three of these indices: Caton-Deschamps, Bl ackburne-Peel, and Koshino. Three observers measured patellar height on 36 lateral radiographs of children's knees. The best interobserver agreement w as achieved by the Caton-Deschamps method, a simple, reliable, and reproduc ible index that is not affected by skeletal maturation.