Fig. 2.

Percentages of the key TW3 stages of the ulnar 4 digital epiphyses corresponding with each TOCI stage. The hand radiographs illustrate the TW3 stage (linked by dotted lines) of the corresponding epiphyses shown in the respective bar charts. The letters B through I on the drawings of the thumb refer to the key radiographic features of maturity indicators represented by the different TOCI stages described in our previous article⁴.The diagram at the upper right (viii) is included for easier referencing to the corresponding growth phase at puberty. DP, MP, and PP = distal, middle, and proximal phalangeal, and MC = metacarpal.