Fig. 5

A A postoperative anterior view radiograph taken in the operating room indicated that two screws had cross-fixed the tibial tubercle. B A postoperative lateral radiograph of the left knee, also taken in the operating room, showed a substantial reduction in patellar height; the Caton–Deschamps index had decreased from 1.7 preoperatively to 1 postoperatively. C A lateral radiograph taken at the 2-year follow-up postoperatively still maintained a Caton–Deschamps ratio (a/b) of 1 and an morphology ratio (c/a) of 1.4. D The 2-year postoperative follow-up revealed that the flexion angle was 120° and the extension angle was 0° E