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. 2021 Feb;9(3):212. doi: 10.21037/atm-20-3488

Figure 6.

Figure 6

Percentage of acetabular cup coverage (PACC) and centre of rotation (COR) of all subgroups; data are presented as mean (95% CI). The novel patient-specific instrument (PSI) for qualifying conditions of the PACC showed a significant advantage over the conventional operation (CO) in patients with Crowe III developmental dysplasia of the hip (DDH), but not in those with Crowe I, II and IV DDH. The novel PSI for qualifying conditions of the COR also showed a significant advantage over CO in patients with Crowe III and Crowe IV DDH, but not in those with Crowe I and II DDH. The accuracy of qualifying conditions of the PACC showed no difference between PSI groups and CO groups in patients with Crowe I, II and IV DDH; however, the qualifying conditions of the PACC in PSI groups were much better than those in CO groups in patients with Crowe III DDH. **, COR of two cases of the CO-Crowe I group.