The authors conducted a matched-pair study of 62 hips with Tönnis grade 0 and 62 hips with Tönnis grade 1. At minimum 5-year follow-up, they found that patients with Tönnis grade 1 displayed significant improvements in all patient-reported outcome and visual analog scale scores, and there were no significant differences across cohorts in preoperative or postoperative scores or survivorship. Learn more...