EP6.73 Changes in the Characteristics of Patients Undergoing FAI Surgery: A Prospective Multicenter Cohort Comparison of Early and Modern FAI

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Abstract Background: We previously published multi-centered studies about FAI to understand pathophysiology and outcomes. Now, we will compare the contemporary and historical cohorts to understand the similarities and differences. Baseline demographic, imaging, and surgical data will be presented. Methods: This is a multi-institutional cohort that underwent arthroscopy for FAI. Enrollment was between 2020 and 2022. Patients aged 14-45 years were included. Exclusion criteria were previous ipsilateral hip procedures, associated conditions, or high-grade osteoarthritis (Tonnis 2+). Data included demographic, imaging, patient-reported outcomes measurement information system (PROMIS), legacy patient-reported outcome measures (PROM), and surgical. Results: After enrollment, 679 hips were compared to 760 hips from the previous cohort. Mean age was lower at 24.9±7.9 years compared to 29.1± 11.7 years (p<0.001). Female predominance was similar at 56.0% and 54.3%, respectively (p=0.533). BMI was higher at 25.6±5.2 kg/m2 and 24.9±4.5 kg/m2 (p=0.047). Isolated CAMs were higher (72.9% versus 43.0%) and combined FAI was lower (27.1% versus 51.7%) (p<0.001). More patients had symptoms <1 year (41.1% versus 33.6%, p<0.001). Pain was more common laterally (64.2% versus 28.5%), posteriorly (36.5% versus 13.1%), and anteriorly on the thigh (25.2% versus 2.9%) (p<0.001). PROMIS for physical function, pain, mobility, depression, and anxiety were 42.1±7.0, 60.0±5.8, 42.9±7.2, 48.3±9.6, and 51.7±10.2, respectively. For legacy PROMs, the new cohort had better mHHS and HOOS ADL and QoL and worse HOOS symptoms and SF-12 mental component (p<0.05). HOOS pain and sports were similar (p>0.05). There was less osteoarthritis (grade 1: 16.2% versus 53.3%), higher alpha angles (68.8° versus 62.5°), and lower lateral center-edge angles (28.6° versus 29.9°) (p<0.05). There were more labral repairs (93.1% versus 54.1%), less acetabular chondroplasties (45.4% versus 57.5%), and less microfractures (3.8% versus 8.7%) (p-values<0.001). Conclusion: There were key differences between the contemporary and historical groups that may represent temporal changes between generations. Understanding these differences will help provide better care for FAI patients. This study will serve as the baseline for future follow-up studies.

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