Trajectory of clinical outcomes following hip arthroscopy in female subgroup populations.

To describe the recovery trajectory in a group of relatively older borderline dysplastic female femoroacetabular impingement syndrome (FAIS) patients following arthroscopic surgery, to determine if outcomes in this group differs from females with different age and bony morphology characteristics. Four subgroups were created to define (i) older females (>35 years), borderline dysplastic (lateral center edge angle [LCEA] ≤ 25 degrees) and anterior wall index (AWI) deficient (AWI ≤ 0.40) (older, borderline dysplastic, anterior wall deficient [ODD, reference]); (ii) younger (≤35 years), borderline dysplastic (LCEA ≤ 25 degrees) and deficient anterior wall (AWI ≤ 0.40) (younger, borderline dysplastic, anterior wall deficient [YDD]); (iii) older (>35 years), non-dysplastic (LCEA > 25 degrees) and non-deficient anterior wall (AWI > 0.40) (older, non-dysplastic, non-deficient anterior wall [ONN]); and (iv) younger (≤35 years), non-dysplastic (LCEA > 25 degrees) and non-deficient anterior wall (AWI > 0.40) (younger, non-dysplastic, non-deficient anterior wall [YNN]). One hundred and seventy-three female patients were included. Comparing mean scores, the ODD group reported significantly lower International Hip Outcome Tool (iHOT-12) change scores compared with the ONN group [23.58 ± 9.73; = 0.03] at 12 months. ODD group also demonstrated significantly lower iHOT-12 change scores compared with the ONN (27.62 ± 8.22; < 0.01) and YNN (25.39 ± 7.68; < 0.01) groups at 24 months. Relatively older females with borderline dysplasia and anterior acetabular wall deficiencies had poorer iHOT-12 outcomes at both 12 and 24 months post-operatively compared with other female subgroups. In the absence of hip dysplasia and anterior wall deficiencies, superior iHOT-12 outcomes were observed in both older and younger females post-operatively.