EP8.14 Hip arthroscopy results in favourable short and mid-term patient-reported outcome measures in patients with femoroacetabular impingement – A study utilising the UK Non-Arthroplasty Hip Registry (NAHR) database

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ID: 331158
2026
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Abstract
Abstract Purpose This study aimed to assess patient-reported outcome-measures (PROMs) after hip arthroscopy (HA) in patients with femoroacetabular impingement (FAI) utilising data from the UK Non-Arthroplasty Hip Registry (NAHR). Methods All HAs performed for FAI recorded in the UK NAHR up to November 2025 were identified. Exclusions included revision procedures, procedures with concomitant osteotomy and those without available baseline and at least one follow-up PROM score. iHOT-12, EQ-5D Index and EQ-5D Visual Analogue Scale (VAS) scores were captured pre-operatively and at 6- and 12-months post-operatively. Minimal clinically-important difference (MCID) was assessed for each score based on previous values obtained from NAHR data (iHOT-12 ≥9, EQ-5D VAS ≥11, EQ-5D Index ≥0.12) and substantial clinical benefit (SCB) was assessed for iHOT-12 using ≥28. PROMs were compared between subtypes using unadjusted and adjusted methods, adjusting for age, sex, BMI, femoral Outerbridge score and the presence of acetabular cartilage damage. Results 7782 HAs were identified of which 63.5% (n=4943) were cam lesions, 29.1% (n=2263) were mixed lesions and 7.4% (n=576) were pincer lesions. No significant difference in age (34-35y) or BMI (24.5-25.2) between groups was observed (p>0.05 for both). Males comprised a significantly lesser proportion of pincer patients (21.9%, n=126) compared with cam (47.2%, n=2339) and mixed (51.1%, n=1156) patients. Proportions of patients with acetabular cartilage damage were 84.9% for cam (n=3511), 87.3% for mixed (n=1594) and 78.6% for pincer (n=337) (p<0.0001). A significantly greater proportion of cam patients demonstrated Outerbridge grade 0 femoral cartilage at the time of operation (52.6%, n=2600) compared with mixed (42.6%, n=963) and pincer (44.8%, n=258) patients (p<0.0001). All subtypes improved significantly from baseline to 6 months and baseline to 12 months across all PROMS (all p<0.012). On unadjusted analysis, pincer patients experienced significantly poorer iHOT-12 scores compared to cam and mixed patients at all timepoints (all p<0.011). Pincer patients also experienced poorer baseline EQ-5D Index scores compared to cam and mixed patients on unadjusted analysis (p<0.08 for both). On adjusted analysis, non-significant trends were identified between mixed and pincer patients in baseline iHOT-12 (4.1 [SE 1.9], p=0.0770) and between cam and pincer patients at 12 months (0.031 [SE 0.015], p=0.0949). The proportion of patients achieving MCID for iHOT-12, EQ-5D VAS and EQ-5D Index were 71.4-72.0%, 18.1-18.5% and 49.4-51.5% respectively. No significant differences between subtypes was observed (p>0.05 for all). No significant differences were observed between subtypes for SCB for iHOT-12 (p>0.05). Conclusion HA for FAI results in significant improvement from baseline at 6- and 12-months across all FAI subtypes. Our results suggest that differences in absolute PROM scores between subtypes may be due to case-mix characteristics as opposed to FAI morphology, as demonstrated in adjusted analysis. The majority of patients achieve MCID for iHOT-12 at 6 and 12 months.
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Authors William Cawley, Richard Holleyman, Antonio Andrade, Vikas Khanduja, The Nahr Board, Marcus Bankes, Callum McBryde, Ajay Malviya
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.395
URL
https://doi.org/10.1093/jhps/hnag043.395
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