Quality of total hip arthroplasty health care based on four years of patient-reported outcomes in the Netherlands

BACKGROUND: Joint arthroplasty registries have incorporated patient-reported outcomes (PROs) to evaluate outcomes from a patients’ perspective to improve total hip arthroplasty (THA). To draw valid conclusions on PROs, a minimum response rate (RR) of 60% is advised. This study investigated (1) if the quality of THA health care based on PROs improved over the years in the Netherlands, (2) if RRs improved over the years, and (3) difference in PROs over the years in hospitals with RR ≥ 60% compared to RR < 60%. METHODS: Longitudinal study with publicly available datasets from 2016 to 2019. Primary outcome was increase/decrease in PRO change scores including 95%CI ranges over the years between preoperatively and 3 months postoperatively (pre-3 m), and 12 months postoperatively (pre-12 m). Improved quality of health care was arbitrary defined as when ≥ 3 of 4 included scores or ranges were statistically significant improved. Secondary outcome was increase/decrease in RRs over the years. Subgroups RR ≥ 60% and RR < 60% were compared. RESULTS: Hospitals (%) collecting THA PROs increased from 78 to 92%. EQ VAS change score increased over the years, and 95%CI ranges of EQ VAS, EQ-5D descriptive system and NRS pain during activity decreased over the years at pre-3 m (p < 0.05). All THA pre-12 m PRO change scores and 95%CI ranges remained equal (p > 0.05). Pre-3 m RR remained equal (around 43%, p = 0.107) and pre-12 m RR decreased 9% (49% to 40%, p = 0.008). Pre-3 m subgroup RR ≥ 60% was too small to analyse (5%). No difference was found between pre-12 m subgroups (RR ≥ 60% = 16%), p > 0.05). CONCLUSIONS: Quality of THA health care based on PROs seems equal in the Netherlands between 2016 and 2019. Although more hospitals participated in PRO collection, low RRs with large IQRs are observed and only 16% of the hospitals achieved the advised RR ≥ 60%. Multiple recommendations are provided to improve PRO collection and use.