Early insights from the routine use of patient reported outcome measures in elective hip and knee arthroplasty at a public teaching hospital in South Australia.

Introduction: For advanced osteoarthritis of the knee and hip, the most clinically effective treatment remains total-knee arthroplasty (TKA) and total-hip arthroplasty (THA). Success of these surgeries have traditionally been appraised by economic and volume-based measures. There has been a shift towards the use of patient reported outcome measures (PROMs) to quantify success and guide treatment. The present study provides analysis of three PROMS which have been validated for use in orthopaedic settings; the Oxford Knee Score (OKS), Oxford Hip Score (OHS), Forgotten Joint Score (FJS), and the EuroQol-Visual Analogue Scale (EQ-VAS) - a non-disease specific measure of health. PROMs were completed pre-operatively, 6-weeks, and 1-year after elective TKA and THA undertaken in 2018 in a public teaching hospital in South Australia. Post-operative satisfaction/dissatisfaction was measured using a 5-point Likert scale and was collected at the same 6-week and 1-year points.

Results: PROMs were collected from 285 eligible elective knee-arthroplasty, and 205 elective hip-arthroplasty patients. There was significant average improvement, greater than minimal clinical important differences between pre-operative and 1-year post-operative scores for all three PROMs tools. Inter-PROM correlation was strongest between FJS and OKS at 1-year post TKA (r_s = 0.722), and between FJS and OHS in post-THA at the same interval (r_s = 0.609). TKA patients with higher pre-surgical 10-year mortality were weakly associated with lower pre-operative OKS score (r_s = 0.169). BMI was weakly negatively associated with pre-operative and 6-week post-operative EQ-VAS scores (r_s = -0.291 and r_s = -0.149 respectively). Post-TKA satisfaction was 77.2% at 1-year, and THA 88.5% at the same interval.

Conclusion: This study provides an early insight from the use of the OKS, OHS, the EQ-VAS and the FJS as PROMs in primary TKA and THA at our centre. All PROMs demonstrate significant increase (improvement) at both 6-week and 1-year post-operative intervals, relative to pre-operative scores. The FJS demonstrated good sensitivity. Pre-existing co-morbidities do not appear to have any significant relation with post-operative PROMs collected in this study.