Evaluation of the new questionnaire "Forgotten Joint Score" in total hip arthrosplasty with use of "Oxford Hip Score" as reference standard

Abstract

Evaluation of the new questionnaire ‘Forgotten Joint Score’ in total hip arthroplasty with use of ‘Oxford Hip Score’ as reference standard Amanda Larsson, Degree project in Medicine, 2017, Department of Orthopaedics, Mölndal Hospital, Sweden. Supervisor: Johan Kärrholm INTRODUCTION Total hip arthroplasty (THA) is performed mainly because of pain in the hip joint. To evaluate the result after surgery, different questionnaires measuring the patient-reported outcome regarding quality of life are used. Forgotten Joint Score (FJS) is a questionnaire that was developed to find subtle differences between patients who report that their operated hip is “very good” or “excellent”. The total score ranges from 0-100, where a high score is the best outcome. Oxford Hip Score (OHS) is a well-established tool to evaluate THA in clinical practice and scientific evaluations. This instrument ranges from 0-48, and focuses mainly on the pain from the artificial hip joint. AIM The aim of this study is to evaluate a new questionnaire called Forgotten Joint Score (FJS) to examine the reliability and assess whether it provides more information compared to already existing questionnaires; Oxford Hip Score (OHS) and EQ-5D-5L, regarding clinical results after hip prosthesis surgery. METHOD 200 patients who underwent unilateral total hip arthroplasty in 2015 were included. The participants answered three questionnaires: Forgotten Joint Score, Oxford Hip Score and EQ- 5D-5L. RESULT OHS ceiling effect (30.5 %) was higher compared to FJS (18.1%). Test-retest of the FJS revealed a good or excellent internal consistency (Cronbach’s a = 0.91). 20.7% of the patients had identical answers on both FJS questionnaires. The ceiling effect for EQ-5D was 37.5 % and 2 patients achieved a negative score. CONCLUSION OHS had a greater risk for ceiling effects, which could indicate that FJS is a more fine-tuned instrument to separate patients with good to excellent outcome after THA. The FJS has a good internal consistency.