Abstract
BackgroundThe International Hip Outcome Tool 12 (iHOT-12) is a shorter version of the iHOT-33 which measures health related quality of life following treatment of hip disorders in young, active patients. The purpose of this study was identify a PASS threshold for a UK population undergoing hip arthroscopy for intra-articular hip pathology.MethodsData was identified retrospectively from a prospective database of patients undergoing hip arthroscopy under the care of a single surgeon within the date range January 2013 to March 2017. All patients with a diagnosis of femoroacetabular impingment (FAI) undergoing arthroscopic treatment were included. iHOT-12, EuroQol 5D-5 L (EQ-5D-5 L) and a satisfaction questionnaire were available pre and post-operatively. PASS was calculated using an anchor-based approach and receiver operator characteristic (ROC) analysis.Results171 patients underwent hip arthroscopy in the study period. Linked longitudinal follow-up data was available for 122 patients (71.3%) at a median of 24.3 months (740 days, interquartile range 576–1047). The PASS threshold for the iHOT-12 was 59.5 (sensitivity 81.1%, specificity 83.9%; area under the curve (AUC) 0.92, 95% CI 0.87–0.97). 64% of patients achieved this score. The median postoperative iHOT-12 score was 72.5 (IQR 44) and the mean change in score was 35 (SD 25, p < 0.001). The EQ-5D Index improved by 0.18 (SD 0.25, p < 0.001) and there was a mean change of 7.67 (SD 24.82) on the EQ-5D VAS (p = 0.001).ConclusionsWe report a PASS threshold of the iHOT-12 following hip arthroscopy for FAI as a measurable benchmark for clinicians using this outcome measure.
Highlights
The International Hip Outcome Tool 12 is a shorter version of the International hip outcome tool (iHOT)-33 which measures health related quality of life following treatment of hip disorders in young, active patients
There were no differences in age, gender, pre-op International Hip Outcome Tool 12 (iHOT-12) score or pre-op EQ-5D visual analog scale (VAS) between those who did and did not respond to follow-up questionnaires (Table 2)
Using the method of one half of the standard deviation of the difference in pre and postoperative outcome score to quantify the minimally clinical important difference (MCID), we found this to be 12.54
Summary
The International Hip Outcome Tool 12 (iHOT-12) is a shorter version of the iHOT-33 which measures health related quality of life following treatment of hip disorders in young, active patients. There has been a significant increase in the volume of arthroscopic hip surgery performed in recent years and specific patient reported outcome measures (PROMs) have been developed to measure the success of this intervention [3,4,5,6,7]. This has been important for high functioning, young, active. Two recent systematic reviews have reported the iHOT to be favourable compared to other hip-specific outcome
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