Self-reported allergies correlate with a worse patient-reported outcome after hip arthroscopy: a matched control study

Patient-reported outcome measures (PROMs) in patients with and without at least one self-reported allergy undergoing hip arthroscopy were compared. Data on 1434 cases were retrospectively reviewed, and 267 patients were identified with at least one self-reported allergy and randomly matched to a control group on a 1:2 ratio. Four PROMs [Modified Harris Hip Score (mHHS), Hip Outcome Score-Activities of Daily Living (HOS-ADL), Hip Outcome Score-Sports (HOS-Sport) and 33-item International Hip Outcome Tool (iHOT-33)] were collected preoperatively, and at 5-11, 12-23 and 24-35 months postoperatively. Significant PROM differences were found 5-11 months postoperative on mHHS (P < 0.001), HOS-ADL (P = 0.002), HOS-Sport (P < 0.001) and iHOT-33 (P < 0.001). At 12-23 months postoperative, the allergy cohort had significantly worse scores on mHHS (P = 0.002), HOS-ADL (P = 0.001), HOS-Sport (P < 0.001) and iHOT-33 (P < 0.001). They also had significantly worse measures 24-35 months postoperative on mHHS (P = 0.019), HOS-Sport (P = 0.006) and iHOT-33 (P < 0.001). Multivariable logistic regression showed that each additional allergy reported significantly increased the risk of failing to meet the minimal clinically important difference 5-11 months after surgery on mHHS by 1.15 [OR (95% CI): 1.15 (1.03, 1.30), P = 0.014], on HOS-ADL by 1.16 [OR (95% CI): 1.16 (1.02, 1.31), P = 0.021] and on iHOT-33 by 1.20 [OR (95% CI): 1.20 (1.07, 1.36), P = 0.002]. Results suggest self-reported allergies increase the likelihood of a patient-perceived worse outcome after hip arthroscopy. An understanding of this association by the physician is essential during presurgical planning and in the management of postoperative care.