Parameters affecting baseline hip function in patients with cam-derived femoroacetabular impingement syndrome: data analysis from the German Cartilage Registry

Background: Using the database of the German Cartilage Registry (KnorpelRegister DGOU), this study aims to present patient- and joint-related baseline data in a large cohort of patients with cam-derived femoroacetabular impingement syndrome (FAI) and to detect symptom-determining factors. Materials and methods: Requiring cam morphology as the primary pathology, 362 patients were found to be eligible for inclusion in the study. The assessment of preoperative baseline data was performed using the patient-reported outcome measure-International Hip Outcome Tool (iHOT-33). Descriptive statistics were performed to present baseline data. Univariate and multiple regression with post hoc testing were used to identify patient- and joint-related factors that might affect the preoperative iHOT-33 and its subscores, respectively. Results: The study collective's mean age was 36.71 +/- 10.89 years, with 246 (68%) of them being male. The preoperative mean iHOT-33 total was 46.31 +/- 20.33 with the subsection sports and recreational activities presenting the strongest decline (26.49 +/- 20.68). The parameters age, sex, body mass index (BMI), and the confirmation of previous surgery on the affected hip were identified to statistically affect the preoperative iHOT-33. In fact, a significantly lower mean baseline score was found in patients aged > 40 years (p < 0.001), female sex (p < 0.001), BMI >= 25 kg/m(2) (p = 0.002) and in patients with previous surgery on the affected hip (p = 0.022). In contrast, the parameters defect grade and size, labral tears, and symptom duration delivered no significant results. Conclusions: A distinct reduction in the baseline iHOT-33, with mean total scores being more than halved, was revealed. The parameters age > 40 years, female sex, BMI >= 25, and confirmation of previous surgery on the affected hip were detected as significantly associated with decreased preoperative iHOT-33 scores. These results help to identify symptom-defining baseline characteristics of cam-derived FAI syndrome.

Automated summary

This study analyzed patient- and joint-related baseline data of a large cohort of patients with cam-derived femoroacetabular impingement syndrome using the German Cartilage Registry. Factors such as age, sex, body mass index (BMI), and previous hip surgery confirmation were identified to significantly affect preoperative iHOT-33 scores.