Patients with a diagnosis of FAIS will be recruited from 2 clinical centers and will receive exercise therapy (study intervention). Exercise therapy is a semi-standardized intervention and will last 12 weeks (3 months). Hip pain, function and quality of life will be assessed using a patient-reported questionnaire at baseline, 3, 6 and 12 months' follow-up. Hip joint contact pressure will be evaluated using motion analysis and modelling at baseline, 3 and 12 months' follow-up. Hip morphology will be evaluated using imaging at baseline and hip surgery rate will be evaluated at 6 and 12 months' follow-up.
The aim of the clinical trial is to investigate the characteristics of patients, who respond vs. not respond to exercise therapy for the nonsurgical management of femoroacetabular impingement syndrome (FAIS).