Table 1.

Pilot RCT design and characteristics

RCT acronym	UK FASHIoN
Type	Feasibility
Clinical centers	10
Sample size	60 patient approaches
Interventions	Hip arthroscopy vs. best conservative care
Specialities involved	Surgery and physiotherapy
Primary recruiters	Surgeons, nurses, and research associates
Inclusion criteria	•Age ≥16 •Symptoms of hip pain •Radiographic evidence of femoroacetabular impingement (FAI) on plain radiographs and cross-sectional imaging •Treating surgeon believed they would benefit from hip arthroscopic surgery •Ability to give written informed consent •Ability to participate fully in the interventions
Exclusion criteria	•Previous significant hip pathology •Existing osteoarthritis •Previous FAI surgery

Abbreviation: RCT, randomized controlled trial.