• 16 - 50 years of age at time of surgery

• Diagnosis of FAI (cam, pincer, mixed) based on the 2016 Warwick Agreement. All 3 criteria below must be met:

‣ Symptoms of motion- or position-related pain in the hip or groin

⁃ Clinical signs consistent with FAI such as: decreased hip flexion and internal rotation, or positive impingement sign

⁃ Radiographic evidence (on BOTH x-ray AND non-contrast MRI) of intra-articular pathology consistent with FAI as determined by the treating surgeon.

• Failed conservative interventions of at least 3 months (i.e. physiotherapy)

• Have symptom relief with intra-articular injection of local anaesthetic

• Unilateral or bilateral surgical intervention (note: unilateral required to ensure the weight bearing guidelines are followed)

• Are willing to be followed for 12 months post-operative.

∙ Eligibility for 'return to sport' cohort:

∙ Additional assessment measures related to return to sport will be collected on the patient who meet the following criteria:

• are or were previously actively involved in sport as indicated by a pre-operative Hip Sports Activity Scale score of four of greater

• indicate a post-operative goal to return to sport following their procedure