Weightbearing Restrictions on Postoperative Outcomes Following Arthroscopic Surgery for FAI

Inclusion Criteria:

• 16 - 50 years of age at time of surgery
• Diagnosis of FAI (cam, pincer, mixed) based on the 2016 Warwick Agreement. All 3criteria below must be met:

1. Symptoms of motion- or position-related pain in the hip or groin
2. Clinical signs consistent with FAI such as: decreased hip flexion and internalrotation, or positive impingement sign
3. Radiographic evidence (on BOTH x-ray AND non-contrast MRI) of intra-articularpathology 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 theweight 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 patientwho meet the following criteria:
• are or were previously actively involved in sport as indicated by a pre-operative HipSports Activity Scale score of four of greater
• indicate a post-operative goal to return to sport following their procedure

Exclusion Criteria: Clinical:

• Previous surgery on the affected hip, or other major lower extremity orthopaedicsurgery
• Active joint or systemic infection, significant muscle paralysis, significant lowerextremity or medical comorbidity that could alter the effectiveness of the surgicalintervention (e.g. polymyalgia rheumatica)
• Unable to speak or read English/French
• Unable or unwilling to be followed for 1 year or complete functional testing
• Presence of chronic pain syndromes
• History of pediatric hip disease (i.e. Slipped Capital Femoral Epiphysis,Legg-Calve-Perthes Disease)
• Ongoing litigation or compensation claims related to the hip (including Workers'Compensation) Radiographic:
• Osteoarthritis greater than Tönnis Grade 1 on affected hip
• Lateral central edge angle <19°
• Dysplasia in patients with broken Shenton line (i.e. Severe acetabular deformitypresent)