New study aims to end guesswork in hip impingement treatment

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Voluntary written informed consent of the participant or their legally authorized representative has been obtained prior to any screening procedures 2. Male or Female, Age 18-35 years inclusive. 3. First consultation at participating site with clinical diagnosis of FAIS by a hip orthopaedic surgeon, including positive impingement tests and reduced hip ROM in the transverse plane compatible with FAIS. 4. Radiographic cam and/or pincer morphology on standard imaging (e.g. α-angle \>60°, lateral center-edge angle \>40°, crossover sign) as per local protocol. 5. Willingness and ability to participate rehabilitation and complete the recommended physiotherapy sessions and attend scheduled follow-up visits. 6. Ability to perform basic squat / hip-hinge tasks safely in the motion lab, as judged by the treating clinician. Exclusion Criteria: 1. Previous surgery on the bilareral hip. 2. History of major hip trauma or pediatric hip disease (e.g. Slipped capital femoral epiphysis, Perthes disease). 3. Developmental dysplasia (lateral center-edge ≤20°) or other severe structural deformity incompatible with the standard FAIS pathway. 4. Radiographic signs of hip degeneration (Tönnis grade \>2). 5. Other musculoskeletal conditions that significantly interfere with assessments (e.g. symptomatic lumbar disc disease, severe knee pathology, recent adductor muscle pathology). 6. Contraindications to MRI (e.g. non-MRI compatible pacemaker or implant, severe claustrophobia not manageable with standard care). 7. Contraindications to X-ray or MRI related to pregnancy: known pregnancy at any time, or positive pregnancy test prior to imaging; breastfeeding women will not undergo additional research imaging. 8. Inability to perform basic squat/hip-hinge tasks safely (e.g. due to balance, pain or cardiopulmonary limitations).