Targeted Exercise and Changes in Femoroacetabular Impingement in Symptomatic Patients With Acetabular Retroversion

Inclusion Criteria: * Diagnosed from a standard standing anterior-posterior pelvic radiograph with acetabular retroversion due to cross-over-sign and posterior-wall-sign * Not eligible for Ganz osteotomy * Ability to take part in the intervention Exclusion Criteria: * Having a Pelvic Tilt Ratio greater than 0.5, (the height of the obturator foramen divided by the height of the lesser pelvis) indicating posterior pelvic tilt, assessed from a standard standing AP-pelvic radiograph * Radiographic sign of hip osteoarthritis (\< 2mm. joint space), * Previous lumbar, pelvic or hip related operations * Conditions not allowing exercise therapy * Body mass index (BMI) above 35 * Not understanding spoken and/or written Danish language