The HIP Self-management Study

The HIPS-study will be an observer blinded, single-centre, parallel-group randomized controlled trial (RCT). The main purpose of the study is: 1. To investigate the clinical effectiveness of a self- management program versus usual care for patients with greater trochanteric pain syndrome (GTPS). * H0: There is no difference between a self-management program and usual care on pain and function in patients with GTPS. * H1: There is a difference between a self-management program and usual care on pain and function in patients with GTPS. 2. To investigate if self-management is more cost-effective than usual care in the treatment of patients with GTPS. Participants will be randomly allocated into one of two groups: 1) self-management program or 2) usual care. Follow-up will be at 3-, 6- and 12-months.

Inclusion Criteria: * Participants between 18 and 70 years of age * History of lateral hip pain \> 3 months * Reported average pain intensity the last week ≥ 3 on a numeric rating scale * Lateral hip pain is the main complaint * Pain on palpation of the greater trochanter region * In addition, lateral hip pain on at least one of the following tests: * Single leg stance test: standing 30 seconds on the affected leg * FADER: passive stretch/compression of gluteus medius/minimus * FADER-R: static muscle test with resistance to internal hip rotation * ADD: passive stretch to hip adduction in sidelying * ADD-R: resisted hip abduction in sidelying * FABER (Patrick's) test A positive test is defined as a spontaneous reproduction of the participant's lateral hip pain. In participants with bilateral lateral hip pain, the worst hip will be included, and the presence of bilateral pain will be documented. Exclusion Criteria: * Significant back pain causing referred pain to the lateral hip * Clinical signs of radiculopathy * Symptomatic osteoarthritis * Other hip joint pathologies * History of trauma or surgery on the affected side * Pregnancy or post-partum pelvic pain (under 12 months since birth) * Active cancer * Not able to write, read, and comprehend Norwegian (without the use of an interpreter)