Soft tissue injury is present in hip dysplasia, and pathology of the iliopsoas muscle has been found in 18-50%. The muscles acting close to the hip joint including the deep fibers of the iliopsoas and the iliocapsularis muscle are together with the acetabular labrum and joint capsule able to increase the dynamic stabilisation of the femoral head in the dysplastic and shallow acetabulum. The hip joint is beside the iliopsoas further stabilised by the adductors and the gluteus medius muscle. Sustained hip pain and immobilisation has a negative impact on the iliopsoas, psoas and the hip adductors in terms of atrophy and decreased hip muscle strength. In an experimental study design it was found that decreased force contribution from the gluteal muscles during hip extension and the iliopsoas muscle during hip flexion resulted in an increase in the anterior hip joint force. The increased anterior hip joint force may contribute to anterior hip pain, subtle hip instability and the development of anterior acetabular labral tears.