Inclusion Criteria:  Age ≥ 18 years General anasthesia Elective periacetabular osteotomy for any reason Written informed consent as documented by signature (Appendix Informed Consent Form) Competent German language skills  Exclusion Criteria:  Chronic pain patient, chronic lower back pain Steroid or immunosuppressive drugs used within 6 months of surgery Renal failure, hepatic failure Relevant allergies Pregnancy/ Breast feeding Contraindications for Fortecortin treatment according to Swissmedic Previous enrollment into the current study Participation in another study with investigational drug within the 30 days preceding and during the present study Known or suspected non-compliance, drug or alcohol abuse Illness according to "Warnings and Precautions of Dexamethasone and NaCl"