Inclusion Criteria:  Scheduled for a single level PLIA as treatment of mono segmental degenerative instability, as seen on dynamic X-rays, after the failure of 6 months conservative therapy Capable of understanding the provided information Giving informed consent  Exclusion Criteria:  Revision surgery Arthrodesis for trauma, neoplasms, infection, or listhesis due to lysis. High dose opioid use (step 3 of the WHO pain ladder) Diabetes Cognitive impairment (baseline dementia, cognitive dysfunction, or inability to consent to participate).  Known kidney insufficiency: GFR <30 mL/min/1.73 m2 Allergy/intolerance/contraindication to any medication or component included in the ERAS pathway protocol Patients with a risk factor for reflux