Patient expectations impact patient-reported outcomes and satisfaction after lumbar fusion

Background context Prior studies suggest that patient expectations impact postoperative Patient-reported Outcomes (PROMs). However, no consensus exists on an appropriate expectations tool. Purpose To examine the impact of patient expectations using a modified version of the Oswestry Disability Index (ODI) on clinical outcomes and patient satisfaction at one year after lumbar fusion for degenerative pathologies. Study Design Prospective longitudinal cohort Patient sample Adults undergoing 1-2 level lumbar fusion were identified from four tertiaty spine centers. Outcome measures ODI, EuroQol-5D, Numeric rating scales for back and leg pain. Methods Preoperatively, patients completed the ODI, as well as a modified ODI reflecting their expected improvement across the 10 ODI items. For example, item 1 in the ODI asks about Pain Intensity at the moment whereas the Expectations ODI asks “One year after surgery, I expect to have…” The difference between this modified ODI score and the baseline ODI score (Baseine ODI minus Expectations ODI) was defined as the Patient Expectation Score. Patients were stratified into tertiles based on their Expectations score into High (HE), Moderate (ME) and Low (LE) Expectations and compared. Results There were 30 patients in the HE, 35 in the ME and 26 in the LE Group, with similar demographics and surgical parameters. Patients in the HE group had worse ODI scores pre-operatively (54.96 vs 41.42, p<0.001) and were expecting a greater improvement in ODI (43.8 vs 13.5, p<0.001). There were fewer patients in the HE group (13, 43%) who reported that they were satisfied with the results of compared to either the ME (20, 71%) LE group (22, 85%, p=0.041) despite having similar ODI scores and change in ODI scores one year post-operatively. Conclusion An expectations tool, linked to a disease-specific measure may provide the clinician with a practical method of assessing a patient's expectation of results after treatment and aid in the shared decision making during the pre-operative surgical process.