• Nathaniel W Jenkins, James M Parrish, Shruthi Mohan, Cara E Geoghegan, Caroline N Jadczak, Nadia M Hrynewycz, and Kern Singh.
• Department of Orthopaedic Surgery, Rush University Medical Center, 1611 W. Harrison St. Suite #300, Chicago, IL, 60612, USA.
• Eur Spine J. 2020 Sep 1; 29 (9): 2222-2230.

PurposeTo determine whether there is an association between preoperative 10-Item Patient Activation Measure (PAM-10) scores and clinical outcomes following MIS LD.MethodsPatients undergoing a primary MIS LD were retrospectively reviewed and stratified according to their preoperative PAM-10 scores: "low PAM," "moderate PAM," and "high PAM." Preoperative PAM score cohorts were tested for improvements in Oswestry Disability Index (ODI), 12-Item Short-Form Physical Component Score (SF-12 PCS), and Visual Analog Scale (VAS) back and leg pain using multivariate linear regression.ResultsEighty-nine patients were included: 29 had a low PAM score, 32 had a moderate PAM score, and 28 had a high PAM score. Cohorts experienced similar preoperative VAS back pain, VAS leg pain, ODI, and SF-12 PCS. Patients with low PAM scores experienced a trend of higher pain scores throughout 6 months with VAS back pain being significant at 3 months and VAS leg pain being significant at 6-week and 3-month follow-up. Patients with lower PAM scores experienced a worse improvement in ODI at 6-week, 3-month, and 6-month timepoints. Lastly, patients with lower PAM scores demonstrated less improvement in SF-12 PCS at 3-month and 6-month follow-up.ConclusionsLower preoperative PAM scores were associated with worse improvement in clinical outcomes following MIS LD. Patients with lower PAM scores had diminished improvement in long-term patient-reported outcomes including ODI, SF-12, and VAS back and leg pain. Our investigation suggests that preoperative PAM assessments may be an effective tool to predict postoperative outcomes following MIS LD.

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