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Introduction: Low back pain (LBP) is a common cause of impaired quality of life and disability and studies regarding surgical management of patients with LBP show a high variation in patient-reported success rate. Research question: To find valuable preoperative clinical risk factors and variables associated with a non-satisfactory patient-reported outcome following surgery. Materials and methods: The Danish surgical spine database (DaneSpine) was used to collect eight years of pre- and postoperative data on patients undergoing single-level fusions with either posterior- (PLIF) or transforaminal lumbar interbody fusions (TLIF). The primary outcome was patient nonsatisfaction. We collected data on European Quality of Life–5 Dimensions (EQ-5D), visual analogue scale (VAS), Oswestry Disability Index (ODI) score, pain intensity, duration of back pain, previous discectomy, and expectations regarding return to work after surgery at 2-year follow-up. Results: The cohort included 453 patients of which 19% reported treatment nonsatisfaction. The nonsatisfaction group demonstrated higher preoperative VAS scores for back pain (75 ± 19 vs. 68 ± 21, p = 0.006) and leg pain (65 ± 25 vs. 58 ± 28, p = 0.004). The preoperative EQ-5D score was significantly lower in the nonsatisfaction group (0.203 + 0.262 vs. 0.291 ± 0.312, p = 0.016). There was no statistical significance between patient nonsatisfaction and preoperative ODI score, age, body mass index, duration of back pain or expectations regarding return to work after surgery. Discussion and conclusion: Low preoperative EQ-5D scores and high VAS leg and back pain scores were statistically significant with patient nonsatisfaction following surgery and may prove to be valuable tools in the preoperative screening and alignment of patient expectations.