{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,29]],"date-time":"2026-10-29T18:15:30Z","timestamp":1793297730831,"version":"4.5.0"},"reference-count":25,"publisher":"The Korean Spinal Neurosurgery Society","issue":"2","license":[{"start":{"date-parts":[[2026,4,30]],"date-time":"2026-04-30T00:00:00Z","timestamp":1777507200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/3.0\/"}],"content-domain":{"domain":["e-neurospine.org"],"crossmark-restriction":true},"short-container-title":["NS"],"published-print":{"date-parts":[[2026,4,30]]},"abstract":"<jats:p>Objective: To longitudinally analyze smartphone-based real-life activity data and compare it with established clinical outcome measures in patients undergoing lumbar spine surgery for sciatica, focusing on identifying divergence in recovery trajectories.Methods: Fifty patients were assessed preoperatively and at 6 weeks (6W), 3 months (3M), and 6 months (6M). Outcomes included smartphone-derived daily Step Count, objective capacity (6-minute walking test [6WT]), and subjective disability (visual analogue scale [VAS] leg\/back, Core Outcome Measures Index [COMI] back, and Oswestry Disability Index [ODI]). All metrics were standardized into z-scores relative to baseline. Piecewise linear mixed-effects (LME) models compared recovery slopes across 2 segments: phase I (early: 0\u20136 weeks) and phase II (late: 6 weeks\u20136 months).Results: The cohort (mean age, 50.7 years; 24 females) included 33 patients with lumbar disc herniation and 17 with lateral recess stenosis. All measures improved significantly during phase I (all p&lt;0.05). However, LME modeling revealed a significant interaction between time segment and measurement type in phase II. Daily Step Count was the only metric maintaining a significant, linear upward recovery slope during the late phase (\u03b2=0.31 Z\/mo). Conversely, slopes for 6WT, ODI, and COMI were significantly flatter (p&lt;0.001 vs. Step Count), indicating a statistical plateau or \u201cceiling effect.\u201d Spearman correlations between Step Count and traditional metrics weakened from strong at baseline to weak at 6 months.Conclusion: Smartphone-derived real-life activity data detect continuous functional improvement up 6 months postoperatively, whereas conventional objective and subjective measures plateau by 6 weeks. Real-world activity monitoring provides a more sensitive assessment of long-term surgical success.<\/jats:p>","DOI":"10.14245\/ns.2551798.899","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T00:07:03Z","timestamp":1777421223000},"page":"229-238","update-policy":"https:\/\/doi.org\/10.14245\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Physical Performance Continues to Improve After Surgery for Sciatica, Exceeding Recovery Periods of Physical Capacity and Patient-Reported Outcomes: Multicenter Prospective Observational Study"],"prefix":"10.14245","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8071-246X","authenticated-orcid":true,"given":"Michal","family":"Ziga","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Cantonal Hospital Lucerne, Lucerne, Switzerland"},{"name":"Faculty of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland"},{"name":"Department of Neurosurgery, Cantonal Hospital St. Gallen, H-OCH Health Ostschweiz, Medical School, University of St. Gallen, St. Gallen, Switzerland"},{"name":"Department of Neurosurgery and Neurooncology, First Faculty of Medicine, Charles University in Prague, Prague, Czech Republic"},{"name":"First Faculty of Medicine, Charles University in Prague, Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-3146-4646","authenticated-orcid":true,"given":"Linda","family":"B\u00e4ttig","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Cantonal Hospital St. Gallen, H-OCH Health Ostschweiz, Medical School, University of St. Gallen, St. Gallen, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-3872-9805","authenticated-orcid":true,"given":"Raphael","family":"Gmeiner","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Medical University 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