Freyr Gauti Sigmundsson

Articles in journals

• Szigethy, L. , Sigmundsson, F. G. & Joelson, A. (2024). Surgically treated degenerative disk disease in twins. European spine journal, 33 (4), 1381-1384.
• Szigethy, L. , Sigmundsson, F. G. & Joelson, A. (2024). Surgically Treated Degenerative Lumbar Spine Diseases in Twins. Journal of Bone and Joint Surgery. American volume.
• Joelson, A. , Szigethy, L. , Wildeman, P. , Sigmundsson, F. G. & Karlsson, J. (2023). Associations between future health expectations and patient satisfaction after lumbar spine surgery: a longitudinal observational study of 9929 lumbar spine surgery procedures. BMJ Open, 13 (9).
• Nerelius, F. , Sigmundsson, F. G. , Karlén, N. , Wretenberg, P. & Joelson, A. (2023). Patient-reported Outcome after Surgical Evacuation of Postoperative Spinal Epidural Hematomas at One-year Follow-up. Spine.
• Elmose, S. F. , Andersen, M. O. , Sigmundsson, F. G. & Carreon, L. Y. (2023). Response to "letter to the Editor Regarding: Magnetic Resonance Imaging Proxies for Segmental Instability in Degenerative Lumbar Spondylolisthesis Patients". Spine, 48 (13), E221-E221.
• Joelson, A. & Sigmundsson, F. G. (2022). Additional operation rates after surgery for degenerative spine diseases: minimum 10 years follow-up of 4705 patients in the national Swedish spine register. BMJ Open, 12 (12).
• Sigmundsson, F. G. , Joelson, A. & Strömqvist, F. (2022). Additional operations after surgery for lumbar disc prolapse: indications, type of surgery, and long-term follow-up of primary operations performed from 2007 to 2008. The Bone & Joint Journal, 104-B (5), 627-632.
• Elmose, S. F. , Andersen, M. O. , Sigmundsson, F. G. & Carreon, L. Y. (2022). Magnetic Resonance Imaging Proxies for Segmental Instability in Degenerative Lumbar Spondylolisthesis Patients. Spine, 47 (21), 1473-1482.
• Holy, M. , Joelson, A. & Sigmundsson, F. G. (2022). Occult spondylodiscitis after cervical intradiscal injection with radiopaque gelified ethanol, DiscoGel: A case report. Interdisciplinary Neurosurgery, 28.
• Sigmundsson, F. G. , Joelson, A. & Strömqvist, F. (2022). Patients with no preoperative back pain have the best outcome after lumbar disc herniation surgery. European spine journal, 31 (2), 408-413.
• Joelson, A. , Nerelius, F. , Holy, M. & Sigmundsson, F. G. (2022). Reoperations After Decompression With or Without Fusion for L3-4 Spinal Stenosis With Degenerative Spondylolisthesis: A Study of 372 Patients in Swespine, the National Swedish Spine Register. Clinical spine surgery, 35 (3), E389-E393.
• Joelson, A. , Sigmundsson, F. G. & Karlsson, J. (2022). Responsiveness of the SF-36 general health domain: observations from 14883 spine surgery procedures. Quality of Life Research, 31 (2), 589-596.
• Joelson, A. , Strömqvist, F. , Sigmundsson, F. G. & Karlsson, J. (2022). Single item self-rated general health: SF-36 based observations from 16,910 spine surgery procedures. Quality of Life Research, 31 (6), 1819-1828.
• Joelson, A. , Sigmundsson, F. G. & Karlsson, J. (2022). Stability of SF-36 profiles between 2007 and 2016: A study of 27,302 patients surgically treated for lumbar spine diseases. Health and Quality of Life Outcomes, 20 (1).
• Joelson, A. , Nerelius, F. , Sigmundsson, F. G. & Karlsson, J. (2022). The minimal important change for the EQ VAS based on the SF-36 health transition item: observations from 25772 spine surgery procedures. Quality of Life Research, 31 (12), 3459-3466.
• Hareni, N. , Strömqvist, F. , Strömqvist, B. , Sigmundsson, F. G. , Rosengren, B. E. & Karlsson, M. K. (2021). Back pain is also improved by lumbar disc herniation surgery. Acta Orthopaedica, 92 (1), 4-8.
• Holy, M. , MacDowall, A. , Sigmundsson, F. G. & Olerud, C. (2021). Operative treatment of cervical radiculopathy: anterior cervical decompression and fusion compared with posterior foraminotomy. Trials, 22 (1).
• Joelson, A. , Sigmundsson, F. G. & Karlsson, J. (2021). Properties of SF-6D when longitudinal data from 16,398 spine surgery procedures is applied to 9 national SF-6D value sets. Acta Orthopaedica, 92 (5), 532-537.
• Joelson, A. , Sigmundsson, F. G. & Karlsson, J. (2021). Properties of the EQ-5D-3L index distribution when longitudinal data from 27,328 spine surgery procedures are applied to nine national EQ-5D-3L value sets. Quality of Life Research, 30, 1467-1475.
• Joelson, A. , Wildeman, P. , Sigmundsson, F. G. , Rolfson, O. & Karlsson, J. (2021). Properties of the EQ-5D-5L when prospective longitudinal data from 28,902 total hip arthroplasty procedures are applied to different European EQ-5D-5L value sets. The Lancet Regional Health: Europe, 8.
• Joelson, A. , Nerelius, F. , Holy, M. & Sigmundsson, F. G. (2021). Reoperations after decompression with or without fusion for L4-5 spinal stenosis with or without degenerative spondylolisthesis: a study of 6,532 patients in Swespine, the national Swedish spine register. Acta Orthopaedica, 92 (3), 264-268.
• Sigmundsson, F. G. , Möller, A. & Strömqvist, F. (2021). Surgery for Lumbar Spinal Stenosis in Patients With Mild Leg Pain Levels Is Associated With Unsatisfactory Outcome. Global Spine Journal, 11 (8), 1202-1207.
• Sigmundsson, F. G. , Kuchalik, J. , Fadl, S. , Holy, M. & Joelson, A. (2021). The unique challenges of Brugada syndrome in spinal deformity surgery. Interdisciplinary Neurosurgery, 25.
• Thormodsson, H. S. , Ntouniadakis, E. , Holy, M. & Sigmundsson, F. G. (2020). Acute Postoperative Bilateral Vocal Fold Paralysis After Posterior Spinal Correction for Dropped Head Syndrome. World Neurosurgery, 143, 360-364.
• Strömqvist, F. , Sigmundsson, F. G. , Strömqvist, B. , Jönsson, B. & Karlsson, M. K. (2019). Incidental durotomy in degenerative lumbar spine surgery: a register study of 64,431 operations. The spine journal, 19 (4), 624-630.
• Sigmundsson, F. G. , Stromqvist, F. & Karlsson, B. (2019). Pisa-heilkenni – sjúkratilfelli: [Pisa Syndrome - case report]. Laeknabladid: The icelandic medical journal, 105 (5), 231-235.
• Sigmundsson, F. G. , Jönsson, B. & Strömqvist, B. (2017). Determinants of patient satisfaction after surgery for central spinal stenosis without concomitant spondylolisthesis: a register study of 5100 patients. European spine journal, 26 (2), 473-480.
• Sigmundsson, F. G. , Jönsson, B. & Strömqvist, B. (2015). Outcome of decompression with and without fusion in spinal stenosis with degenerative spondylolisthesis in relation to preoperative pain pattern: a register study of 1,624 patients. The spine journal, 15 (4), 638-646.
• Sigmundsson, F. G. (2014). Introduction. Acta Orthopaedica, 85, 3.
• Sigmundsson, F. G. , Jönsson, B. & Strömqvist, B. (2014). Preoperative pain pattern predicts surgical outcome more than type of surgery in patients with central spinal stenosis without concomitant spondylolisthesis: a register study of 9051 patients. Spine, 39 (3), E199-E210.
• Sigmundsson, F. G. , Jönsson, B. & Strömqvist, B. (2013). Impact of pain on function and health related quality of life in lumbar spinal stenosis. A register study of 14,821 patients. Spine, 38 (15), E937-45.
• Sigmundsson, F. G. , Kang, X. P. , Jönsson, B. & Strömqvist, B. (2012). Prognostic factors in lumbar spinal stenosis surgery. Acta Orthopaedica, 83 (5), 536-542.
• Sigmundsson, F. G. , Kang, X. P. , Jönsson, B. & Strömqvist, B. (2011). Correlation between disability and MRI findings in lumbar spinal stenosis: a prospective study of 109 patients operated on by decompression. Acta Orthopaedica, 82 (2), 204-210.
• Sigmundsson, F. G. , Olafsson, A. H. & Ingvarsson, T. (2009). Árangur agera á slitinni fjærsin upphandleggsvöva á FSA 1986-2006 [Repair of distal biceps brachii tendon ruptures: long term retrospective follow-up for two-incision technique]. Laeknabladid: The icelandic medical journal, 95 (1), 19-24.
• Juul, O. , Sigmundsson, F. G. , Ovesen, O. , Andersen, M. O. , Ernst, C. & Thomsen, K. (2006). No difference in health-related quality of life in hip osteoarthritis compared to degenerative lumbar instability at pre- and 1-year postoperatively: a prospective study of 101 patients. Acta Orthopaedica, 77 (5), 748-754.
• Sigmundsson, F. G. , Andersen, P. B. , Schroeder, H. D. & Thomsen, K. (2004). Vertebral osteonecrosis associated with pancreatitis in a woman with pancreas divisum. A case report. Journal of Bone and Joint Surgery. American volume, 86 (11), 2504-2508.

Articles, reviews/surveys

• Elmose, S. F. , Andersen, G. O. , Carreon, L. Y. , Sigmundsson, F. G. & Andersen, M. O. (2023). Radiological Definitions of Sagittal Plane Segmental Instability in the Degenerative Lumbar Spine - A Systematic Review. Global Spine Journal, 13 (2), 523-533.
• Debono, B. , Wainwright, T. W. , Wang, M. Y. , Sigmundsson, F. G. , Yang, M. M. H. , Smid-Nanninga, H. , Bonnal, A. , Le Huec, J. & et al. (2021). Consensus statement for perioperative care in lumbar spinal fusion: Enhanced Recovery After Surgery (ERAS®) Society recommendations. The spine journal, 21 (5), 729-752.

Conference papers

• Sigmundsson, F. G. , Strömqvist, . , Karlsson, . & Hareni, . (2020). Preoperative characteristics and surgical outcome of patients with recurrent lumbar disc herniation and degenerative disc disease.  Paper presented at 49th Annual Meeting of the Japanese Society for Spine Surgery and Related Research (JSSR 2020), Kobe Convention Center, Kobe, Japan, September 7-9, 2020.