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Surgery for herniated lumbar disc in private vs public hospitals: A pragmatic comparative effectiveness study.

Madsbu MA, Salvesen Ø, Carlsen SM, Westin S, Onarheim K, Nygaard ØP, Solberg TK, Gulati S.

Acta Neurochir (Wien). 2020 Jan 4. doi: 10.1007/s00701-019-04195-7. [Epub ahead of print]


Efficacy of antibiotic treatment in patients with chronic low back pain and Modic changes (the AIM study): double blind, randomised, placebo controlled, multicentre trial.

Bråten LCH, Rolfsen MP, Espeland A, Wigemyr M, Aßmus J, Froholdt A, Haugen AJ, Marchand GH, Kristoffersen PM, Lutro O, Randen S, Wilhelmsen M, Winsvold BS, Kadar TI, Holmgard TE, Vigeland MD, Vetti N, Nygaard ØP, Lie BA, Hellum C, Anke A, Grotle M, Schistad EI, Skouen JS, Grøvle L, Brox JI, Zwart JA, Storheim K; AIM study group.

BMJ. 2019 Oct 16;367:l5654. doi: 10.1136/bmj.l5654.


Impact of 2015 earthquakes on a local hospital in Nepal: A prospective hospital-based study.

Giri S, Risnes K, Uleberg O, Rogne T, Shrestha SK, Nygaard ØP, Koju R, Solligård E.

PLoS One. 2018 Feb 2;13(2):e0192076. doi: 10.1371/journal.pone.0192076. eCollection 2018.


Antibiotic treatment In patients with chronic low back pain and Modic changes (the AIM study): study protocol for a randomised controlled trial.

Storheim K, Espeland A, Grøvle L, Skouen JS, Aßmus J, Anke A, Froholdt A, Pedersen LM, Haugen AJ, Fors T, Schistad E, Lutro O, Marchand GH, Kadar T, Vetti N, Randen S, Nygaard ØP, Brox JI, Grotle M, Zwart JA.

Trials. 2017 Dec 15;18(1):596. doi: 10.1186/s13063-017-2306-8.


Lumbar Microdiscectomy in Obese Patients: A Multicenter Observational Study.

Madsbu MA, Øie LR, Salvesen Ø, Vangen-Lønne V, Nygaard ØP, Solberg TK, Gulati S.

World Neurosurg. 2018 Feb;110:e1004-e1010. doi: 10.1016/j.wneu.2017.11.156. Epub 2017 Dec 6.


Surgery for Herniated Lumbar Disc in Daily Tobacco Smokers: A Multicenter Observational Study.

Madsbu MA, Salvesen Ø, Werner DAT, Franssen E, Weber C, Nygaard ØP, Solberg TK, Gulati S.

World Neurosurg. 2018 Jan;109:e581-e587. doi: 10.1016/j.wneu.2017.10.024. Epub 2017 Oct 16.


Criteria for failure and worsening after surgery for lumbar disc herniation: a multicenter observational study based on data from the Norwegian Registry for Spine Surgery.

Werner DAT, Grotle M, Gulati S, Austevoll IM, Lønne G, Nygaard ØP, Solberg TK.

Eur Spine J. 2017 Oct;26(10):2650-2659. doi: 10.1007/s00586-017-5185-5. Epub 2017 Jun 14.


Risk factors for surgical site infections among 1,772 patients operated on for lumbar disc herniation: a multicentre observational registry-based study.

Habiba S, Nygaard ØP, Brox JI, Hellum C, Austevoll IM, Solberg TK.

Acta Neurochir (Wien). 2017 Jun;159(6):1113-1118. doi: 10.1007/s00701-017-3184-2. Epub 2017 Apr 20.


Variation in selection criteria and approaches to surgery for Lumbar Spinal Stenosis among patients treated in Boston and Norway.

Lønne G, Schoenfeld AJ, Cha TD, Nygaard ØP, Zwart JAH, Solberg T.

Clin Neurol Neurosurg. 2017 May;156:77-82. doi: 10.1016/j.clineuro.2017.03.008. Epub 2017 Mar 21.


Surgery for Herniated Lumbar Disk in Individuals 65 Years of Age or Older: A Multicenter Observational Study.

Madsbu MA, Solberg TK, Salvesen Ø, Nygaard ØP, Gulati S.

JAMA Surg. 2017 May 1;152(5):503-506. doi: 10.1001/jamasurg.2016.5557. No abstract available.


Lumbar microdiscectomy for sciatica in adolescents: a multicentre observational registry-based study.

Gulati S, Madsbu MA, Solberg TK, Sørlie A, Giannadakis C, Skram MK, Nygaard ØP, Jakola AS.

Acta Neurochir (Wien). 2017 Mar;159(3):509-516. doi: 10.1007/s00701-017-3077-4. Epub 2017 Jan 16.


The Norwegian Cervical Arthroplasty Trial (NORCAT): 2-year clinical outcome after single-level cervical arthroplasty versus fusion-a prospective, single-blinded, randomized, controlled multicenter study.

Sundseth J, Fredriksli OA, Kolstad F, Johnsen LG, Pripp AH, Andresen H, Myrseth E, Müller K, Nygaard ØP, Zwart JA; NORCAT study group.

Eur Spine J. 2017 Apr;26(4):1225-1235. doi: 10.1007/s00586-016-4922-5. Epub 2016 Dec 23.


Open discectomy vs microdiscectomy for lumbar disc herniation - a protocol for a pragmatic comparative effectiveness study.

Sørlie A, Gulati S, Giannadakis C, Carlsen SM, Salvesen Ø, Nygaard ØP, Solberg TK.

F1000Res. 2016 Sep 2;5:2170. eCollection 2016.


Surgical management of lumbar spinal stenosis: a survey among Norwegian spine surgeons.

Weber C, Lønne G, Rao V, Jakola AS, Solheim O, Nerland U, Rossvoll I, Nygaard ØP, Peul WC, Gulati S.

Acta Neurochir (Wien). 2017 Jan;159(1):191-197. doi: 10.1007/s00701-016-3020-0. Epub 2016 Nov 15.


Surgery for Lumbar Spinal Stenosis in Individuals Aged 80 and Older: A Multicenter Observational Study.

Giannadakis C, Solheim O, Jakola AS, Nordseth T, Gulati AM, Nerland US, Nygaard ØP, Solberg TK, Gulati S.

J Am Geriatr Soc. 2016 Oct;64(10):2011-2018. doi: 10.1111/jgs.14311. Epub 2016 Sep 9.


Heterotopic ossification and clinical outcome in nonconstrained cervical arthroplasty 2 years after surgery: the Norwegian Cervical Arthroplasty Trial (NORCAT).

Sundseth J, Jacobsen EA, Kolstad F, Sletteberg RO, Nygaard OP, Johnsen LG, Pripp AH, Andresen H, Fredriksli OA, Myrseth E, Zwart JA.

Eur Spine J. 2016 Jul;25(7):2271-8. doi: 10.1007/s00586-016-4549-6. Epub 2016 Apr 9.


The use of surgery for cervical degenerative disease in Norway in the period 2008-2014 : A population-based study of 6511 procedures.

Kristiansen JA, Balteskard L, Slettebø H, Nygaard ØP, Lied B, Kolstad F, Solberg TK.

Acta Neurochir (Wien). 2016 May;158(5):969-74. doi: 10.1007/s00701-016-2760-1. Epub 2016 Mar 17.


Repeated 3.0 Tesla Magnetic Resonance Imaging After Clinically Successful Lumbar Disc Surgery.

Weber C, Kvistad KA, Moholdt VA, Nygaard ØP, Solheim O.

Spine (Phila Pa 1976). 2016 Feb;41(3):239-45. doi: 10.1097/BRS.0000000000001189.


Inter- and Intraobserver Agreement of Morphological Grading for Central Lumbar Spinal Stenosis on Magnetic Resonance Imaging.

Weber C, Rao V, Gulati S, Kvistad KA, Nygaard ØP, Lønne G.

Global Spine J. 2015 Oct;5(5):406-10. doi: 10.1055/s-0035-1551651. Epub 2015 May 6.


Is There an Association Between Radiological Severity of Lumbar Spinal Stenosis and Disability, Pain, or Surgical Outcome?: A Multicenter Observational Study.

Weber C, Giannadakis C, Rao V, Jakola AS, Nerland U, Nygaard ØP, Solberg TK, Gulati S, Solheim O.

Spine (Phila Pa 1976). 2016 Jan;41(2):E78-83. doi: 10.1097/BRS.0000000000001166.


The Neck Disability Index (NDI) and its correlation with quality of life and mental health measures among patients with single-level cervical disc disease scheduled for surgery.

Sundseth J, Kolstad F, Johnsen LG, Pripp AH, Nygaard OP, Andresen H, Fredriksli OA, Myrseth E, Züchner M, Zwart JA.

Acta Neurochir (Wien). 2015 Oct;157(10):1807-12. doi: 10.1007/s00701-015-2534-1. Epub 2015 Aug 20.


Does Obesity Affect Outcomes After Decompressive Surgery for Lumbar Spinal Stenosis? A Multicenter, Observational, Registry-Based Study.

Giannadakis C, Nerland US, Solheim O, Jakola AS, Gulati M, Weber C, Nygaard ØP, Solberg TK, Gulati S.

World Neurosurg. 2015 Nov;84(5):1227-34. doi: 10.1016/j.wneu.2015.06.020. Epub 2015 Jun 20.


The Risk of Getting Worse: Predictors of Deterioration After Decompressive Surgery for Lumbar Spinal Stenosis: A Multicenter Observational Study.

Nerland US, Jakola AS, Giannadakis C, Solheim O, Weber C, Nygaard ØP, Solberg TK, Gulati S.

World Neurosurg. 2015 Oct;84(4):1095-102. doi: 10.1016/j.wneu.2015.05.055. Epub 2015 Jun 3.


Microsurgical decompression for central lumbar spinal stenosis: a single-center observational study.

Giannadakis C, Hammersbøen LE, Feyling C, Solheim O, Jakola AS, Nerland US, Nygaard ØP, Solberg TK, Gulati S.

Acta Neurochir (Wien). 2015 Jul;157(7):1165-71. doi: 10.1007/s00701-015-2450-4. Epub 2015 May 23.


Does daily tobacco smoking affect outcomes after microdecompression for degenerative central lumbar spinal stenosis? - A multicenter observational registry-based study.

Gulati S, Nordseth T, Nerland US, Gulati M, Weber C, Giannadakis C, Nygaard ØP, Solberg TK, Solheim O, Jakola AS.

Acta Neurochir (Wien). 2015 Jul;157(7):1157-64. doi: 10.1007/s00701-015-2437-1. Epub 2015 May 6.


Minimally invasive decompression versus open laminectomy for central stenosis of the lumbar spine: pragmatic comparative effectiveness study.

Nerland US, Jakola AS, Solheim O, Weber C, Rao V, Lønne G, Solberg TK, Salvesen Ø, Carlsen SM, Nygaard ØP, Gulati S.

BMJ. 2015 Apr 1;350:h1603. doi: 10.1136/bmj.h1603.


Comparing cost-effectiveness of X-Stop with minimally invasive decompression in lumbar spinal stenosis: a randomized controlled trial.

Lønne G, Johnsen LG, Aas E, Lydersen S, Andresen H, Rønning R, Nygaard ØP.

Spine (Phila Pa 1976). 2015 Apr 15;40(8):514-20. doi: 10.1097/BRS.0000000000000798.


Minimally invasive decompression versus x-stop in lumbar spinal stenosis: a randomized controlled multicenter study.

Lønne G, Johnsen LG, Rossvoll I, Andresen H, Storheim K, Zwart JA, Nygaard ØP.

Spine (Phila Pa 1976). 2015 Jan 15;40(2):77-85. doi: 10.1097/BRS.0000000000000691.


Incidence rates and surgery of primary intraspinal tumors in the era of modern neuroimaging: a national population-based study.

Weber C, Gulati S, Jakola AS, Habiba S, Nygaard ØP, Johannesen TB, Solheim O.

Spine (Phila Pa 1976). 2014 Jul 15;39(16):E967-73. doi: 10.1097/BRS.0000000000000412.


Comparative effectiveness of microdecompression and laminectomy for central lumbar spinal stenosis: study protocol for an observational study.

Nerland US, Jakola AS, Solheim O, Weber C, Rao V, Lønne G, Solberg TK, Salvesen O, Carlsen SM, Nygaard OP, Gulati S.

BMJ Open. 2014 Mar 20;4(3):e004651. doi: 10.1136/bmjopen-2013-004651.


MRI evaluation of lumbar spinal stenosis: is a rapid visual assessment as good as area measurement?

Lønne G, Ødegård B, Johnsen LG, Solberg TK, Kvistad KA, Nygaard ØP.

Eur Spine J. 2014 Jun;23(6):1320-4. doi: 10.1007/s00586-014-3248-4. Epub 2014 Feb 27.


Cost-effectiveness of total disc replacement versus multidisciplinary rehabilitation in patients with chronic low back pain: a Norwegian multicenter RCT.

Johnsen LG, Hellum C, Storheim K, Nygaard ØP, Brox JI, Rossvoll I, Rø M, Andresen H, Lydersen S, Grundnes O, Pedersen M, Leivseth G, Olafsson G, Borgström F, Fritzell P; Norwegian Spine Study Group.

Spine (Phila Pa 1976). 2014 Jan 1;39(1):23-32. doi: 10.1097/BRS.0000000000000065.


Magnetic resonance imaging evaluation after implantation of a titanium cervical disc prosthesis: a comparison of 1.5 and 3 Tesla magnet strength.

Sundseth J, Jacobsen EA, Kolstad F, Nygaard OP, Zwart JA, Hol PK.

Eur Spine J. 2013 Oct;22(10):2296-302. doi: 10.1007/s00586-013-2994-z. Epub 2013 Sep 6.


Comparison of the SF6D, the EQ5D, and the oswestry disability index in patients with chronic low back pain and degenerative disc disease.

Johnsen LG, Hellum C, Nygaard OP, Storheim K, Brox JI, Rossvoll I, Leivseth G, Grotle M.

BMC Musculoskelet Disord. 2013 Apr 26;14:148. doi: 10.1186/1471-2474-14-148.


Can we define success criteria for lumbar disc surgery? : estimates for a substantial amount of improvement in core outcome measures.

Solberg T, Johnsen LG, Nygaard ØP, Grotle M.

Acta Orthop. 2013 Apr;84(2):196-201. doi: 10.3109/17453674.2013.786634. Epub 2013 Mar 19.


Evidence-based clinical management and utilization of new technology in European neurosurgery.

Weber C, Jakola AS, Gulati S, Nygaard OP, Solheim O.

Acta Neurochir (Wien). 2013 Apr;155(4):747-54. doi: 10.1007/s00701-013-1640-1. Epub 2013 Feb 26.


Modic type I changes and recovery of back pain after lumbar microdiscectomy.

Sørlie A, Moholdt V, Kvistad KA, Nygaard ØP, Ingebrigtsen T, Iversen T, Kloster R, Solberg TK.

Eur Spine J. 2012 Nov;21(11):2252-8. doi: 10.1007/s00586-012-2419-4. Epub 2012 Jul 29.


Assessment of referrals to a multidisciplinary outpatient clinic for patients with back pain.

Gulati S, Jakola AS, Solheim O, Gabrielsen S, Godø PA, Skogstad B, Nygaard OP.

J Man Manip Ther. 2012 Feb;20(1):23-7. doi: 10.1179/2042618611Y.0000000021.


Utilization of a civilian academic center as a force multiplier in support of NATO special operations medicine - a pilot demonstration.

Lennarson P, Boedeker BH, Kuper GM, Nygaard OP, Johansen TO, Halvorsen A, Halvorsen I, Irizarry D.

Stud Health Technol Inform. 2012;173:260-2.


Recovery of muscle strength after microdiscectomy for lumbar disc herniation: a prospective cohort study with 1-year follow-up.

Lønne G, Solberg TK, Sjaavik K, Nygaard ØP.

Eur Spine J. 2012 Apr;21(4):655-9. doi: 10.1007/s00586-011-2122-x. Epub 2011 Dec 23.


Surgery with disc prosthesis versus rehabilitation in patients with low back pain and degenerative disc: two year follow-up of randomised study.

Hellum C, Johnsen LG, Storheim K, Nygaard OP, Brox JI, Rossvoll I, Rø M, Sandvik L, Grundnes O; Norwegian Spine Study Group.

BMJ. 2011 May 19;342:d2786. doi: 10.1136/bmj.d2786.


Clinical characteristics, pain, and disability in relation to alar ligament MRI findings.

Myran R, Zwart JA, Kvistad KA, Folvik M, Lydersen S, Ro M, Woodhouse A, Nygaard OP.

Spine (Phila Pa 1976). 2011 Jun;36(13):E862-7. doi: 10.1097/BRS.0b013e3181ff1dde.


Would loss to follow-up bias the outcome evaluation of patients operated for degenerative disorders of the lumbar spine?

Solberg TK, Sørlie A, Sjaavik K, Nygaard ØP, Ingebrigtsen T.

Acta Orthop. 2011 Feb;82(1):56-63. doi: 10.3109/17453674.2010.548024. Epub 2010 Dec 29.


[Neck pain with and without affection of nerve roots].

Nygaard ØP, Rø M, Andersen TI, Zwart JA.

Tidsskr Nor Laegeforen. 2010 Nov 18;130(22):2252-5. doi: 10.4045/tidsskr.09.1285. Review. Norwegian.


Clinical outcomes and safety assessment in elderly patients undergoing decompressive laminectomy for lumbar spinal stenosis: a prospective study.

Jakola AS, Sørlie A, Gulati S, Nygaard OP, Lydersen S, Solberg T.

BMC Surg. 2010 Nov 22;10:34. doi: 10.1186/1471-2482-10-34.


Anterior cervical arthrodesis using a "stand alone" cylindrical titanium cage: prospective analysis of radiographic parameters.

Kolstad F, Nygaard ØP, Andresen H, Leivseth G.

Spine (Phila Pa 1976). 2010 Jul 15;35(16):1545-50. doi: 10.1097/BRS.0b013e3181d259c1.


[Incorrect about changes in the cervical vertebrae].

Nygaard ØP, Müller TB, Rø M, Kvistad KA, Leivseth G.

Tidsskr Nor Laegeforen. 2010 Apr 22;130(8):816; author reply 816-7. doi: 10.4045/tidsskr.10.0103. Norwegian. No abstract available.


Four-year follow-up of surgical versus non-surgical therapy for chronic low back pain.

Brox JI, Nygaard ØP, Holm I, Keller A, Ingebrigtsen T, Reikerås O.

Ann Rheum Dis. 2010 Sep;69(9):1643-8. doi: 10.1136/ard.2009.108902. Epub 2009 Jul 26.


Magnetic resonance imaging assessment of the alar ligaments in whiplash injuries: a case-control study.

Myran R, Kvistad KA, Nygaard OP, Andresen H, Folvik M, Zwart JA.

Spine (Phila Pa 1976). 2008 Aug 15;33(18):2012-6. doi: 10.1097/BRS.0b013e31817bb0bd.


Soft tissue infection after missile injuries to the extremities. A non-randomized, prospective study in Gaza City.

Witsø E, Nygaard ØP, Hamouda H.

Prehosp Disaster Med. 2007 May-Jun;22(3):243-4. No abstract available.


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