Abstract
Background
Failed-back surgery syndrome remains a challenge for spinal surgeons. It can be related to several causes, including poor surgical indication, misdiagnosis, surgical technique failure, spondilodiscitis and fibrosis. Fibrosis has been associated with a poorer outcome in lumbar disc surgery, although its role in the generation of symptoms is not yet clear. In this study, the authors have analyzed any possible correlation between the clinical outcome and the degree of fibrosis.
Method
Forty consecutive patients were enrolled in a prospective study. All of them had operations in the lower lumbar disc in a single level for the first time. Three months after the operation they were submitted to clinical outcome evaluations and questionnaires, including Numeric Pain Rating scales (NPR) for lumbar and leg pain, the McGill Pain Questionnaire, The Quebec Back Pain Disability scale (QBPD) and Straight Leg Raising test. These data were correlated with the degree of fibrosis as revealed by Magnetic Resonance Imaging (MRI).
Findings
After 3 months, the NPR values for lumbar and leg pain ranged from 0 to 8 (mean 2.32 and 1.67 respectively). The values of the post-operative QBPD scale ranged from 1 to 71 (mean 25.9). Every patient showed a varied degree of fibrosis on MRI. However, statistical analysis depicted no significant correlation between fibrosis and a poorer clinical outcome for pain and disability.
Conclusions
The authors found no correlation between excessive fibrosis with lumbar and leg pain, disability or straight leg resistance. The role of fibrosis in the generation of symptoms in patients who have had lumbar disc surgery should be reevaluated.
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References
Abdou MS, Hardy RW (1999) Epidural fibrosis and the failed back surgery syndrome: history and physical findings. Neurol Res 21:S5–S8
Akmal M, Kesani A, Singh A, Wiseman M, Goodship A (2004) Effect of nicotine on spine disc cells: a cellular mechanism for disc degeneration. Spine 29:568–575
Andersson GB, Brown MD, Dvorak J, Herzog RJ, Kambin P, Malter A, McCulloch JA, Saal JA, Spratt KF, Weinstein JN (1996) Consensus summary on the diagnosis and treatment of lumbar disc herniation. Spine 21:75S–78S
Andersson GBJ (1998) Epidemiology of low back pain. Acta Orthop Scand 69:28–31
Andersson GBJ (1999) Epidemiological features of chronic low-back pain. Lancet 354:581–585
Ahn S, Cho Y, Ahn M, Jang S, Sohn Y, Kim H (2002) mRNA expression of cytokines and chemokines in herniated lumbar intervertebral discs. Spine 27:911–917
Annertz M, Jönsson B, Strömqvist B, Holtas S (1995) No relationship between epidural fibrosis and sciatica in the lumbar postdiscectomy syndrome. Spine 20:449–453
Anzai H, Hamba M, Onda A, Konno S, Kikuchi S (2002) Epidural application of nucleus pulposus enhances nociresponses of rat dorsal horn neurons. Spine 27:E50–E55
Aoki Y, Ohtori S, Ino H, Douya H, Ozawa T, Saito T, Moriya H, Takahashi K (2004) Disc inflammation potentially promotes axonal regeneration of dorsal root ganglion neurons innervating lumbar intervertebral disc in rats. Spine 29:2621–2626
Asch HL, Lewis PJ, Moreland DB, Egnatchik JG, Yu YJ, Clabeaux DE, Hyland AH (2002) Prospective multiple outcome study of outpatient lumbar microdiscectomy: should 75 to 80% success rate be the norm? J Neurosurg 96:34–44
Atlas S, Keller R, Wu Y, Deyo R, Singer DE (2001) Long-term outcome of surgical and nonsurgical management of sciatica secondary to a lumbar disc herniation: 10 year results from the Maine lumbar spine study. Spine 30:927–935
Aydin Y, Ziyal IM, Duman H, Turkmen CS, Basak M, Sahin Y (2002) Clinical and radiological results of lumbar microdiskectomy technique with preserving of ligamentum flavum comparing to the standard microdiskectomy technique. Surg Neurol 57:5–13
Babar S, Saifuddin A (2002) MRI of the post-discectomy lumbar spine. Clin Radiol 57:969–981
Bahr R, Andersen SO, Loken S, Fossan B, Hansen T, Holme I (2004) Low back pain among endurance athletes with and without specific back loading—a cross-sectional survey of country skier, rowers, orienteers, and nonathletic controls. Spine 29:449–454
Battié MC, Videman T, Parent E (2004) Lumbar disc degeneration. Epidemiologic and genetic influences. Spine 29:2679–2690
Bärlocher CB, Krauss JK, Seiler RW (2000) Central lumbar disc herniation. Acta Neurochir (Wien) 142:1369–1375
Barros Filho TEP, Oliveira CRGCM, Oliveira RP, Barros EMKP, Marcon RM, Cristante AF (2003) Estudo do uso da membrana de politetrafluoroetileno inerte expandido para a prevenção da fibrose pós laminectomia em ratos wistar. Acta Orthop Bras 11:110–117
Benneker LM, Heini PF, Alini M, Anderson SE, Ito K (2005) Vertebral endplate marrow contact channel occlusions and intervertebral disc degeneration. Spine 30(2):167–173
Bogduk N, Anat D (1991) The lumbar disc and low back pain. Neurosurg Clin N Am 2:791–806
Bonatelli APF, Prandini MN (2003) Lombociatalgias e cervicobraquialgias. In Prado FC, Ramos JA, Valle JR (eds). Atualização terapêutica (21st ed). Ed. Artes Médicas, São Paulo, pp 898–899
Bora H, Aykol S, Akyürek N, Akmansu M, Ataoglu O (2001) Inhibition of epidural scar tissue formation after spinal surgery: external irradiation vs. spinal membrane application. Int J Radiat Oncol Biol Phys 51:507–513
Borenstein DG (2001) Epidemiology, etiology, diagnostic evaluation and treatment of low back pain. Curr Opin Rheumatol 13:128–134
Carey TS, Evans AT, Hadler NM, Lieberman G, Kalsbeek WD, Jackman AM, Fryer JG, McNutt RA (1996) Acute severe low back pain: a population-based study of prevalence and care-seeking. Spine 21:339–344
Carroll LJ, Cassidy JD, Côté P (2004) Depression as a risk factor for onset of an episode of troublesome neck and low back pain. Pain 107:134–139
Castellanos RF, Huerta JVM, Ramírez SO (1992) Fibrosis postquirúrgica como causa de fracaso de la cirugía de columna, diagnosticada mediante tomografia axial computada y contraste endovenoso. Rev Mex Ortop Traumatol 6:223–224
Childs J, Piva S, Fritz J (2005) Responsiveness of the numeric pain rating scale in patients with low back pain. Spine 30:1331–1334
Cornefjord M, Sato K, Olmarker K, Rydevik B, Nordborg C (1997) A model for chronic nerve root compression studies. Presentation of a porcine model for controlled, slow-onset compression with analysis of anatomic aspects, compression onset rate, and morphologic and neurophysiologic effects. Spine 22:946–957
Coskun E, Süzer T, Topuz O, Zencir M, Pakdermili E, Tahta K (2000) Relationships between epidural fibrosis, pain, disability and psychological factors after lumbar disc surgery. Eur Spine J 9:218–223
Currie SR, Wang J (2004) Chronic back pain and major depression in the general Canadian population. Pain 107:54–60
Davidson M, Keating JL, Eyres S (2004) A low back-specific version of the SF-36 physical functioning scale. Spine 29:586–594
Defino HLA, Paccola CAJ (2000) Hérnia de disco. Diagn Trat 5:25–29
Dina TS, Boden SD, Davis DO (1995) Lumbar spine after surgery for herniated disk: imaging findings in the early postoperative period. Am J Radiol 164:665–671
Doita M, Kanatani T, Harada T, Mizuno K (1996) Imunohistological study of the ruptured intervertebral disc of the lumbar spine. Spine 21:235–241
Einhaus SL, Robertson JT, Dohan FC, Wujek JR, Ahmad S (1997) Reduction of peridural fibrosis after lumbar laminotomy and discectomy in dogs by a resorbable gel (Adcon-L). Spine 22:1440–1447
Elfering A, Semmer N, Birkhofer D, Zanetti M, Hodler J, Boos N (2002) Risk factors for lumbar disc degeneration. Spine 27:125–134
Fairbank JCT, Couper J, Davies JB, O’Brien JP (1980) The Oswestry low back pain disability questionnaire. Physiotherapy 66:271–273
Fandiño J, Botana C, Viladrich A, Gómez-Bueno J (1993) Reoperation after lumbar disc surgery: results in 130 cases. Acta Neurochir (Wien) 122:102–104
Fazzi A, Barros Filho TEP, Basile Junior R (1991) Complicações da cirurgia de hérnia discal. Rev Hosp Clin Fac Med Univ Sao Paulo 46:303–310
Fortes FSG, Souza CGGT, Barros Filho TEP (2000) Lombalgia: magnitude do problema. Acta Ortop Bras 8:47–51
Fiume D, Sherkat S, Callovini GM, Parziale G, Gazzeri G (1995) Treatment of the failed back surgery syndrome due to lumbo-sacral epidural fibrosis. Acta Neurochir (Wien) 64:116–118
Fogelholm RR, Alho AV (2001) Smoking and intervertebral disc degeneration. Med Hypotheses 56:537–539
Fraser RD, Sandhu A, Gogan WJ (1995) Magnetic resonance imaging findings 10 years after treatment for lumbar disc herniation. Spine 20:710–714
Freemont AJ, Jeziorska M, Hoyland JA, Rooney P, Kumar S (2002) Mast cells in the pathogenesis of chronic back pain: a hypothesis. J Pathol 197:281–285
Fritsch EW, Heisel J, Rupp S (1996) The failed back surgery syndrome: reasons, intraoperative findings and long-term results. A report of 182 operative treatments. Spine 21:626–633
Gambardella G, Gervasio O, Zaccone C, Puglisi E (2005) Prevention of recurrent radicular pain after lumbar disc surgery: a prospective study. Acta Neurochir Suppl 92:151–154
Ganzer D, Giese K, Volker L, Pietzner U, Follak N, Merk H (2003) Two-year results after lumbar microdiscectomy with and without prophylaxis of a peridural fibrosis using Adcon-L. Arch Orthop Trauma Surg 123:17–21
Garfin SR, Rydevik B, Lind B, Massie J (1995) Spinal nerve root compression. Spine 20:1810–1820
Geiss A, Rohleder N, Kirschbaum C, Steinbach K, Bauer HW, Anton F (2005) Predicting the failure of disc surgery by a hypofunctional HPA axis: evidence from a prospective study on patients undergoing disc surgery. Pain 114:104–117
Gerszten PC, Moossu JJ, Bahri S, Kalend A, Martinez AJ (1999) Inhibition of peridural fibrosis after laminectomy using low-dose external beam radiation in a rat model. Neurosurgery 44:597–603
Gibson JN, Grant IC, Waddell G (1999) The Cochrane review of surgery for lumbar disc prolapse and degenerative lumbar spondylosis. Spine 24:1820–1832
Görgülü A, Simsek O, Çobanoglu S, Imer M, Parsak T (2004) The effect of epidural free fat graft on the outcome of lumbar disc surgery. Neurosurg Rev 27:181–184
Goupille P (1996) Causes des echecs de la chirurgie discale. Rev Rhum (Ed Fr) 63(4):255–260
Grotle M, Brox J, Vollestad N (2005) Functional status and disability questionnaires: what do they assess? A systematic review of back-specific outcome questionnaires. Spine 30:130–140
Hakkinen A, Ylinen J, Kautiainen H, Airaksinen O, Hernos A, Kiviranta I (2003) Does the outcome 2 months after lumbar disc surgery predict the outcome 12 months later? Disabil Rehabil 25:968–972
Haq I, Cruz-Almeida Y, Siqueira EB, Noremberg M, Green BA, Levi AD (2005) Postoperative fibrosis after surgical treatment of the porcine spinal cord: a comparison of dural substitutes. Invited submission from the Joint Section Meeting on Disorders of the Spine and Peripheral Nerves, March 2004. J Neurosurg Spine 2:50–54
Hildebrandt J, Pfingsten M, Saur P, Jansen P (1997) Prediction of success from a multidisciplinary treatment program for chronic low back pain. Spine 22:990–1001
Hueftle MG, Modic MT, Ross JS, Masayk TJ, Carter JR, Wilber RG, Bohlman HH, Steinberg PM, Delamarter RB (1988) Lumbar spine: postoperative MR imaging with Gd-DTPA. Radiology 167:817–824
Humphreys SC, Eck JC, Hodges SD (2002) Neuroimaging in low back pain. Am Fam Physician 65:2299–2306
Iencean StM (2000) Lumbar intervertebral disc herniation following experimental intradiscal pressure increase. Acta Neurochir 142:669–676
Jarvik JJ, Hollingworth W, Heagerty P, Haynor DR, Deyo RA (2001) The longitudinal assessment of imaging and disability of the back (LAIDback) study. Spine 26:1158–1166
Jarvik JG, Deyo RA (2002) Diagnostic evaluation of low back pain with emphasis on imaging. Ann Intern Med 137:586–597
Jönsson B, Strömqvist B (1996) Clinical characteristics of recurrent sciatica after lumbar discectomy. Spine 21:500–505
Karacan I, Aydin T, Sahin Z, Cidem M, Koyuncu H, Aktas I, Uludag M (2004) Facet angles in lumbar disc herniation: their relation to anthropometric features. Spine 29:1132–1136
Kobayashi S, Kokubo Y, Uchida K, Yayama T, Takeno K, Negoro K Nakajima H, Baba H, Yoshizawa H (2004) Effect of lumbar nerve root compression on primary sensory neurons and their central branches. Spine 30:276–282
Koitilanen E (1998) Long-term outcome of patients suffering from clinical instability after microsurgical treatment of lumbar disc herniation. Acta Neurochir (Wien) 140:120–125
Kopec JA, Esdaile JM, Abrahamovicz M, Abenhaim L, Wood-Dauphinee S Lamping DL, Williams JI (1995) The Quebec back pain disability scale. Measurement properties. Spine 20:341–352
Kraemer R, Wild A, Haak H, Herdmann J, Krauspe R, Kraemer J (2003) Classification and management of early complications in open lumbar microdiscectomy. Eur Spine J 12:239–246
Landeiro JA, Fonseca CO, Ribeiro CH, Almeida MAV, Flores MS, Lapenta M, Weldes F (1991) Reoperação e causas de falência em cirurgia do disco lombar. Arq Bras Neurocir 10:11–18
LaRocca H, Macnab I (1974) The laminectomy membrane. Studies in its evolution, characteristics, effects and prophylaxis in dogs. J Bone Jt Surg Br 56:545–550
Lee JY, Stenzel W, Ebel H, Wedekind C, Ernestus RI, Klug N (2004) Mitomycin C in preventing spinal epidural fibrosis in a laminectomy model in rats. J Neurosurg 100:52–55
Levy HI, Hanscom B, Boden SC (2002) Three-question depression screener used for lumbar disc herniations and spinal stenosis. Spine 27:1232–1237
Lotz JC (2004) Animal models of intervertebral disc degeneration: lessons learned. Spine 29:2742–2750
Malter AD, Larson EB, Urban N, Deyo RA (1996) Cost-effectiveness of lumbar discectomy for the treatment of herniated intervertebral disc. Spine 21:1048–1055
Mannion AF, Dvorak J, Müntener M, Grob D (2005) A prospective study of the interrelationship between subjective and objective measures of disability before and 2 months after lumbar decompression surgery for disc herniation. Eur Spine J 14:454–465
Markwalder TM, Battaglia M (1993) Failed back surgery syndrome. Part I: analysis of the clinical presentation and results of testing procedures for instability of the lumbar spine in 171 patients. Acta Neurochir 123:46–51
Maroon JC (2002) Current concepts in minimally invasive discectomy. Neurosurgery 51:S137–S145
Maroon JC, Abla AA, Bost J (2001) Association between peridural scar and persistent low back pain after lumbar discectomy. Neurol Res 21:S43–S46
McCall IW (2000) Lumbar herniated disks. Radiol Clin North Am 38:1293–1309
Melzack R (1975) The McGill pain questionnaire: major properties and scoring methods. Pain 1:277–299
Merskey H, Bogduk N (1994) Classification of chronic pain: descriptions of chronic pain syndromes and definitions of pain terms, 2nd edn. IASP, Seattle
Milette PC (2000) Classification, diagnostic imaging, and imaging characterization of a lumbar herniated disk. Radiol Clin North Am 38:1267–1292
Minguetti G, Franco JHA, Ludwig VB (1999) Avaliação das hérnias discais lombares pela ressonância megnética. Rev Bras Ortop 34:243–250
Mixter WJ, Barr JS (1934) Rupture of the intervertebral disc with involvement of the spinal canal. N Engl J Med 211:210–214
Nicoletti GF, Platania N, Albanese V (2005) Smooth dissection of ligamentum flavum for lumbar microdiscectomy. Preliminary report of this personal technique. Surg Neurol 64:232–235
North RB, Kidd DH, Piantadosi S (1995) Spinal cord stimulation versus reoperation for failed back surgery syndrome: a prospective, randomized study design. Acta Neurochir Suppl (Wien) 64:106–108
O’Donnell JL, O’Donnell AL (1996) Prostaglandin E2 content in herniated lumbar disc disease. Spine 21:1653–1656
Oleske DM, Neelankantan J, Andersson GB, Hinrichs BG, Lavender SA, Morrissey MJ Zold-Kilbourn P, Taylor E (2004) Factors affecting recovery from work-related, low back disorders in autoworkers. Arch Phys Med Rehabil 85:1362–1364
Omarker K, Myers RR (1998) Pathogenesis of sciatic pain: role of herniated nucleus pulposus and deformation of spinal nerve root and dorsal root ganglion. Pain 78:99–105
Ong A, Anderson J, Roche J (2003) A pilot study of the prevalence of lumbar disc degeneration in elite athletes with lower back pain at the Sydney 2000 Olympic Games. Br J Sports Med 37:263–266
Österman H, Sund R, Seitsalo S, Keskimäki I (2003) Risk of multiple reoperations after lumbar discectomy: a population based study. Spine 28:621–627
Palatinsky EA, Maier KH, Touhalisky DK, Mock JL, Hingson MT, Coker GT (1997) Adcon-T/N reduces in vivo perineural adhesion in a rat sciatic nerve reoperation model. J Hand Surg 22:331–335
Papageorgiou AC, Macfarlane GJ, Thomas E, Croft PR, Jayson MI, Silman AJ (1997) Psychosocial factors in the workplace—do they predict new episodes of low back pain? Evidence from the South Manchester back pain study. Spine 22:1137–1142
Pimenta CAM, Teixeira MJ (1997) Questionário de dor McGill: proposta de adaptação para a língua portuguesa. Rev Bras Anestesiol 47:177–186
Pincus T, Burton K, Vogel S, Field AP (2002) A systematic review of psychological factors as predictors of chronicity/disability in prospective cohorts of low back pain. Spine 27:E109–E120
Porchet F, Wietlisbach V, Burnand B, Daeppen K, Villemure J, Vader J (2002) Relationship between severity of lumbar disc disease and disability scores in sciatica patients. Neurosurgery 50:1253–1260
Postacchini F (2001) Lumbar disc herniation: a new equilibrium is needed between nonoperative and operative treatment (editorial). Spine 26:601
Prandini MN, Herculano MA, Paes N, Tella OI, Lacanna SN (2002) Lombalgias crônicas: quando operar. Rev Bras Neurol 38:26–32
Radu AS (2000) Síndrome pós-laminectomia e fibrose epidural. Rev Bras Reumatol 40:137–148
Rebain R, Baxter GD, McDonough S (2002) A systematic review of the passive straight leg raising test as a diagnostic aid for low back pain (1989 to 2000). Spine 27:E388–E395
Richter HP, Kast E, Tomczak R, Besenfelder W, Gaus W (2001) Results of applying Adcon-L gel after lumbar discectomy: the german Adcon-L study. J Neusosurg 95:179–189
Ross JS, Zepp R, Modic MT (1996) The postoperative lumbar spine: enhanced MR evaluation of the intervertebral disc. Am J Neuroradiol 17:323–331
Ross JS, Robertson JT, Frederickson RCA, Petrie JL, Obuchowski N, Modic MT, deTriboulet N (1996) Association between peridural scar and recurrent radicular pain after lumbar discectomy: magnetic resonance evaluation. Neurosurgery 38:855–863
Ross JS, Obuchowski N, Zepp R (1998) The postoperative lumbar spine: epidural scar over a 1-year period. Am J Neuroradiol 19:183–186
Ross JS (1999) MR imaging of the postoperative lumbar spine. Magn Reson Imaging Clin N Am 7:513–524
Schultz IZ, Crook J, Meloche GR, Berkowitz J, Milner R, Zuberbier AO, Meloche W (2004) Psychological factors predictive of occupational low back disability: towards development of a return-to-work model. Pain 107:77–85
Sen O, Kizilkilic O, Aydin MV, Yalcin O, Erdogan B, Cekinmez M, Caner H, Altinors N (2004) The role of closed-suction drainage in preventing epidural fibrosis and its correlation with a new grading system of epidural fibrosis on the basis of MRI. Eur Spine J 14:409–414
Setton LA, Chen J (2004) Cell mechanisms and mechanobiology of intervertebral disc. Spine 29:2710–2723
Silva MC, Fassa AG, Valle NCJ (2004) Dor lombar crônica em uma população adulta do Sul do Brasil: prevalência e fatores associados. Cad Saúde Publica 20:377–385
Smith BH, Elliott AM, Hannaford PC, Chambers WA, Smith WC (2004) Factors related to the onset and persistence of chronic back pain in the community: results from a general population follow-up study. Spine 29:1032–1040
Song J, Park Y (2000) Ligament-sparing lumbar microdiscectomy: technical note. Surg Neurol 53:592–596
Songer MN, Rauschning W, Carson EW, Pandit SM (1995) Analysis of peridural scar formation and its prevention after lumbar laminotomy and discectomy in dogs. Spine 20:571–580
Specchia N, Pagnotta A, Toesca A, Greco F (2002) Cytokines and growth factors in the protruded intervertebral disc of the lumbar region. Eur Spine J 11:145–151
Spencer DL (1999) The anatomical basis of sciatica secondary to herniated lumbar disc: a review. Neurol Res 21:S33–S36
Spiliopoulou I, Korovessis P, Konstantinou D, Dimitracopoulos G (1994) IgG and IgM concentration in the prolapsed human intervertebral disc and sciatica etiology. Spine 19:1320–1323
Spinhover P, Kuile M, Kole-Snidjers AMJ, Mansfeld MH, Ouden DJ, Vlaeyen JWS (2004) Catastrophizing and internal pain control as mediators of outcome in the multidisciplinary treatment of chronic low back pain. Eur J Pain 8:211–219
Strokes IAF, Iatridis JC (2004) Mechanical conditions that accelerate intervertebral disc degeneration: overload versus immobilization. Spine 29:2724–2732
Swartz KR, Trost GR (2003) Recurrent lumbar disc herniation. Neurosurg Focus 15:1–4
Teixeira MJ, Pimenta CAM, Grossi SAA, Cruz DALM (1999) Avaliação da dor: fundamentos teóricos e análise crítica. Rev Med (São Paulo) 78:85–114
Theodore N, Sonntag VKH (2000) Spinal surgery: the past century and the next. Neurosurgery 46:767–777
Urban JPG, Smith S, Fairbank JCT (2004) Nutrition of the intervertebral disc. Spine 29:2700–2709
van der Giesen AM, Bouter LM, Nijhuis FJ (2000) Prediction of return to work of low back pain patients sicklisted for 3–4 months. Pain 87:285–294
van Goethem JWM, van de Kelft E, Biltjes IGGM, van Hasselt BAAM, van den Hauwe L, Parizel PM, de Schepper AMA (1996) MRI after successful lumbar discectomy. Neuroradiology 38:S90–S96
van Goethem JWM, Parizel PM, Jinkins JR (2002) Review article: MRI of the postoperative lumbar spine. Neuroradiology 44:723–729
Videman T, Battié MC, Gibbons LE, Maravilla K, Manninen H, Kaprio J (2003) Associations between back pain history and lumbar MRI findings. Spine 28:582–588
Vik A, Zwart JA, Hulleberg G, Nygaard OP (2001) Eight year outcome after surgery for lumbar disc herniation: a comparison of reoperated and not reoperated patients. Acta Neurochir (Wien) 143:607–611
Vogelsang JP, Finkenstaedt M, Vogelsang M, Markakis E (1999) Recurrent pain after lumbar discectomy: the diagnostic value of peridural scar on MRI. Eur J Spine 8:475–479
Waddell G (1991) Low back disability: a syndrome of western civilization. Neurosurg Clin N Am 2:719–738
Weber H (1983) Lumbar disc herniation: a controlled, prospective study with ten years of observation. Spine 8:131–140
Yoon ST, Park JS, Kim KS, Li JL, Attalah-Wasif ES, Hutton WC, Boden SD (2004) LMP-1 upregulates intervertebral disc cell production of proteoglycans ans BMPs in vitro and in vivo. Spine 29:2603–2611
Yoshira M, Nakamura T, Sei A, Kikuchi T, Takagi K, Matsukawa A (2004) Intervertebral disc cells produce tumor necrosis factor alpha, interleukin 1 beta and monocyte chemoattractant protein-1 immediately after herniation: an experimental study using a new hernia model. Spine 30:55–61
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Special thanks to Mrs. Marli Uchida and Mrs. Susan Kondagelski for the English edition and to Dr. Erasmo Barros for the drawings.
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Almeida, D.B., Prandini, M.N., Awamura, Y. et al. Outcome following lumbar disc surgery: the role of fibrosis. Acta Neurochir (Wien) 150, 1167–1176 (2008). https://doi.org/10.1007/s00701-008-0131-2
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DOI: https://doi.org/10.1007/s00701-008-0131-2