Spondylolysis, a defect in the pars interarticularis of. Multi-level Spondylolysis. A Case Report and Review of the Literature
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1 ulletin of the NYU Hospital for Joint Diseases 2011;69(4): Multi-level Spondylolysis Case Report and Review of the Literature David S. Hersh, M.D., Yong H. Kim, M.D., and fshin Razi, M.D. bstract The incidence of isthmic spondylolysis is approximately 3% to 6% in the general population. Spondylolytic defects involving multiple vertebral levels, on the other hand, are extremely rare. Only a handful of reports have examined the outcomes of surgical treatment of multi-level spondylolysis. Here, we present one case of bilateral pars defects at L3, L4, and L5. The patient, a 46-year-old female, presented with lower back pain radiating into the left lower extremity. Radiographs and CT scans of the lumbar spine revealed bilateral pars defects at L3-L5. The patient underwent lumbar discectomy and interbody fusion of L4-S1 as well as direct repair of the pars defect at L3. There were no postoperative complications, and by seven months the patient had improved clinically. While previous reports describe the use of either direct repair or fusion in the treatment of spondylolysis, we are unaware of reports describing the use of both techniques at adjacent levels. Spondylolysis, a defect in the pars interarticularis of the vertebral arch, and spondylolisthesis, the anterior displacement of one vertebral body with reference to the one below it, were classified by Wiltse and colleagues 1 into five types: dysplastic, isthmic, degenerative, traumatic, and pathologic. Isthmic spondylolysis, which refers to a stress fracture of the pars interarticularis, is the most common of the five types to present symptomatically, having a David S. Hersh, M.D., is a resident in the Department of Neurosurgery, University of Maryland Medical Center, altimore, Maryland. Yong H. Kim, M.D., is an ssistant Professor, and fshin Razi, M.D., is an ssistant Professor, in the Department of Orthopaedic Surgery, NYU Hospital for Joint Diseases, 301 East 17th Street, New York, New York. Correspondence: fshin Razi, M.D., Department of Orthopaedic Surgery, NYU Hospital for Joint Diseases. 145 East 32nd Street 4th Floor, New York, New York, 10016; afshin.razi@nyumc.org. reported incidence of 3% to 6% in the general population. Of these cases, the majority of defects (85% to 95%) occur at L5, with much of the remainder occurring at L4. 2 Spondylolytic defects involving multiple vertebral levels, on the other hand, are extremely rare. Only a handful of reports have examined the outcomes of surgical treatment of multi-level spondylolysis. 3-8 This case report describes a unique approach to the treatment of a patient with bilateral pars defects at L3, L4, and L5. Case Report 46-year-old female presented with lower back pain radiating into the left lower extremity. The patient s pain began 2 years prior to her initial visit when she had reportedly fallen and sustained an injury to her lower back. Despite rest, medications, and physical therapy, her pain persisted. t the time of presentation, the patient s pain was constant and worsened with activity. Physical examination showed decreased range of lumbar spinal motion, especially with regard to extension of the lumbar spine, which caused pain. The straight leg test was positive on the left side, reproducing left lower back and leg pain. Furthermore, there was decreased sensation to light touch over the left L5 distribution. Motor strength was 5/5, reflexes were equal and symmetric, and the remainder of the exam was within normal limits. nteroposterior (P), neutral lateral, flexion, and extension lateral views revealed grade 1 spondylolisthesis of L4-L5 and L5-S1. L4 and L5 pars defects were noted (Fig, 1). computed tomography (CT) scan revealed bilateral pars defects involving the L3, L4, and L5 levels, and grade 1 spondylolisthesis at L4-5 and L5-S1 (Fig. 2). Magnetic resonance imaging (MRI) revealed degenerative disc disease at L4-5 and L5-S1, a central disc herniation at L4-L5, and a left paracentral disc herniation at L5-S1 (Fig. 3). The patient underwent anterior lumbar discectomy and Hersh DS, Kim YH, Razi. Multi-level spondylolysis: a case report and review of the literature. ull NYU Hosp Jt Dis. 2011;69(4):
2 340 ulletin of the NYU Hospital for Joint Diseases 2011;69(4): Figure 1 Radiographs of the lumbar spine reveal pars defects at L4 and L5 (, P view and, oblique view). Figure 2 CT scan of the lumbar spine. The sagittal views show pars defects in L3, L4, and L5. There is also evidence of spondylolisthesis of L4-L5, and of L5-S1. interbody fusion of L4-5 and L5-S1 using a femoral ring structural allograft through a retroperitoneal approach. Posterior lumbar fusion and instrumentation of L4-S1 was then done using pedicle screw fixation and iliac crest bone grafting. Next, direct repair of the pars defect at L3 was done using pedicle screws bilaterally at the L3 pedicles. n upgoing laminar hook was placed on each side of the lamina, and short rods were placed between the laminar hooks and the pedicle screws. The pars defects in L3 were decorticated, and the earlier harvested bone chips were impacted in place between the defects. Utilizing the rod and the screw hook construct, the defect was compressed. Posterior lumbar laminectomy was performed at L4-L5 and L5-S1. n EI internal bone stimulator (EI/iomet, Parsippany, NJ) was placed along the pars repair of L3 on each side. The patient had no postoperative complications. She wore a thoracolumbosacral orthosis (TLSO) brace for 4 months following the surgery. t 7 months postoperatively, her leg and back pain had improved, and the patient was instructed to increase activity as tolerated. Throughout her postoperative visits, root tension signs were negative and neurological examinations did not reveal any deficits. Flexion, extension lateral, and P views showed good fusion with a well-fixed implant with no evidence of motion at the latest follow-up (Fig. 4). Discussion Spondylolytic defects involving multiple vertebral levels are very rare. ased on reported incidences at the time, Ravichandran3 calculated that only 1.48% of patients with back pain were diagnosed with multi-level spondylolysis. higher rate of multi-level spondylolysis (as well as singlelevel spondylolysis) has been found in native laskans.9 The causes of multi-level spondylolysis remain uncertain. Ogawa and associates 7 hypothesized that multi-level spondylolysis results from fatigue fractures of the pars interarticularis, which underlie most cases of single-level spondylolysis as well.10 Ravichandran,3 however, reported six cases of multi-level spondylolysis, all but one of which involved symptoms that were precipitated by trauma. He concluded that trauma is an important factor in producing multiple pars defects in a single patient, but that genetics may play a role as well. It is possible that repetitive extension movements related to this patient s employment
3 ulletin of the NYU Hospital for Joint Diseases 2011;69(4): as a housekeeper resulted in fatigue fractures at three levels. The patient s fall 2 years prior to her initial presentation may have then aggravated her pars defects, sparking the onset of her symptoms. Reports of patients with multi-level spondylolysis remain scarce. Privett and Middlemiss11 reported a 49-year-old male with bilateral three-level spondylolysis at L3, L4, and L5. The patient was employed as a coal merchant and presented with intermittent low backache of 5 years duration. The radiological findings in this patient were described, but the investigators did not describe any attempt at treatment. Similarly, Mathiesen and coworkers12 reported the case but not the treatment of a 53-year-old Eskimo female with multi-level spondylolysis. Following an episode of acute atraumatic lower back pain, the woman experienced intermittent (and ultimately chronic) lower back pain and right sided radicular pain. Radiological studies revealed spondylolysis at L3, L4, and L5 and spondylolisthesis at L4-5 and L5-S1. eningfield and Heselson13 also reported on a 35-year-old male employed as a farm laborer who presented with lower back pain with radiation into the left leg of 7 years duration. Radiographs revealed bilateral spondylolyses at L3 and L5 and a unilateral spondylolysis 341 Figure 3 T2-weighted MRI of the lumbar spine reveals degenerative disc disease at L4-L5 and L5-S1 with a left posterolateral disc herniation at L5-S1 (, sagittal view and, axial view). Fi gure 4 Radiographs at 7 months postoperative show complete healing (, P view and, lateral view). at L4. Spondylolisthesis at L5-S1 was also present. The patient was treated conservatively, but a description of his long-term outcome was not provided. The optimum treatment for multi-level spondylolysis remains controversial. It is widely accepted that most patients with single-level spondylolysis do well with conservative treatment.7,14 It is only when conservative treatment fails that surgical options are recommended. Ravichandran3 recommended a similar approach to patients with multi-level spondylolysis. Of the six cases of multilevel spondylolysis that he reported, four patients were treated surgically after conservative treatment failed, while the remaining two received conservative treatment alone. Half of the patients receiving surgery displayed excellent outcomes, while the other half were found to have poor outcomes. The two patients treated conservatively, on the other hand, had good clinical outcomes. However, conservative treatment has generally been reported to be ineffective for patients with multiple pars defects. Eingorn and Pizzutillo4 reported the case of an 18-year-old female with pars defects at L2, L3, and L4. Conservative treatment, which involved the use of an underarm body jacket for 4 months, proved only partially
4 342 ulletin of the NYU Hospital for Joint Diseases 2011;69(4): effective. The patient s symptoms recurred upon the resumption of her daily activities, and surgery was required. Similarly, of the six patients with multi-level spondylolysis reported by Chang and colleagues, 6 the five who were treated surgically had either good or excellent results based on the Henderson categories of functional capacity, while the one patient who was treated non-surgically only had fair results. t 16-month follow-up, the latter patient continued to complain of sports restriction. Furthermore, although the two patients reported by Ravichandran 3 who received conservative treatment had good clinical outcomes, spontaneous fusion of the pars defects did not occur. Consequently, surgical treatment is typically recommended for patients with multi-level spondylolysis. 6,7 The patient in our report presented with bilateral spondylolysis at L3, L4, and L5 and had already undergone 2 years of conservative treatment prior to presentation. Nevertheless, her back and leg pain persisted; therefore, it was decided that surgery was her best option. variety of procedures are used in the surgical treatment of spondylolysis. Such procedures may be grouped into two broad categories: fusion and direct repair of the pars defects. Of the six patients with multi-level spondylolysis reported by Ravichandran, 3 four were treated with segmental fusion. One patient had spondylolyses at L3-L5 and underwent L3-S1 intertransverse fusion. second patient had spondylolyses at L4-L5 and underwent L4-S1 intertransverse fusion. These patients both had excellent clinical outcomes. third patient had spondylolyses at L3 and L5 and underwent L2-L4 intertransverse fusion. The final patient had spondylolyses at L2 and L4 and underwent uck fusion at L2 and interspinous fusion using ttenborough springs at L4-S1. These patients had poor clinical outcomes. Ravichandran attributed the failure of the latter surgical procedures to the presence of an intervening unoperated segment between the two lytic vertebrae. The intervening unoperated segment likely resulted in abnormal mobility at that segment. Ravichandran, therefore, concluded that when surgically treating patients with multi-level spondylolysis, a continuous fusion that encompasses all of the defects and the intervening vertebrae results in the best outcomes. Direct repair of the pars defects represents an alternative to fusion. Unlike fusion, direct repair of the defects results in the preservation of motion at the involved vertebral segments. This becomes a significant factor when dealing with multi-level spondylolyses. The direct repair of pars defects involves a combination of bone grafting and fixation. Several options exist for fixation, including the use of a wire, pedicle screw, or hook Eingorn and Pizzutillo 4 reported that wire fixation, which involves the wiring of the transverse processes and spinous processes of the involved levels, was effective in treating a patient with bilateral pars defects at L3 and L4. Following the surgery, postoperative radiographs displayed complete fusion of the right pars defects at L3 and L4 and incomplete fusion of the left pars defects. The patient s symptoms resolved and she was able to resume her previous activities. Ogawa and associates 7 confirmed the effectiveness of direct repair with segmental wire fixation. They reported the results of seven patients with multi-level spondylolysis; five patients had pars defects at two levels bilaterally, while two patients had pars defects at three levels bilaterally. ll patients underwent direct repair with bone grafting and wire fixation at each of the involved levels. The patients wore a lumbar corset for 6 months postoperatively; during this period their activity was restricted. Five of the patients had excellent clinical outcomes, one patient had a good clinical outcome, and one patient had a fair clinical outcome. Radiographic and CT assessment revealed that 26 out of 32 of the pars defects were healed. The patients in whom healing of all pars defects did not take place had either attempted sports activities or had stopped wearing the lumbar corset within the 6-month postoperative period. In these patients, wire breakages occurred at the levels that did not heal. Furthermore, in the two cases in which excellent clinical outcomes were not achieved, wire breakages had occurred. Ogawa and associates, 7 therefore, concluded that segmental wire fixation and bone grafting is an effective treatment for multi-level spondylolysis, but that the use of a lumbar corset in the post-operative period is critical for the healing of the pars defects. Chang and coworkers, 6 on the other hand, analyzed the use of direct repair with screw fixation. They reported on soldiers with multi-level spondylolysis, five of whom were treated surgically. Of these patients, two had spondylolysis at L4 and L5, one at L3-L5, one at L3 and L4, and one at L2 and L3. These patients underwent direct repair with autogenic bone graft from iliac crest and instrumentation with hook screws or translaminar screws. They wore a TLSO brace for 3 months postoperatively. Four of these patients had good clinical results, and one had excellent results. Chung and colleagues 8 also reported the effectiveness of direct repair with screw fixation and autogenous bone grafting. Specifically, pedicle screw laminar hooks were used. Six patients with bilateral pars defects at 2 levels were treated with this surgical technique. Four of the patients had bilateral defects at L3 and L4, while the remaining two patients had defects at L3 and L5. ll of the patients had back pain that persisted despite 6 months of conservative treatment, and none of the patients were found to have degenerative disc disease at the affected or adjacent levels. Following the procedure, patients were instructed to wear lumbosacral braces for 3 months. CT scans revealed healing of 18 of the 24 pars defects. Furthermore, four patients had excellent clinical results, and two had good clinical results based on modified Macnab criteria. Fusion and direct repair of the pars defects, therefore, represent the two basic choices for treating multi-level spondylolysis. Several investigators have noted, however, that the direct repair of pars defects in patients over 20 to 30 years old result in lower union rates and poorer clinical outcomes than in younger patients. 16,21-26 Patients above
5 ulletin of the NYU Hospital for Joint Diseases 2011;69(4): the age of 25 have been found to have a higher prevalence of degenerative disc disease, which has been cited as an important reason for both low union rates and poor clinical outcome. 26,27 Consequently, Dai 27 reported that the state of the intervertebral discs is an important factor in choosing between direct repair of the pars defect and segmental fusion. In the absence of disc pathology, direct repair is preferred as it is thought to preserve lumbar motion, have a lower rate of morbidity, and provide greater anatomic continuity. 4,6,7 In the presence of disc disease, however, fusion is recommended. s this patient s MRI and CT scan had revealed significant disc degeneration with spondylolisthesis at the L4-L5 and L5-S1 levels, we chose to fuse these levels utilizing anterior and posterior approaches. In contrast, the L2-L3 and L3-4 disc spaces appeared relatively normal. Consequently, we chose to attempt a direct repair of the pars defects at the L3 level in spite of the patient s age, in the hope of preserving lumbar motion. The alternative a three-level fusion would surely have resulted in significant functional compromise. Direct repair with bone grafting and pedicle screw hook fixation was chosen as the method of direct repair, as studies involving this technique demonstrated good clinical results. 8,26 Conclusion Our treatment approach proved successful for this patient. t the latest follow-up, her lower back and leg pain had resolved and plain radiographs showed a solid fusion. We therefore think that in treating multi-level spondylolysis, a combination of direct repair and fusion is a viable approach. The technique to be used at each vertebral level should be assessed in relation to the degree of disc pathology at that level. Future studies should analyze this approach to treating multi-level spondylolysis in a larger sample of patients. Disclosure Statement None of the authors have a financial or proprietary interest in the subject matter or materials discussed, including, but not limited to, employment, consultancies, stock ownership, honoraria, and paid expert testimony. References 1. Wiltse LL, Newman PH, Macnab I. Classification of spondylolysis and spondylolisthesis. Clin Orthop Relat Res. 1976;117: Standaert CJ, Herring S. Spondylolysis: a critical review. r J Sports Med. 2000;34: Ravichandran G. Multiple lumbar spondylolyses. Spine. 1980;5(6): Eingorn D, Pizzutillo PD. Pars interarticularis fusion of multiple levels of lumbar spondylolysis. case report. Spine. 1985;10(3): l-sebai MW, l-khawashki H. Spondyloptosis and multiplelevel spondylolysis. Eur Spine J. 1999;8: Chang JH, Lee CH, Wu SS, et al. Management of multiple level spondylolysis of the lumbar spine in young males: a report of six cases. J Formos Med ssoc. 2001;100: Ogawa H, Nishimoto H, Hosoe H, et al. Clinical outcome after segmental wire fixation and bone grafting for repair of the defects in multiple level lumbar spondylolysis. J Spinal Disord Tech. 2007;20(7): Chung CH, Chiu HM, Wang SJ, et al. Direct repair of multiple levels lumbar spondylolysis by pedicle screw laminar hook and bone grafting: clinical, CT, and MRI-assessed study. J Spinal Disord Tech. 2007;20(5): Stewart T. The incidence of neural-arch defects in laskan natives, considered from the standpoint of etiology. J one Joint Surg m. 1953;35: Wiltse LL, Widell EH Jr, Jackson DW. Fatigue fracture: the basic lesion in isthmic spondylolisthesis. J one Joint Surg m. 1975;57: Privett JTJ, Middlemiss JH. Multiple lower lumbar spondylolyses. rit J Radiol. 1975;48: Mathiesen F, Simper L, Seerup. Multiple spondylolyses and spondylolistheses. rit J Radiol. 1984;57: eningfield SJ, Heselson NG. Multiple lumbar spondylolyses with transverse process pseudo-arthroses. case report. S fr Med J. 1989;11: Hu SS, Tribus C, Diab M, Ghanayem J. Spondylolisthesis and spondylolysis. J one Joint Surg m. 2008;90: uck JE. Direct repair of the defect in spondylolisthesis. Preliminary report. J one Joint Surg r. 1970;52: radford DS, Iza J. Repair of the defect in spondylolysis or minimal degrees of spondylolisthesis by segmental wire fixation and bone grafting. Spine. 1985;10(7): Scott JHS. The Edinburgh repair of isthmic (Group II) spondylolysis. J one Joint Surg r. 1987;69: Salib RM, Pettine K. Modified repair of a defect in spondylolysis or minimal spondylolisthesis by pedicle screw, segmental wire fixation, and bone grafting. Spine. 1993;18: Tokuhashi Y, Matsuzaki H. Repair of defects in spondylolysis by segmental pedicular screw hook fixation. preliminary report. Spine. 1996;21: Kakiuchi M. Repair of the defect in spondylolysis. Durable fixation with pedicle screws and laminar hooks. J one Joint Surg. 1997;79: Morscher E, Gerber, Fasel J. Surgical treatment of spondylolisthesis by bone grafting and direct stabilization of spondylolysis by means of a hook screw. rch Orthop Trauma Surg. 1984;103: Nicol RO, Scott JH. Lytic spondylolysis. Repair by wiring. Spine. 1986;11: Suh P, Esses SI, Kostuik JP. Repair of pars interarticularis defect. The prognostic value of pars infiltration. Spine. 1991;16(8 Suppl):S Johnson GV, Thompson G. The Scott wiring technique for direct repair of lumbar spondylolysis. J one Joint Surg. 1992;74: Jeanneret. Direct repair of spondylolysis. cta Orthop Scand Suppl. 1993;251: Roca J, Iborra M, Cavanilles-Walker JM, lbertí G. Direct repair of spondylolysis using a new pedicle screw hook fixation: clinical and CT-assessed study: an analysis of 19 patients. J Spinal Disord Tech. 2005;18 Suppl:S Dai LY. Disc degeneration in patients with lumbar spondylolysis. J Spinal Disord. 2000;13:
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