Total Corpectomy Research Articles

Application of a combined approach in the patient treatment with aggressive hemangiomas of the spine

Aggressive hemangioma of the spine is a benign vascular tumor. Stabilization, vertebroplasty, partial resection or total corpectomy of the affected vertebra, radiation therapy are known methods of treatment. Vertebral hemangiomas are more likely to be asymptomatic. Accordind to literature review 3–5 % of hemangiomas are symptomatic (pain). In 1.0 % of cases, hemangiomas cause symptoms of compression of nerve structures, spreading epidurally around the spinal cord and / or radicular nerves. A clinical case of a 63-year-old patient who underwent surgery in 2016 at another clinic for aggressive vertebral hemangiomas Th4 was presented. Bisphosphonate treatment was performed. Despite treatment, progressive lower extremities paraparesis was observed. Spinal angiography and total embolization of hemangiomas with liquid embolizing substances were performed. Immediately after embolization, the patient noted a pain intensity decrease. Surgery was performed in 40 minutes after transarterial embolization (removal of transpedicular stabilizing metal system, laminectomy of Th4 vertebra, decompression of the spinal cord, partial removal of Th4 hemangioma biopsy). The volume of intraoperative blood loss was 200 ml. Wound suction drainage was removed on the second postoperative day. No systemic complications (deep vein thrombosis, pneumonia) were noted. The patient was verticalized on the second postoperative day. After surgery, neurological function corresponded to the preoperative level (Frankel C). Regression of neurological deficit was observed (increased strength and range of motion of the lower extremities, bladder function improvement) the 5th postoperative day (Frankel D-E), Histological examination confirmed the diagnosis of hemangiomas. The patient was discharged from hospital with neurological improvement. Radiation therapy was recommended. 3 months after surgery, neurological function was assessed as Frankel E.

Anterior Placement of Cemented Fenestrated Screws in Conjunction with Anterior Reconstruction in Elderly Patients with Severe Vertebral Collapse and Paraparesis

Background: Elderly patients with severe osteoporosis are prone to sustain osteoporotic vertebral compression fractures (OVCF’s). Sometimes, they undergo significant vertebral collapse and kyphosis, leading to significant canal compromise and neurological deterioration. Case Description: We present a case series of three patients, of which two had OVCF’s of L1 and L3, respectively, while one patient had Koch’s spine D12 and L1. All three cases had severe vertebral collapse leading to kyphosis, severe pain, and canal compromise, neurological deterioration with paraparesis, and bowel bladder involvement. Surgery warranted total corpectomy of fractured vertebrae (anterior vertebral column resection) and reconstruction of the anterior column. Due to the significant degree of osteoporosis, fenestrated screws with bone cement (poly methyl acrylate) were used anteriorly along with vertebral body reconstruction with cage, through a purely anterior approach. This is the first instance of fenestrated screws being used anteriorly to reduce screw pull-out. In view of the strong anterior construct, a posterior surgery to supplement the fixation could be avoided in these thoracolumbar junctional cases. Results: No patient experienced loosening of implants, nor did any patient experience cement-related complications. Although the present follow-up of these patients is short (12 months), the patients are pain free and independently ambulatory. Conclusion: Using fenestrated screws in an anterior location allow vertebral reconstruction with a single surgery in elderly patients with severe osteoporosis, reducing chances of screw pull-out. Bone plugs at the tip to help prevent cement extravasation from the vertebral body. Keywords: Anterior fenestrated screws, Bone cement, Corpectomy, Osteoporotic vertebral compression fracture, Koch’s spine, Screw pull-out.

Successful surgical strategy for a cervical hemangioblastoma: Case report.

Background:Hemangioblastomas are hypervascular lesions and hence their surgical management is challenging. In particular, if complete resection is to be attained, all feeding and draining vessels must be occluded. Although most intramedullary spinal cord tumors are treated utilizing a posterior approach, we describe an anterior surgical strategy for resection of an intramedullary cervical hemangioblastoma.Case Description:A 36-year-old female with a spinal hemangioblastoma located in the anterior cervical spinal cord presented with a long-standing history of motor weakness of the right upper extremity. Magnetic resonance imaging revealed a large multilevel extensive syrinx and a focal intramedullary enhanced tumor at the C6 level. Angiography showed that the main feeder to the tumor was the left radicular artery (C8), which originated from the thyrocervical trunk, penetrated the dura mater, and branched both rostrally and caudally into the anterior spinal artery (ASA). Three-dimensional computer graphic images showed the tumor was located in the anterior part of the spinal cord, adjacent to and supplied by the ASA. The planned anterior surgical approach involved a total corpectomy of C6 and partial corpectomies of C5 and C7. The tumor was entirely removed despite multiple adhesions, and was successfully freed from the ASA. Patency of the ASA was confirmed utilizing intraoperative indocyanine green videoangiography. Intraoperatively, no monitoring changes were encountered. The pathological diagnosis was of a hemangioblastoma. No postoperative deficit occurred.Conclusions:An anterior approach for the resection of an anteriorly located intramedullary spinal hemangioblastomas was successfully accomplished in this case.

Burnt-out Metastatic Prostate Cancer

A burnt-out prostate cancer tumor is a very rare clinical entity. The term ‘burnt-out’ refers to a primary tumor that has spontaneously and nearly completely regressed without treatment. Since metastasis of prostate cancer is usually encountered in the presence of advanced disease, distant metastasis with an undetectable primary tumor is very rare. We report herein a case of a burnt-out prostate cancer tumor that metastasized to the thoracic (T) spine and caused cord compression. A 66-year-old man visited the Emergency Department due to weakness of both legs for the past two days. His blood and urine tests were normal at the time. His spine magnetic resonance imaging (MRI) scans looked like bone metastasis that involved the T-7 vertebral body and a posterior element, and caused spinal cord compression. Other images, including from the brain MRI, neck/chest/abdomino-pelvic computed tomography (CT) scan and 18F-fluorodeoxyglucose (FDG)-positron emission tomography (PET) and endoscopy, revealed no lesions that suggested malignancy. After total corpectomy T-7 and screw fixation/fusion at T5 to T10, the pathology report revealed a metastatic carcinoma that was strongly positive for prostate-specific antigen (PSA). The serum PSA value was 1.5 ng/mL. The transrectal 12-core prostate biopsy and ultrasonography showed no definitive hypoechoic lesion, but one specimen had slight (only 1%) adenocarcinoma with a Gleason score of 6 (3+3). The final diagnosis was burned-out prostate cancer with an initial normal PSA value. Although metastatic disease with an unknown primary origin was confirmed, a more aggressive approach in seeking the primary origin could provide a more specific treatment strategy and greater clinical benefit to patients.

Video-assisted paraspinal approach for the stabilization of the complex spine

Access to complex conditions of the thoracic spine and of the posterior mediastinum offers significant challenges, especially if the surgeon wishes to comply with the principles of minimal invasiveness. We report a successful vertical, paraspinal incision along with the subperiosteal removal of the overlying 2-cm rib segments combined with video assistance through single-access video-assisted thoracic surgery to perform a total T6 and partial T7 corpectomy for a metastatic multiple myeloma in a 50-year old man. This approach appears to provide excellent exposure and minimal morbidity when a reliable approach to the complex spine is needed.

Biomechanical analysis of anterior stabilization techniques for different partial and total vertebral corpectomy defect models

Restoration of the anterior spinal profile and regular load-bearing are the main goals in treating anterior spinal defects in cases of fracture. In large vertebral defects, the use of vertebral body replacements (VBRs) is common. For isolated anterior operations, VBRs are usually combined with antero-lateral angular stable or polyaxial plates. In preclinical biomechanical testing of spinal fracture stabilizations, complete corpectomies are often applied for fracture simulation. Complete corpectomies are reproducible and easily standardized but present a maximum instability not indicated for isolated anterior instrumentation. Therefore, this study investigates the stabilizing effect of VBRs and anterior plating systems on three different vertebral body defect models. Using 24 thoracolumbar spines, two different partial (PC 1+2) and one total corpectomy defect (CC) models were simulated and stabilized using different combinations of two VBRs and three different anterior plating systems. After anterior stabilization, range of motion (RoM) in the three main movement planes was evaluated. RoM was significantly reduced in all three motion planes for both stabilized partial corpectomy defect models compared to the stabilized complete corpectomy model and the intact specimens. The stabilized complete corpectomy defect model did not reduce RoM in flexion/extension and axial rotation compared to the intact state. Both partial corpectomy models are suitable for biomechanical testing of isolated anterior stabilization. A complete corpectomy model is not suitable to test isolated anterior instrumentation, as this simulates a rotationally unstable fracture, where isolated anterior instrumentation is not indicated in clinical practice.

Biomechanical analysis of a new expandable vertebral body replacement combined with a new polyaxial antero-lateral plate and/or pedicle screws and rods.

Restoration of the anterior spinal profile and regular load-bearing is the main goal treating anterior spinal defects in case of fracture. Over the past years, development and clinical usage of cages for vertebral body replacement have increased rapidly. For an enhanced stabilization of rotationally unstable fractures, additional antero-lateral implants are common. The purpose of this study was the evaluation of the biomechanical behaviour of a recently modified, in situ distractible vertebral body replacement (VBR) combined with a newly developed antero-lateral polyaxial plate and/or pedicle screws and rods using a full corpectomy model as fracture simulation. Twelve human spinal specimens (Th12-L4) were tested in a six-degree-of-freedom spine tester applying pure moments of 7.5 Nm to evaluate the stiffness of three different test instrumentations using a total corpectomy L2 model: (1) VBR+antero-lateral plate; (2) VBR, antero-lateral plate+pedicle screws and rods and (3) VBR+pedicle screws and rods. In the presented total corpectomy defect model, only the combined antero-posterior instrumentation (VBR, antero-lateral plate+pedicle screws and rods) could achieve higher stiffness in all three-movement planes than the intact specimen. In axial rotation, neither isolated anterior instrumentation (VBR+antero-lateral plate) nor isolated posterior instrumentation (VBR+pedicle screws and rods) could stabilize the total corpectomy compared to the intact state. For rotationally unstable vertebral body fractures, only combined antero-posterior instrumentation could significantly decrease the range of motion (ROM) in all motion planes compared to the intact state.

The biomechanical contribution of varying posterior constructs following anterior thoracolumbar corpectomy and reconstruction

Thoracolumbar corpectomy is a procedure commonly required for the treatment of various pathologies involving the vertebral body. Although the biomechanical stability of anterior reconstruction with plating has been studied, the biomechanical contribution of posterior instrumentation to anterior constructs remains unknown. The purpose of this study was to evaluate biomechanical stability after anterior thoracolumbar corpectomy and reconstruction with varying posterior constructs by measuring bending stiffness for the axes of flexion/extension, lateral bending, and axial rotation. Seven fresh human cadaveric thoracolumbar spine specimens were tested intact and after L-1 corpectomy and strut grafting with 4 different fixation techniques: anterior plating with bilateral, ipsilateral, contralateral, or no posterior pedicle screw fixation. Bending stiffness was measured under pure moments of +/- 5 Nm in flexion/extension, lateral bending, and axial rotation, while maintaining an axial preload of 100 N with a follower load. Results for each configuration were normalized to the intact condition and were compared using ANOVA. Spinal constructs with anterior-posterior spinal reconstruction and bilateral posterior pedicle screws were significantly stiffer in flexion/extension than intact spines or spines with anterior plating alone. Anterior plating without pedicle screw fixation was no different from the intact spine in flexion/extension and lateral bending. All constructs had reduced stiffness in axial rotation compared with intact spines. The addition of bilateral posterior instrumentation provided significantly greater stability at the thoracolumbar junction after total corpectomy than anterior plating and should be considered in cases in which anterior column reconstruction alone may be insufficient. In cases precluding bilateral posterior fixation, unilateral posterior instrumentation may provide some additional stability.

Extent of corpectomy determines primary stability following isolated anterior reconstruction in a thoracolumbar fracture model

Background Based on the development of minimal-invasive techniques and introduction of new implants enabling secure reconstruction an increasing number of patients are treated by isolated anterior column surgery. Most biomechanical studies dealing with thoracolumbar fracture models use worst-case scenarios of complete corpectomies to simulate vertebral body defects neglecting the influence of remaining cortical bone in partial corpus instability. Using a standardized partial and total corpectomy model we investigated the effect of the extent of corpectomy on stiffness in an anterior reconstruction model. Methods Twelve human thoracolumbar specimens (Th11-L3) were loaded in a spine simulator with pure moments in the three motion planes. Following intact testing partial corp- and discectomy and later complete corpectomy of L1 were performed. Defects were instrumented by vertebral body replacements and additional anterior plating systems bridging the defect from Th12 to L2. Intersegmental rotations were measured between Th12 and L2. Findings Significantly ( P < 0.05) increased range of motion was found in reconstructions of total compared to partial corpectomy. Total corpectomy reconstructions showed solely in lateral bending a significant reduction of range of motion compared to the intact state, while in axial rotation and flexion/extension it was significantly increased. Partial corpectomy reconstructions resulted in significantly reduced range of motion for lateral bending and flexion/extension compared to the intact specimen. Interpretation Isolated anterior reconstructions of the thoracolumbar spine revealed sufficient stiffness in the partial vertebral corpus defect. In contrast, total corpectomy did not show an adequate stiffness. Especially in regard to rotational stiffness additional posterior fixation has to be recommended.

Disseminated intraspinal hydatid disease

Spinal echinococcosis is a rare entity, accounting for 1% of all cases of hydatid disease. The authors report the case of a 60-year-old man whom they treated for recurrent nerve root compression due to disseminated intraspinal echinococcosis (hydatid disease). Six years previously he had undergone surgery on an emergency basis at another institution after presenting with acute paraplegia due to a primary extradural hydatid cyst of the thoracic spine. Unfortunately, during surgical removal of the cysts, the echinococcosis disseminated into the spinal canal. This complication was documented by magnetic resonance (MR) imaging. In the 4 years before the authors treated him, he was hospitalized 4 times for 4 recurrences of nerve root compression. The authors treated the disseminated disease successfully with total T7-8 corpectomy, grafting with titanium cage and Texas Scottish Rite Hospital instrumentation, and long-term administration of albendazole (400 mg daily). Early diagnosis, proper utilization of MR imaging, and radical resection of diseased vertebrae and soft tissues followed by anthelmintic treatment are essential to control disseminated spinal hydatidosis and prevent recurrence.

Symptomatic polyostotic fibrous dysplasia of the thoracic spine

We present a case of polyostotic fibrous dysplasia with limited involvement in thoracic spine and adjacent ribs. The patient underwent posterior instrumentation performed between Th3 and Th11 with pedicle screw system, followed by costotransversectomy of 7th and 8th costovertebral junctions and posterior spinal fusion for costal lesions. In the same operation, curettage was done for the lesion in Th6 vertebra and bone grafting and anterior total corpectomy were performed for Th7 and Th8 vertebrae. 360° spinal fusion was done using titanium mesh as strut graft and autogenous rib grafts. Fibrous dysplasia occurs rarely in axial bones than peripheral bones. The cystic lesions in segments of the whole spine should be evaluated for the possibility of fibrous dysplasia with detailed radiographical examination and biopsy.

Spinal Hydatidosis

Retrospective study. To revise the treatment of spinal hydatidosis. About 50% of cases of bone hydatidosis are spinal. Twenty patients with spinal hydatidosis were treated. There were 13 men and 7 women, with a mean age of 53.1 years. The median follow-up was 4.8 years. The infected area was the cervical spine in 1 patient, the dorsal spine in 7, the lumbar spine in 7, and the sacrum in 5. Curettage and resection of the infected bone were performed. The spine was exposed posteriorly in all but 2 patients. An additional posterior decompression and fusion with instrumentation were performed after removing the involved posterior elements in 8 patients. An anterior approach was used in 2 patients: a total corpectomy was performed and a bone graft was added. Two weeks later, a posterior decompression and fixation with instrumentation was done. No preoperative drugs were used. Medical antihelmintic treatment was used after surgery in all but 8 patients. Thirteen patients had spinal cord injury at the moment of surgery. The neurologic damage recovered only in 1 case. Repeated curettage was necessary in 13 cases: in 12 of them because of recurrence and in 1 because of surgical wound infection. In 6 cases of recurrence, there was also chronic wound infection. At last follow-up, 17 patients were free of disease. The treatment of choice of spinal hydatidosis is surgical removal of the affected vertebrae combined with posterior stabilization, followed by postoperative adjuvant chemotherapy. Recurrence is very frequent.

Gelfoam as a Barrier to Prevent Polymethylmethacrylate-Induced Thermal Injury of the Spinal Cord

Gelatin sponge (Gelfoam; Upjohn, Kalamazoo, MI, U.S.A.) is commonly used as an interpositional barrier to shield the spinal cord from thermal injury during vertebral reconstruction with polymethylmethacrylate bone cement. The aim of this study was to record epidural and intradural temperatures during polymethylmethacrylate reconstruction of vertebral corpectomy defects. Three surgical techniques (subtotal corpectomy, total corpectomy with insertion of a Gelfoam barrier, and total corpectomy with no barrier) were compared in vivo and in vitro in a porcine model. As expected, total corpectomy defects cemented without a Gelfoam barrier produced the highest epidural temperatures in vivo (52.8 degrees C) and in vitro (58 +/- 2 degrees C). The Gelfoam barrier provided some protection against heat transfer, but peak temperatures and absolute temperature increases were significantly higher than in defects with an intact posterior cortex (p < 0.05). These results indicate that an intact posterior cortex provides the best protection against heat transfer, whereas the use of a Gelfoam barrier appears to provide only partial protection against thermal injury.

Static and fatigue biomechanical properties of anterior thoracolumbar instrumentation systems. A synthetic testing model.

A mechanical testing standard for anterior thoracolumbar instrumentation systems was introduced, using a synthetic model. Twelve recent instrumentation systems were tested in static and fatigue modes. To establish the testing standard for anterior thoracolumbar instrumentation systems using a synthetic model and to evaluate the static and fatigue biomechanical properties of 12 anterior thoracolumbar instrumentation systems. Although numerous studies have been performed to evaluate the biomechanics of anterior spinal instrumentation using a cadaveric or animal tissue, problems of specimen variation, lack of reproducibility, and inability to perform fatigue testing have been pointed out. In no studies has a precise synthetic testing standard for anterior thoracolumbar instrumentation systems been described. An ultra-high-molecular-weight polyethylene cylinder was designed according to the anatomic dimensions of the vertebral body. Two cylinders spanned by spinal instrumentation simulated a total corpectomy defect, and a compressive lateral bending load was applied. The instrumentation assembly was precisely standardized. The static destructive and fatigue tests up to 2 million cycles at three load levels were conducted, followed by the failure mode analysis. Twelve anterior instrumentation systems, consisting of five plate and seven rod systems were compared in stiffness, bending strength, and cycles to failure. Static and fatigue test parameters both demonstrated highly significant differences between devices. The stiffness ranged from 280.5 kN/m in the Synthes plate (Synthes, Paoli, PA) to 67.9 kN/m in the Z-plate ATL (SofamorDanek, Memphis, TN). The Synthes plate and Kaneda SR titanium (AcroMed, Cleveland, OH) formed the highest subset in bending strength of 1516.1 N and 1209.9 N, respectively, whereas the Z-plate showed the lowest value of 407.3 N. There were no substantial differences between plate and rod devices. In fatigue, only three systems: Synthes plate, Kaneda SR titanium, and Olerud plate (Nord Opedic AB, Sweden) withstood 2 million cycles at 600 N. The failure mode analysis demonstrated plate or bolt fractures in plate systems and rod fractures in rod systems. The biomechanical testing standard for anterior thoracolumbar instrumentation systems was successfully designed. It provided a repeatable and consistent experimental condition and controlling dimensional and surgical factors. The comparison of 12 instrumentation systems highlights the importance of mechanically balanced device design without a weak link in the development of instrumentation.