Graft subsidence after instrument-assisted anterior cervical fusion

2002 ◽  
Vol 97 (2) ◽  
pp. 186-192 ◽  
Author(s):  
Gary W. Tye ◽  
R. Scott Graham ◽  
William C. Broaddus ◽  
Harold F. Young
Keyword(s):  
Smoking Status ◽  
Reoperation Rate ◽  
Anterior Cervical Fusion ◽  
Neurological Deficits ◽  
Cervical Fusion ◽  
Content Type ◽  
Plate Length ◽  
Graft Subsidence ◽  
Fine Print

Object. Bone grafts used in anterior cervical fusion (ACF) may subside postoperatively. The authors reviewed a recent series in which instrument-assisted ACF was performed to determine the degree of subsidence with respect to fusion length, use of segmental screws, and patient smoking status, age, and sex. Methods. Charts and implant records were reviewed for all 70 patients who underwent instrument-assisted ACF during a 2-year period. The procedures, grafting materials, plate types/lengths, and patient smoking status were recorded. The immediate postoperative and follow-up lateral radiographs were analyzed. The plate lengths and lengths of the fused segments were measured in a standardized fashion. The mean intraoperative and follow-up fusion segment lengths were 54.3 and 51.9 mm, respectively. Greater subsidence occurred in multilevel fusions than in single-level fusions. There were noticeable changes in the position of plates or screws on 14 of 70 follow-up x-ray films. No new neurological deficits related to graft subsidence occurred, and the reoperation rate was 3%. There was no statistical relation between subsidence and the following variables: segmental fixation, smoking status, sex, age, or dowel size when corrected for length of the plate. Hardware migration correlated significantly with plate length in cases of two- and three-level fusions. Conclusions. The length of a fusion segment decreases in the immediate weeks following instrument-assisted ACF. Construct length is the most important determinant of subsidence. When designing multilevel cervical constructs, consideration of the effects of graft subsidence may help to avoid hardware-related complications.

A randomized prospective study of an anterior cervical interbody fusion device with a minimum of 2 years of follow-up results

2000 ◽  
Vol 93 (2) ◽  
pp. 222-226 ◽  
Author(s):  
Robert J. Hacker
Keyword(s):  
Interbody Fusion ◽  
Donor Site ◽  
Anterior Cervical Fusion ◽  
Cervical Disc ◽  
Control Group ◽  
Cervical Fusion ◽  
Content Type ◽  
Solid Fusion ◽  
Fine Print

Object. Despite variations in technique, inherent problems persist with current approaches to anterior cervical fusion. This study was performed to determine whether anterior cervical fusion performed using an investigational device was safe and effective in the treatment of degenerative cervical disc disorders and whether this device offered advantages over current techniques. Methods. Fifty-four patients with radiculopathy with or without mild myelopathy due to one- or two-level cervical degenerative disc disease were randomized as part of a Food and Drug Administration device study. Following microsurgical discectomy, the control group was treated with iliac crest graft fusion; the experimental study group underwent insertion of an interspace cage and placement of a local autograft. All patients received postoperative follow-up care for at least 2 years. Good or excellent results were found in approximately 97% of the experimental group and 88% of the control group. A solid fusion was achieved in all patients who underwent one-level cage placement, and a solid fusion at one or both levels was achieved in over 90% of both groups. Chronic donor site pain was reported by 31% of the control group. Conclusions. In this study, the use of an interbody fusion cage avoided donor site morbidity and placement of autograft achieved a high rate of good or excellent results. Interbody fusion cages appear safe and effective, and their use helps to avoid some of the inherent problems in performing current anterior cervical fusion techniques.

Use of cylindrical titanium mesh and locking plates in anterior cervical fusion

2001 ◽  
Vol 94 (1) ◽  
pp. 174-178 ◽  
Author(s):  
Kaushik Das ◽  
William T. Couldwell ◽  
Gerard Sava ◽  
Rudolph F. Tadonio
Keyword(s):  
Cervical Spine ◽  
Iliac Crest ◽  
Locking Plate ◽  
Anterior Cervical Fusion ◽  
Cervical Fusion ◽  
Titanium Mesh ◽  
Content Type ◽  
Locking Plate System ◽  
Fine Print

✓ After performing anterior cervical corpectomy or discectomy for cervical spondolytic myelopathy or radiculopathy, iliac crest bone graft and fibular auto- or allograft is often used to achieve arthrodesis in the cervical spine. The purpose of this study was to evaluate the use of a cylindrical titanium mesh and locking plate system as an alternative technique in achieving anterior cervical fusion and maintaining lordosis. Hospital records and radiographs of 38 patients who underwent anterior cervical discectomies (28 patients) or corpectomies (10 patients) from 1995 to 1997 were reviewed retrospectively. All patients had undergone arthrodesis in which autograft and a cylindrical titanium mesh and anterior locking plate fixation were used after discectomy or corpectomy. There were 20 men and 18 women (mean age 46.1 years; range 34–72 years). Presenting symptoms included radiculopathy (61%), myelopathy (37%), and neck pain (2%). Preoperative and postoperative radiographs were studied, and data were obtained on the following: overall lordosis or kyphosis of the cervical spine, segmental lordosis or kyphosis at each surgically treated level, and evidence of fusion. In all of the patients in whom lordosis was present preoperatively, lordosis was maintained during the follow-up period. The overall fusion rate was 100%. The average change in overall lordosis or kyphosis related to the fixation devices was 1.2° (range 1–5°); the average segmental change was 2.3° (range 0–5°); and the mean follow up was 16 months (range 12–36 months). Anterior cervical fusion with cylindrical titanium mesh and cervical locking plate system is an effective method of achieving arthrodesis and maintaining alignment in the cervical spine. The construct may provide additional load-sharing function, and it avoids the use of cadaveric bone or the need for harvesting tricortical iliac crest autograft.

A fatal, chronically growing basilar artery: a new type of dissecting aneurysm

1996 ◽  
Vol 84 (6) ◽  
pp. 962-971 ◽  
Author(s):  
Tohru Mizutani
Keyword(s):  
Mr Imaging ◽  
Basilar Artery ◽  
Dissecting Aneurysm ◽  
Neurological Deficits ◽  
Vertebrobasilar Insufficiency ◽  
Content Type ◽  
Asymptomatic Patients ◽  
Basilar Arteries ◽  
Fine Print

✓ A long-term follow-up study (minimum duration 2 years) was made of 13 patients with tortuous dilated basilar arteries. Of these, five patients had symptoms related to the presence of such arteries. Symptoms present at a very early stage included vertebrobasilar insufficiency in two patients, brainstem infarction in two patients, and left hemifacial spasm in one patient. Initial magnetic resonance (MR) imaging in serial slices of basilar arteries obtained from the five symptomatic patients showed an intimal flap or a subadventitial hematoma, both of which are characteristic of a dissecting aneurysm. In contrast, the basilar arteries in the eight asymptomatic patients did not show particular findings and they remained clinically and radiologically silent during the follow-up period. All of the lesions in the five symptomatic patients gradually grew to fantastic sizes, with progressive deterioration of the related clinical symptoms. Dilation of the basilar artery was consistent with hemorrhage into the “pseudolumen” within the laminated thrombus, which was confirmed by MR imaging studies. Of the five symptomatic patients studied, two died of fatal subarachnoid hemorrhage (SAH) and two of brainstem compression; the fifth patient remains alive without neurological deficits. In the three patients who underwent autopsy, a definite macroscopic double lumen was observed in both the proximal and distal ends of the aneurysms within the layer of the thickening intima. Microscopically, multiple mural dissections, fragmentation of internal elastic lamina (IEL), and degeneration of media were diffusely observed in the remarkably extended wall of the aneurysms. The substantial mechanism of pathogenesis and enlargement in the symptomatic, highly tortuous dilated artery might initially be macroscopic dissection within a thickening intima and subsequent repetitive hemorrhaging within a laminated thrombus in the pseudolumen combined with microscopic multiple mural dissections on the basis of a weakened IEL. The authors note and caution that symptomatic, tortuous dilated basilar arteries cannot be overlooked because they include a group of malignant arteries that may grow rapidly, resulting in a fatal course.

The surgical technique of anterior cervical fusion using bone grafts obtained from cervical vertebral bodies

1994 ◽  
Vol 80 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Toyohiko Isu ◽  
Kyosuke Kamada ◽  
Nobuaki Kobayashi ◽  
Shoji Mabuchi
Keyword(s):  
Surgical Technique ◽  
Donor Site ◽  
Bone Grafts ◽  
Anterior Cervical Fusion ◽  
Cervical Fusion ◽  
Disc Disease ◽  
Nerve Roots ◽  
Content Type ◽  
Vertebral Bodies

✓ The authors describe the surgical technique of anterior cervical fusion using bone grafts obtained from cervical vertebral bodies. This series consisted of 90 patients with cervical intervertebral disc disease suffering from cervical spondylotic myelopathy. Thirty-five patients were operated on at one level, 33 at two levels, and 22 at three levels. Postoperative x-ray films showed solid bone fusion in all patients at a mean follow-up time of 24 months (range 1 year to 3 years 6 months). Anterior angulation was found in four (4.4%) of the 90 patients. This surgical procedure has two major advantages: 1) there are no complications related to the iliac donor site, allowing early patient mobilization; and 2) the extensive posterior spur can be removed safely and easily under a wide operative field without damaging the spinal cord and nerve roots.

Intramedullary ependymoma of the spinal cord

1990 ◽  
Vol 72 (4) ◽  
pp. 523-532 ◽  
Author(s):  
Paul C. McCormick ◽  
Roland Torres ◽  
Kalmon D. Post ◽  
Bennett M. Stein
Keyword(s):  
Spinal Cord ◽  
Mr Imaging ◽  
Tumor Recurrence ◽  
Neurological Deficits ◽  
Functional Improvement ◽  
Consecutive Series ◽  
Intramedullary Spinal Cord ◽  
Content Type ◽  
Fine Print

✓ A consecutive series of 23 patients underwent operative removal of an intramedullary spinal cord ependymoma between January, 1976, and September, 1988. Thirteen women and 10 men between the age of 19 and 70 years experienced symptoms for a mean of 34 months preceding initial diagnosis. Eight patients had undergone treatment prior to tumor recurrence and referral. Mild neurological deficits were present in 22 patients on initial examination. The location of the tumors was predominantly cervical or cervicothoracic. Radiological evaluation revealed a wide spinal cord in all cases. Magnetic resonance (MR) imaging was the single most important radiological procedure. At operation, a complete removal was achieved in all patients. No patient received postoperative radiation therapy. Histological examination revealed a benign ependymoma in all cases. The follow-up period ranged from 6 to 159 months (mean 62 months) with seven patients followed for a minimum of 10 years after surgery. Fourteen patients underwent postoperative MR imaging at intervals ranging from 8 months to 10 years postoperatively. No patient has been lost to follow-up review and there were no deaths. No patient showed definite clinical or radiological evidence of tumor recurrence during the follow-up period. Recent neurological evaluation revealed functional improvement from initial preoperative clinical status in eight patients, no significant change in 12 patients, and deterioration in three patients. The data support the belief that long-term disease-free control of intramedullary spinal ependymomas with acceptable morbidity may be achieved utilizing microsurgical removal alone.

Characterization of perioperative seizures and epilepsy following aneurysmal subarachnoid hemorrhage

2003 ◽  
Vol 99 (6) ◽  
pp. 978-985 ◽  
Author(s):  
Chih-Lung Lin ◽  
Aaron S. Dumont ◽  
Ann-Shung Lieu ◽  
Chen-Po Yen ◽  
Shiuh-Lin Hwang ◽  
...  
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Predictive Factors ◽  
Aneurysmal Subarachnoid Hemorrhage ◽  
Neurological Deficits ◽  
Loss Of Consciousness ◽  
Content Type ◽  
Fisher Grade ◽  
The Mean ◽  
Fine Print

Object. The reported incidence, timing, and predictive factors of perioperative seizures and epilepsy after subarachnoid hemorrhage (SAH) have differed considerably because of a lack of uniform definitions and variable follow-up periods. In this study the authors evaluate the incidence, temporal course, and predictive factors of perioperative seizures and epilepsy during long-term follow up of patients with SAH who underwent surgical treatment. Methods. Two hundred seventeen patients who survived more than 2 years after surgery for ruptured intracranial aneurysms were enrolled and retrospectively studied. Episodes were categorized into onset seizures (≤ 12 hours of initial hemorrhage), preoperative seizures, postoperative seizures, and late epilepsy, according to their timing. The mean follow-up time was 78.7 months (range 24–157 months). Forty-six patients (21.2%) had at least one seizure post-SAH. Seventeen patients (7.8%) had onset seizures, five (2.3%) had preoperative seizures, four (1.8%) had postoperative seizures, 21 (9.7%) had at least one seizure episode after the 1st week postoperatively, and late epilepsy developed in 15 (6.9%). One (3.8%) of 26 patients with perioperative seizures (onset, preoperative, or postoperative seizure) had late epilepsy at follow up. The mean latency between the operation and the onset of late epilepsy was 8.3 months (range 0.3–19 months). Younger age (< 40 years old), loss of consciousness of more than 1 hour at ictus, and Fisher Grade 3 or greater on computerized tomography scans proved to be significantly related to onset seizures. Onset seizure was also a significant predictor of persistent neurological deficits (Glasgow Outcome Scale Scores 2–4) at follow up. Factors associated with the development of late epilepsy were loss of consciousness of more than 1 hour at ictus and persistent postoperative neurological deficit. Conclusions. Although up to one fifth of patients experienced seizure(s) after SAH, more than half had seizure(s) during the perioperative period. The frequency of late epilepsy in patients with perioperative seizures (7.8%) was not significantly higher than those without such seizures (6.8%). Perioperative seizures did not recur frequently and were not a significant predictor for late epilepsy.

Cerebral venous malformations

1990 ◽  
Vol 73 (4) ◽  
pp. 560-564 ◽  
Author(s):  
Daniele Rigamonti ◽  
Robert F. Spetzler ◽  
Marjorie Medina ◽  
Karen Rigamonti ◽  
David S. Geckle ◽  
...  
Keyword(s):  
Venous Malformation ◽  
Neurological Dysfunction ◽  
Neurological Deficits ◽  
Venous Angioma ◽  
Venous Malformations ◽  
Content Type ◽  
History Of ◽  
The Relationship ◽  
Fine Print

✓ Although cerebral venous malformations have been reported to cause epilepsy, progressive neurological deficits, and hemorrhage, their clinical significance remains controversial. In an attempt to clarify the natural history of the lesion and suggest an appropriate management strategy, the authors review their experience with 30 patients. In four patients with cerebellar venous angioma, an acute episode of ataxia was documented. The coexistence of a cavernous malformation was pathologically confirmed in the two patients who underwent surgery for bleeding presumed caused by the venous angioma. Infarction was shown in two patients and a tumor in two others. Follow-up periods ranged between 18 and 104 months, with only five patients symptomatic at the time of this report. Rebleeding had not occurred, nor had acute episodes of neurological dysfunction been documented. This clinical experience suggests that a venous malformation is frequently associated with other, more symptomatic conditions and is often erroneously identified as the source of the symptoms. Because the nature of the relationship between the venous malformation and the allied conditions remains ambiguous, it is recommended that patients harboring a “symptomatic” venous malformation undergo high-field magnetic resonance imaging to rule out underlying pathology, and that any such pathology be treated independently of the venous malformation.

Treatment of moyamoya disease with STA-MCA anastomosis

1978 ◽  
Vol 49 (5) ◽  
pp. 679-688 ◽  
Author(s):  
Jun Karasawa ◽  
Haruhiko Kikuchi ◽  
Seiji Furuse ◽  
Junichiro Kawamura ◽  
Toshisuke Sakaki
Keyword(s):  
Cerebrovascular Disease ◽  
Effective Treatment ◽  
Moyamoya Disease ◽  
Neurological Deficits ◽  
Unknown Etiology ◽  
Transient Ischemic Attacks ◽  
Content Type ◽  
Fine Print ◽  
Temporal Middle

✓ Moyamoya disease is a chronic occlusive cerebrovascular disease of unknown etiology for which no effective treatment has been found. The authors report the results of 23 superficial temporal-middle cerebral artery (STA-MCA) anastomoses and seven encephalomyosynangioses, performed on 13 cases with moyamoya disease and on four additional atypical cases. There were 10 children and seven adults in this study. The follow-up period ranged from 1 year and 4 months to 4 years and 1 month postoperatively; nine patients had excellent results, five good, and one fair; two patients were unchanged. The anastomotic procedure was most effective for transient ischemic attacks, reversible ischemic neurological deficits, and even minor or moderate neurological symptoms. The STA-MCA anastomosis appears to be an effective treatment for moyamoya disease.

Radiographic and clinical follow-up review of Caspar plates in 49 patients

1996 ◽  
Vol 84 (6) ◽  
pp. 957-961 ◽  
Author(s):  
Christopher G. Paramore ◽  
Curtis A. Dickman ◽  
Volker K. H. Sonntag
Keyword(s):  
The Elderly ◽  
Fusion Rate ◽  
Neurological Deficits ◽  
Repeat Surgery ◽  
Content Type ◽  
Hardware Failure ◽  
Plate Length ◽  
Number Of Patients ◽  
Plate Failure

✓ Although they are excellent clinical tools, Caspar anterior cervical plates have not been studied closely with regard to their mechanisms of failure. As more extensive operations are contemplated on older, sicker patients, it is imperative to know when a plating system might be prone to failure and what the mechanism of that failure might be. Therefore, the authors reviewed 49 patients undergoing Caspar plate placement in whom sufficient radiographs were obtained to determine if the fate of the hardware was related to the patient's age, type of operation, and the length of construct. Eleven of 49 patients suffered hardware failure, defined as any amount of screw backout or breakage, plate pullout, or pseudarthrosis. Four patients underwent hardware removal; one underwent posterior fusion for pseudarthrosis. Only two required treatment in a halo brace. There was an eventual fusion rate of 100%, including one fibrous union, and one of the patients who underwent repeat surgery was lost to follow-up review. No graft extrusions or new neurological deficits were incurred as a result of hardware failure. Plate length predicted plate failure in a statistically significant manner. Increasing age and reoperation correlated with plate failure but were not statistically significant in this small number of patients. Telescoping of the bone graft and vertebral bodies, with concomitant migration of the plate and slippage of the screws, was common. However, telescoping was more profound in the group in which the plates failed. The authors conclude that Caspar plate failures are more likely to occur in the elderly and in patients who need longer constructs. Bone fusion can be expected even when the hardware loosens.

Surgical treatment of syringomyelia

1984 ◽  
Vol 61 (3) ◽  
pp. 531-538 ◽  
Author(s):  
Nicholas M. Barbaro ◽  
Charles B. Wilson ◽  
Philip H. Gutin ◽  
Michael S. B. Edwards
Keyword(s):  
Operative Therapy ◽  
Diagnostic Procedures ◽  
Clinical Findings ◽  
Neurological Deficits ◽  
Sensory Loss ◽  
Content Type ◽  
Neurological Improvement ◽  
Leg Stiffness ◽  
Fine Print

✓ The authors reviewed the clinical findings, radiological evaluation, and operative therapy of 39 patients with syringomyelia. Syringoperitoneal (SP) shunting was used in 15 patients and other procedures were used in 24 patients. Follow-up periods ranged from 1½ to 12 years. During the period of this study, metrizamide myelography in conjunction with early and delayed computerized tomography scanning replaced all other diagnostic procedures in patients with syringomyelia. Preoperative accuracy for the two procedures was 87%. The most common symptoms were weakness (79%), sensory loss (67%), pain (38%), and leg stiffness (28%). Surgery was most effective in stabilizing or alleviating pain (100%), sensory loss (81%), and weakness (74%); spasticity, headache, and bowel or bladder dysfunction were less likely to be reversed. Approximately 80% of patients with idiopathic and posttraumatic syringomyelia and 70% of those with arachnoiditis improved or stabilized. Better results were obtained in patients with less severe neurological deficits, suggesting the need for early operative intervention. A higher percentage of patients had neurological improvement with SP shunting than with any other procedure, especially when SP shunting was the first operation performed. Patients treated with SP shunts also had the highest complication rate, most often shunt malfunction. These results indicate that SP shunting is effective in reversing or arresting neurological deterioration in patients with syringomyelia.

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