Neurovegetative Störungen bei 230 Fällen basilärer Impression und Arnold-Chiarischer Mißbildung

There is growing recognition of the kyphotic clivo-axial angle (CXA) as an index of risk of brainstem deformity and craniocervical instability. This review of literature and prospective pilot study is the first to address the potential correlation between correction of the pathological CXA and postoperative clinical outcome. The CXA is a useful sentinel to alert the radiologist and surgeon to the possibility of brainstem deformity or instability. Ten adult subjects with ventral brainstem compression, radiographically manifest as a kyphotic CXA, underwent correction of deformity (normalization of the CXA) prior to fusion and occipito-cervical stabilization. The subjects were assessed preoperatively and at one, three, six, and twelve months after surgery, using established clinical metrics: the visual analog pain scale (VAS), American Spinal InjuryAssociation Impairment Scale (ASIA), Oswestry Neck Disability Index, SF 36, and Karnofsky Index. Parametric and non-parametric statistical tests were performed to correlate clinical outcome with CXA. No major complications were observed. Two patients showed pedicle screws adjacent to but not deforming the vertebral artery on post-operative CT scan. All clinical metrics showed statistically significant improvement. Mean CXA was normalized from 135.8° to 163.7°. Correction of abnormal CXA correlated with statistically significant clinical improvement in this cohort of patients. The study supports the thesis that the CXA maybe an important metric for predicting the risk of brainstem and upper spinal cord deformation. Further study is feasible and warranted.

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Utility of the clivo-axial angle in assessing brainstem deformity: pilot study and literature review

Henderson

Wilson

Mark

et al. 2017

Neurosurg Rev

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Cervical medullary syndrome secondary to craniocervical instability and ventral brainstem compression in hereditary hypermobility connective tissue disorders: 5-year follow-up after craniocervical reduction, fusion, and stabilization

et al. 2019

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A great deal of literature has drawn attention to the “complex Chiari,” wherein the presence of instability or ventral brainstem compression prompts consideration for addressing both concerns at the time of surgery. This report addresses the clinical and radiological features and surgical outcomes in a consecutive series of subjects with hereditary connective tissue disorders (HCTD) and Chiari malformation. In 2011 and 2012, 22 consecutive patients with cervical medullary syndrome and geneticist-confirmed hereditary connective tissue disorder (HCTD), with Chiari malformation (type 1 or 0) and kyphotic clivo-axial angle (CXA) enrolled in the IRB-approved study (IRB# 10-036-06: GBMC). Two subjects were excluded on the basis of previous cranio-spinal fusion or unrelated medical issues. Symptoms, patient satisfaction, and work status were assessed by a third-party questionnaire, pain by visual analog scale (0–10/10), neurologic exams by neurosurgeon, function by Karnofsky performance scale (KPS). Pre- and post-operative radiological measurements of clivo-axial angle (CXA), the Grabb-Mapstone-Oakes measurement, and Harris measurements were made independently by neuroradiologist, with pre- and post-operative imaging (MRI and CT), 10/20 with weight-bearing, flexion, and extension MRI. All subjects underwent open reduction, stabilization occiput to C2, and fusion with rib autograft. There was 100% follow-up (20/20) at 2 and 5 years. Patients were satisfied with the surgery and would do it again given the same circumstances (100%). Statistically significant improvement was seen with headache (8.2/10 pre-op to 4.5/10 post-op, p < 0.001, vertigo (92%), imbalance (82%), dysarthria (80%), dizziness (70%), memory problems (69%), walking problems (69%), function (KPS) (p < 0.001). Neurological deficits improved in all subjects. The CXA average improved from 127° to 148° (p < 0.001). The Grabb-Oakes and Harris measurements returned to normal. Fusion occurred in 100%. There were no significant differences between the 2- and 5-year period. Two patients returned to surgery for a superficial wound infections, and two required transfusion. All patients who had rib harvests had pain related that procedure (3/10), which abated by 5 years. The results support the literature, that open reduction of the kyphotic CXA to lessen ventral brainstem deformity, and fusion/stabilization to restore stability in patients with HCTD is feasible, associated with a low surgical morbidity, and results in enduring improvement in pain and function. Rib harvest resulted in pain for several years in almost all subjects.

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Clinical and Finite Element Analysis of Acute Whiplash

Tannoury¹,

Rihn²,

Wilson³

et al. 2011

TOSPINEJ

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Study Design:A prospective 1-year follow-up study of whiplash patients presenting with neurological signs/or symptoms (WADIII), and whiplash patients with neck pain but no neurologic findings (WADI/II). Objective:We hypothesize that WADI/II and WADIII are distinct entities, with regards to clinical presentation, pathoanatomy, and prognosis.Summary of Background Data: symptoms associated with whiplash injury range from mild neck pain (WADI/II), to injuries associated with neurologic sequellae (WADIII). To date, literature considers whiplash associated disorders (WAD) a single clinical and pathologic entity, with different grades of severity (WADI-IV).Methods: Thirty one subjects were divided into a WADIII study group and a WADI/II comparison group. All subjects underwent H&P, radiographic evaluations, and clinical outcome measures (collected at 3, 6, and 12 months). Statistical analysis was performed (Student T-test, Wilcoxon Signed-Rank test) with significance set at p=0.05. A finite element analysis (FEA) technology (SCOSIA©) was used to predict stresses within the neuraxis.Results: At day 0: Better neurologic assessments, functional performances, and higher quality-of-life measurements were noted in WADI/II compared to WADIII. VAS scores were comparable.At 12 months: Both groups reported improvements in neurologic status and disability symptoms. However functional recovery and quality-of-life measures significantly improved in WADIII, and conversely deteriorated in WADI/II along with notable worsening of pain symptoms. Litigation claims were comparable. FEA predicted higher stress within the neuraxis of WADIII, notably in subjects with preexisting stenosis and odontoid retroflexion. Conclusion:WADI/II and WADIII are distinct entities. Musculoskeletal injury precipitates WADI/II pain symptoms while neuronal stretching leads to WADIII neurologic injuries, which are mostly recoverable.

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Neurovegetative Störungen bei 230 Fällen basilärer Impression und Arnold-Chiarischer Mißbildung

Cited by 6 publications

References 4 publications

Utility of the clivo-axial angle in assessing brainstem deformity: pilot study and literature review

Utility of the clivo-axial angle in assessing brainstem deformity: pilot study and literature review

Cervical medullary syndrome secondary to craniocervical instability and ventral brainstem compression in hereditary hypermobility connective tissue disorders: 5-year follow-up after craniocervical reduction, fusion, and stabilization

Clinical and Finite Element Analysis of Acute Whiplash

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