A5020603660- Spine and Intervertebral Disc Pathology
- Musculoskeletal pain and rehabilitation
- Cerebrospinal fluid and hydrocephalus
- Cervical and Thoracic Myelopathy
- Glioma Diagnosis and Treatment
- Spinal Fractures and Fixation Techniques
- Fetal and Pediatric Neurological Disorders
- Spinal Dysraphism and Malformations
- Meningioma and schwannoma management
- Medical Imaging and Analysis
- Shoulder Injury and Treatment
- Head and Neck Surgical Oncology
- Nerve Injury and Rehabilitation
- Pelvic and Acetabular Injuries
- Medical Imaging Techniques and Applications
- Trigeminal Neuralgia and Treatments
- Vascular Malformations Diagnosis and Treatment
- Management of metastatic bone disease
- Radiomics and Machine Learning in Medical Imaging
- Facial Nerve Paralysis Treatment and Research
- Orthopedic Surgery and Rehabilitation
- Advanced Radiotherapy Techniques
- Brain Metastases and Treatment
- Epilepsy research and treatment
- Peripheral Nerve Disorders
Essen University Hospital
2025
An-Institut für Qualitätssicherung in der operativen Medizin
2023
Pacific Northwest University of Health Sciences
2021
Educational Service District 105
2019
Health Center
2019
Cornell University
2012-2018
Neurological Surgery
2012-2018
Medical University of Vienna
1982-2018
NewYork–Presbyterian Hospital
2014-2017
Presbyterian Hospital
2017
Endoscopic third ventriculostomy (ETV) has been shown to be a sufficient alternative in the surgical treatment of occlusive hydrocephalus. To elucidate ongoing discussion timing, indication, and technique, retrospective analysis 100 consecutive ETVs was conducted.One hundred were performed 95 patients (43 female 52 male patients). Their age ranged from 3 weeks 77 years (mean age, 36 yr). Hydrocephalus caused by aqueductal stenosis 40 patients, space-occupying lesions 42, intraventricular or...
Endoscopic third ventriculostomy (ETV) is an effective treatment for occlusive hydrocephalus caused by obstruction of the CSF flow in aqueduct or posterior fossa. We evaluated factors age, pathology and surgical technique on results ETV.Between November 1992 October 2000 171 ETV have been performed 159 patients. The follow-up was 150 age ranged from 10 days to 77 years (mean 35 years). benign aqueductal stenosis patients, space-occupying lesions 59, intraventricular hemorrhages 11, other...
Abstract A herniated intervertebral disc often causes back pain when tissue is displaced through a damaged annulus fibrosus. Currently, the only methods available for fibrosus repair involve mechanical closure of defect, which does little to address biological healing in tissue. Collagen hydrogels are injectable and have been used defects vivo . In this study, high‐density collagen at 5, 10, 15 mg/mL were made intact rat caudal discs vitro group gels also cross‐linked with riboflavin 0.03...
In Brief Study Design. Animal in vivo study. Objective. To test the capability of high-density collagen gel to repair annular defects. Summary Background Data. Annular defects are associated with spontaneous disc herniations and degeneration, which can lead significant morbidity. Persistent after surgical discectomies increase reherniation rates. Several synthetic biological materials have been developed for repair. This is first study an injectable biomaterial vivo. Methods. We punctured...
The most common reason that adults in the United States see their physician is lower back or neck pain secondary to degenerative disc disease. To date, approaches treat disease are confined purely mechanical devices designed either eliminate enable flexibility of diseased motion segment. Tissue engineered intervertebral discs (TE-IVDs) have been proposed as an alternative approach and shown promise replacing native IVD rodent tail spine. Here we demonstrate efficacy our TE-IVDs canine...
Computed tomography (CT) images in combination with a navigation device enable three-dimensional (3-D) localization of intracranial lesions. Furthermore, CT scanning can be adapted for intraoperative application to actualize the image data and check anatomical situation during operation. Frameless was used 100 patients. The procedure performed 46 cases an optical system, 38 sensory arm, 16 navigated microscope. Six skin markers were registration. Mean fiducial registration error 2.18 mm...
Radiculopathy caused by foraminal nerve root compression is a common pathology in the lumbar spine. Surgical decompression via conventional open foraminotomy treatment of choice when surgery indicated. Minimally invasive tubular through contralateral approach potentially effective surgical alternative.The aim this retrospective cohort study was to evaluate efficacy and benefits for radiculopathy.Patients with unilaterally dominant lower extremity radiculopathy, who underwent minimally...
Computed tomography (CT) images in combination with a navigation device enable three-dimensional (3-D) localization of intracranial lesions. Furthermore, CT scanning can be adapted for intraoperative application to actualize the image data and check anatomical situation during operation. Frameless was used 100 patients. The procedure performed 46 cases an optical system, 38 sensory arm, 16 navigated microscope. Six skin markers were registration. Mean fiducial registration error 2.18 mm...
Stereotactic guidance is useful for planning an accurate trajectory to the third ventricle. A guiding block with a ball joint was developed frame-based endoscopy and adaptors arm-based armless navigation systems. Between 1992 1996, 52 patients were operated on endoscopically in ventricle under stereotactic guidance. Thirty-eight ventriculostomies, 13 biopsies 10 cystic lesions performed. The coordinates of two points calculated; one foramen Monro second ventriculostomy performed endoscopic...
Objective: The aim of this study was to determine the use and safety endoscope as an adjunct during trigeminal facial nerve decompression procedures performed under keyhole conditions in posterior fossa. Method: We 67 surgeries 65 patients with symptomatic compression syndromes. diagnosis made mainly on basis clinical history, examination, magnetic resonance imaging scans. Surgery all cases endoscope-assisted conditions. follow-up 1 week postoperatively, 6 months, then yearly up 7 years. All...
Animal experimental study.To evaluate a novel quantitative imaging technique for assessing disc degeneration.T2-relaxation time (T2-RT) measurements have been used to assess degeneration quanti-tatively. T2 values correlate with the water content of intervertebral tissue and thereby allow indirect measurement nucleus pulposus (NP) hydration.We developed an algorithm subtract out magnetic resonance (MRI) voxels not representing NP on basis T2-RT values. Filtered were measure nuclear size by...
Object Tissue-engineered intervertebral discs (TE-IVDs) represent a new experimental approach for the treatment of degenerative disc disease. Compared with mechanical implants, TE-IVDs may better mimic properties native discs. The authors conducted study to evaluate outcome implanted into rat-tail spine using radiological parameters and histology. Methods consist distinct nucleus pulposus (NP) anulus fibrosus (AF) that are engineered in vitro from sheep IVD chondrocytes. In 10 athymic rats...
We retrospectively analyzed the indications, surgical techniques, and applicability of frameless neuronavigation to endoscopic procedures in a heterogeneous group 15 patients.In 8 patients indications for surgery were cystic lesions, 3 intraventricular tumors, 4 occlusive hydrocephalus. The mean age was 39 years (range 9-76 years). follow-up period ranged from 5-24 months (mean 10 months). Frameless accomplished with "operating arm system" cases "optical tracking 5 (RADIONICS, Burlington,...
Controversy surrounds the treatment of recurrent cubital tunnel syndrome after previous surgery. Irrespective surgical technique, namely pure decompression in ulnar groove and distal medial epicondyle, different methods volar transposition (subcutaneous, intramuscular, submuscular), results therapy are often not favorable, especially cases long-standing symptoms severe deficits. Twenty-two patients who had previously undergone for nerve entrapment at elbow were evaluated because persistent...
In this article, 12 re-ventriculostomies in the treatment for obstructive hydrocephalus are described. The etiology of was a benign aqueductal stenosis 9 patients, tumor around aqueduct 2 patients and intraventricular bleeding one patient. all cases initial ventriculostomy successful, but after time interval weeks to 6 years developed similar clinical symptoms as preoperatively. except case radiological findings spoke favour stoma closure. Intraoperatively completely closed 3 subtotal...
Cubital tunnel syndrome is the second most common entrapment neuropathy in upper limb; however, surgical treatment of ulnar nerve at elbow remains controversial. None presently advocated procedures (simple decompression nerve, medial epicondylectomy, subcutaneous, submuscular or intramuscular anterior transposition nerve) has proven optimal regarding long-term results. This paper presents experience treating cubital with simple 40 patients. Three months after surgery 23/36 patients did not...