scholarly journals Hand Motion Analysis Illustrates Differences When Drilling Cadaveric and Printed Temporal Bone

2021 ◽  
pp. 000348942110593
Author(s):  
Jordan B. Hochman ◽  
Justyn Pisa ◽  
Katrice Kazmerik ◽  
Bertram Unger
Keyword(s):  
Temporal Bone ◽  
Tracking System ◽  
Skill Assessment ◽  
Motion Patterns ◽  
Education Assessment ◽  
Hand Motion ◽  
Junior Staff ◽  
Cortical Mastoidectomy ◽  
Significant Difference ◽  
Temporal Bones

Objective: Temporal bone simulation is now commonly used to augment cadaveric education. Assessment of these tools is ongoing, with haptic modeling illustrating dissimilar motion patterns compared to cadaveric opportunities. This has the potential to result in maladaptive skill development. It is hypothesized that trainee drill motion patterns during printed model dissection may likewise demonstrate dissimilar hand motion patterns. Methods: Resident surgeons dissected 3D-printed temporal bones generated from microCT data and cadaveric simulations. A magnetic position tracking system (TrakSTAR Ascension, Yarraville, Australia) captured drill position and orientation. Skill assessment included cortical mastoidectomy, thinning procedures (sigmoid sinus, dural plate, posterior canal wall) and facial recess development. Dissection was performed by 8 trainees (n = 5 < PGY3 > n = 3) using k-cos metrics to analyze drill strokes within position recordings. K-cos metrics define strokes by change in direction, providing metrics for stroke duration, curvature, and length. Results: T-tests between models showed no significant difference in drill stroke frequency (cadaveric = 1.36/s, printed = 1.50/s, P < .40) but demonstrate significantly shorter duration (cadaveric = 0.37 s, printed = 0.16 s, P < .01) and a higher percentage of curved strokes (cadaveric = 31, printed = 67, P < .01) employed in printed bone dissection. Junior staff used a higher number of short strokes (junior = 0.54, senior = 0.38, P < .01) and higher percentage of curved strokes (junior = 35%, senior = 21%, P < .01). Conclusions: Significant differences in hand motions were present between simulations, however the significance is unclear. This may indicate that printed bone is not best positioned to be the principal training schema.

scholarly journals The depth of the facial nerve in the mastoid bone

2018 ◽  
Vol 4 (3) ◽  
pp. 666
Author(s):  
B. Y. Praveen Kumar ◽  
K. T. Chandrashekhar ◽  
M. K. Veena Pani ◽  
Sunil K. C. ◽  
Anand Kumar S. ◽  
...  
Keyword(s):  
Facial Nerve ◽  
Temporal Bone ◽  
Significant Variation ◽  
Canal Wall ◽  
Stylomastoid Foramen ◽  
Cortical Mastoidectomy ◽  
Canal Wall Down ◽  
Canal Wall Down Mastoidectomy ◽  
The Mean ◽  
Temporal Bones

<p class="abstract"><strong>Background:</strong> The hallmark of the temporal bone is variation. Various important structures like the facial nerve run in the temporal bone at various depths which can be injured during mastoidectomy.</p><p class="abstract"><strong>Methods:</strong> Twenty wet cadaveric temporal bones were dissected. A cortical mastoidectomy was performed followed by a canal wall down mastoidectomy and the depth of the vertical segment of the facial nerve in the mastoid was determined.  </p><p class="abstract"><strong>Results:</strong> The mean depth of the second genu was 13.82 mm. The mean depth of the stylomastoid foramen was 12.75 mm and the mean distance from the annulus at 6’0 clock to the stylomastoid foramen was 10.22 mm.</p><p><strong>Conclusions:</strong> There is significant variation in the average depth of the facial nerve in the mastoid. </p>

In vitro assessment of image-guided otologic surgery: Submillimeter accuracy within the region of the temporal bone

2005 ◽  
Vol 132 (3) ◽  
pp. 435-442 ◽  
Author(s):  
Robert F. Labadie ◽  
Rohan J. Shah ◽  
Steve S. Harris ◽  
Ebru Cetinkaya ◽  
David S. Haynes ◽  
...  
Keyword(s):  
Temporal Bone ◽  
Tracking System ◽  
Space Versus ◽  
Physical Space ◽  
Optical Tracking ◽  
Bite Block ◽  
Optical Tracking System ◽  
Otologic Surgery ◽  
Image Guided ◽  
Temporal Bones

OBJECTIVES: Application of image-guided surgery to otology has been limited by the need for sub-millimeter accuracy via a fiducial system that is easily usable (noninvasive and nonobstructive). METHODS: A dental bite-block was fitted with a rigid frame with 7 fiducial markers surrounding each external ear. The temporal bones of 3 cadaveric skulls were removed and replaced with surgical targets arranged in a bull's-eye pattern about the centroid of each temporal bone. The surgical targets were identified both within CT scans and in physical space using an infrared optical tracking system. The difference between positions in CT space versus physical space was calculated as target registration error. RESULTS: A total of 234 independent target registration errors were calculated. Mean ± standard deviation = 0.73 mm ± 0.25 mm. CONCLUSIONS: These findings show that image-guided otologic surgery with submillimeter accuracy is achievable with a minimally invasive fiducial frame. SIGNIFICANCE: In vivo validation of the system is ongoing. With such validation, this system may facilitate clinically applicable image-guided otologic surgery. EBM rating: A.

Correlation between temporal bone pneumatization, location of lateral sinus and length of the mastoid process

1992 ◽  
Vol 106 (6) ◽  
pp. 485-489 ◽  
Author(s):  
S. Turgut ◽  
M. Tos
Keyword(s):  
Temporal Bone ◽  
Middle Ear ◽  
External Auditory Canal ◽  
Sigmoid Sinus ◽  
Mastoid Process ◽  
Lateral Sinus ◽  
Gross Pathology ◽  
Significant Difference ◽  
Temporal Bone Pneumatization ◽  
Temporal Bones

AbstractThe relationship between temporal bone pneumatization and the location of the lateral sinus and length of the mastoid process was investigated in 60 fresh frozen adult temporal bones, by plain X-rays, computed tomography and surgical dissection including otomicroscopic findings. Temporal bone pneumatization was classified as small, moderate and large. After drilling, the shortest distances between the middle fossa dura and mastoid tip representing the mastoid length and between the sigmoid sinus and posterior border of external auditory canal were measured and compared to the degree of pneumatization. The distances in the specimens with pathological eardrum and adhesions in the middle ear were compared to the ones without gross pathology. The length of mastoid process was significantly shorter in specimens with small pneumatization than those with large (Mann Whitney P<0.001).The specimens with a pathological eardrum and middle ear adhesions had a significantly shorter mastoid length than those without gross pathology. There was no significant difference between degree of pneumatization and the shortest distance between sigmoid sinus and external auditory canal (Mann Whitney P>0.05). It is demonstrated that the ‘under-developed’ mastoid process can be a consequence of hampered pneumatization.

ANATOMICAL TOPOGRAPHIC FEATURES OF THE FACIAL NERVE ON CONE-BEAM CT

2019 ◽  
Vol 25 (3) ◽  
pp. 46-52
Author(s):  
A.A. Zubareva ◽  
◽  
Zh.Y. Beiseyeva ◽  
Keyword(s):  
Facial Nerve ◽  
Retrospective Analysis ◽  
Temporal Bone ◽  
Middle Ear ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Horizontal Semicircular Canal ◽  
Significant Difference ◽  
Group 2 ◽  
Temporal Bones

Introduction. Cone-beam computer tomography (CBCT) was introduced into the ENT practice more than 10 years ago. In recent years, it is actively used to visualize temporal bones in acute and chronic diseases of the middle ear (especially in visualizing implants of the middle and inner ear, shunts), but there is no precise description of anatomical features of the temporal bone’s structure. Materials and methods. A retrospective analysis of tomogram, made on a Sirona tomograph, Galaxis / Galileos software for the period from 08/04/2016 to 23/06/2017, in overall, there was analyzed 82 images, from which 71 images of temporal bones were selected from 41 people. Group 1 - CT of the temporal bone in patients with signs of acute inflammation of the middle ear, group 2 - CT of the temporal bone in patients with signs of chronic inflammation of the middle ear, group 3 - CT of the temporal bone in patients without signs of inflammation. Results. An algorithm for assessing the temporal bone according to the above parameters is(was) proposed. When three groups were compared, the length of the mastoid and drum part of the facial nerve, the canal of the facial nerve near the aditus ad antrum and the horizontal semicircular canal were revealed, and the distance between them, regardless to the progress of the disease, corresponds to the parameters of the norm. Conclusion. Thus, taking into account the data of the retrospective analysis, it should be noted that there was no significant difference between the quantitative indices of the facial nerve’s canal structure without inflammation and in the acute and chronic pathology of the middle ear

scholarly journals An Adaptive Superpixel Based Hand Gesture Tracking and Recognition System

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Hong-Min Zhu ◽  
Chi-Man Pun
Keyword(s):  
Template Matching ◽  
Tracking System ◽  
Recognition System ◽  
Appearance Model ◽  
Hand Gesture ◽  
Svm Classifier ◽  
Motion Trajectory ◽  
Hand Motion ◽  
Target Hand ◽  
Gesture Tracking

We propose an adaptive and robust superpixel based hand gesture tracking system, in which hand gestures drawn in free air are recognized from their motion trajectories. First we employed the motion detection of superpixels and unsupervised image segmentation to detect the moving target hand using the first few frames of the input video sequence. Then the hand appearance model is constructed from its surrounding superpixels. By incorporating the failure recovery and template matching in the tracking process, the target hand is tracked by an adaptive superpixel based tracking algorithm, where the problem of hand deformation, view-dependent appearance invariance, fast motion, and background confusion can be well handled to extract the correct hand motion trajectory. Finally, the hand gesture is recognized by the extracted motion trajectory with a trained SVM classifier. Experimental results show that our proposed system can achieve better performance compared to the existing state-of-the-art methods with the recognition accuracy 99.17% for easy set and 98.57 for hard set.

Objective structured assessment of technical skill in temporal bone dissection: validation of a novel tool

2021 ◽  
pp. 1-11
Author(s):  
M Stavrakas ◽  
G Menexes ◽  
S Triaridis ◽  
P Bamidis ◽  
J Constantinidis ◽  
...  
Keyword(s):  
Temporal Bone ◽  
Rating Scale ◽  
Assessment Tool ◽  
Three Dimensional ◽  
Technical Skills ◽  
Technical Skill ◽  
Global Rating Scale ◽  
Global Rating ◽  
Validity And Reliability ◽  
Cortical Mastoidectomy

Abstract Objective This study developed an assessment tool that was based on the objective structured assessment for technical skills principles, to be used for evaluation of surgical skills in cortical mastoidectomy. The objective structured assessment of technical skill is a well-established tool for evaluation of surgical ability. This study also aimed to identify the best material and printing method to make a three-dimensional printed temporal bone model. Methods Twenty-four otolaryngologists in training were asked to perform a cortical mastoidectomy on a three-dimensional printed temporal bone (selective laser sintering resin). They were scored according to the objective structured assessment of technical skill in temporal bone dissection tool developed in this study and an already validated global rating scale. Results Two external assessors scored the candidates, and it was concluded that the objective structured assessment of technical skill in temporal bone dissection tool demonstrated some main aspects of validity and reliability that can be used in training and performance evaluation of technical skills in mastoid surgery. Conclusion Apart from validating the new tool for temporal bone dissection training, the study showed that evolving three-dimensional printing technologies is of high value in simulation training with several advantages over traditional teaching methods.

scholarly journals Efficacy of Self-Directed Learning in the Supracondylar Fracture Performance Improvement Module at an Academic Pediatric Orthopedic Institution

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Eric W. Edmonds ◽  
John W. Kemppainen ◽  
Joanna H. Roocroft ◽  
John Munch ◽  
Tracey P. Bastrom
Keyword(s):  
Patient Outcomes ◽  
Supracondylar Fracture ◽  
The Self ◽  
Medical Society ◽  
Self Assessment ◽  
Life Long Learning ◽  
Junior Staff ◽  
Supracondylar Humerus Fractures ◽  
Significant Difference ◽  
Pediatric Orthopedic

Maintenance of certification (MOC) within a medical society requires continuing medical education that demonstrates life-long learning, cognitive expertise, and practice-based self-assessment. This prospective study sought to evaluate whether a self-directed Practice Improvement Module (PIM) would improve pediatric orthopedic patient outcomes, thus demonstrating evidence of life-long learning (Part II MOC credit) in treating supracondylar humerus fractures. Six surgeons and 113 patients were included. There was no significant difference in actual fracture outcome before or after PIM at any level of surgeon experience regarding radiographic appearance or need for reoperation (p>0.10). Junior staff demonstrated a statistically significant improvement in the percentage of time that marking the operative site was documented in the chart by the surgeon before (38%) and after (65%) PIM (p=0.02). The self-directed education portion of the supracondylar fracture PIM led to modest improvement in documentation habits among junior staff, without impact on overall patient outcomes. Therefore, the PIM appears to be less useful in providing evidence for life-long learning as it relates to surgical outcomes (Part II MOC/CME), yet, it may directly benefit practice-based self-assessment (Part IV MOC), and the self-assessment and Personal Improvement Plan may be the most important portion of the PIM to improve outcomes.

Otologic Histopathology of Fabry's Disease

1989 ◽  
Vol 98 (5) ◽  
pp. 359-363 ◽  
Author(s):  
Patricia A. Schachern ◽  
Michael M. Paparella ◽  
Donald A. Shea ◽  
Tae H. Yoon
Keyword(s):  
Temporal Bone ◽  
Ganglion Cells ◽  
Spiral Ganglion ◽  
Cell Loss ◽  
The Body ◽  
Spiral Ligament ◽  
Fabry’S Disease ◽  
Fabry's Disease ◽  
Temporal Bones ◽  
Spiral Ganglia

Fabry's disease is a rare progressive X-linked recessive disorder of glycosphingolipid metabolism. The accumulation of glycosphingolipids occurs in virtually all areas of the body, including the endothelial, perithelial, and smooth-muscle cells of blood vessels, the ganglion cells of the autonomic nervous system, and the glomeruli and tubules of the kidney. Although otologic symptoms have been described in these patients, to our knowledge there have been no temporal bone histopathologic reports. We describe the clinical histories, audiometric results, and temporal bone findings of two patients with this rare disorder. Both patients demonstrated a bilateral sloping sensorineural hearing loss audiometrically. Middle ear findings of seropurulent effusions and hyperplastic mucosa were seen in all four temporal bones. Strial and spiral ligament atrophy in all turns, and hair cell loss mainly in the basal turns, were also common findings. The number of spiral ganglion cells was reduced in all temporal bones; however, evidence of glycosphingolipid accumulation was not observed in the spiral ganglia.

scholarly journals Temporal Bone Pathology in Maxillary Sinus Carcinoma; A Study of 25 Temporal Bones.

1991 ◽  
Vol 84 (9) ◽  
pp. 1259-1265 ◽  
Author(s):  
Yasuyuki Ohira ◽  
Kimitaka Kaga ◽  
Keiyu Uebo ◽  
Akira Kodama
Keyword(s):  
Maxillary Sinus ◽  
Temporal Bone ◽  
Bone Pathology ◽  
Temporal Bones

scholarly journals sEMG Signal Acquisition Strategy towards Hand FES Control

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Cinthya Lourdes Toledo-Peral ◽  
Josefina Gutiérrez-Martínez ◽  
Jorge Airy Mercado-Gutiérrez ◽  
Ana Isabel Martín-Vignon-Whaley ◽  
Arturo Vera-Hernández ◽  
...  
Keyword(s):  
Electrode Placement ◽  
Signal Acquisition ◽  
Semg Signal ◽  
Motion Patterns ◽  
Upper Limb Rehabilitation ◽  
Hand Motion ◽  
Hand Dexterity ◽  
Severe Fatigue ◽  
Patients Experience ◽  
Limb Rehabilitation

Due to damage of the nervous system, patients experience impediments in their daily life: severe fatigue, tremor or impaired hand dexterity, hemiparesis, or hemiplegia. Surface electromyography (sEMG) signal analysis is used to identify motion; however, standardization of electrode placement and classification of sEMG patterns are major challenges. This paper describes a technique used to acquire sEMG signals for five hand motion patterns from six able-bodied subjects using an array of recording and stimulation electrodes placed on the forearm and its effects over functional electrical stimulation (FES) and volitional sEMG combinations, in order to eventually control a sEMG-driven FES neuroprosthesis for upper limb rehabilitation. A two-part protocol was performed. First, personalized templates to place eight sEMG bipolar channels were designed; with these data, a universal template, called forearm electrode set (FELT), was built. Second, volitional and evoked movements were recorded during FES application. 95% classification accuracy was achieved using two sessions per movement. With the FELT, it was possible to perform FES and sEMG recordings simultaneously. Also, it was possible to extract the volitional and evoked sEMG from the raw signal, which is highly important for closed-loop FES control.

Sign in / Sign up

Export Citation Format

Share Document