CLINICAL VALIDATION OF A NOVEL SPRING LOADED TENSIONING DEVICE AND COMPUTER ASSISTED NAVIGATION

This study presents the validation of the tensioning device that applies a constant load to the medial and lateral compartments of knee joint separately, which can collapse or expand on each side independently, and that should be able to provide a better evaluation of ligament tension and allow the computer software to better plan the appropriate bone cuts or ligament release, and reports the first phase of the clinical validation of the tensioning device, including first qualitative comparison with standard navigated technique and consideration on the use of the device. A randomized study, involving five experienced orthopedic surgeons with 58 complete data sets, revealed that there is no statistical difference between the gaps obtained with standard navigated technique and tensioning device in extension, while in flexion there is an average difference 1.4 mm.

Download Full-text

Image-guided periacetabular osteotomy: computer-assisted navigation compared with the conventional technique: A randomized study of 36 patients followed for 2 years

Acta Orthopaedica ◽

10.1080/17453670610012656 ◽

2006 ◽

Vol 77 (4) ◽

pp. 591-597 ◽

Cited By ~ 31

Author(s):

Pang-Hsin Hsieh ◽

Yu-Han Chang ◽

Chun-Hsiung Shih

Keyword(s):

Periacetabular Osteotomy ◽

Randomized Study ◽

Conventional Technique ◽

Computer Assisted ◽

Assisted Navigation ◽

Image Guided

Download Full-text

Large-console, Imageless Computer-assisted Navigation Vs Accelerometer Based Portable Navigation Technique of Total Knee Arthroplasty - a Prospective Randomized Study

Journal of the American College of Surgeons ◽

10.1016/j.jamcollsurg.2021.08.365 ◽

2021 ◽

Vol 233 (5) ◽

pp. e135

Author(s):

Rajesh Malhotra ◽

Arun M. Swamy ◽

Deepak Gautam ◽

Vikrant Manhas ◽

Vijay K. Digge

Keyword(s):

Total Knee Arthroplasty ◽

Knee Arthroplasty ◽

Randomized Study ◽

Prospective Randomized Study ◽

Computer Assisted ◽

Assisted Navigation ◽

Portable Navigation ◽

Total Knee

Download Full-text

Utilization of Spinal Intra-operative Three-dimensional Navigation by Canadian Surgeons and Trainees: A Population-based Time Trend Study

Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques ◽

10.1017/cjn.2018.376 ◽

2019 ◽

Vol 46 (1) ◽

pp. 87-95 ◽

Cited By ~ 1

Author(s):

Daipayan Guha ◽

Ali Moghaddamjou ◽

Zaneen H. Jiwani ◽

Naif M. Alotaibi ◽

Michael G. Fehlings ◽

...

Keyword(s):

Three Dimensional ◽

Spinal Instrumentation ◽

Population Based ◽

Computer Assisted ◽

Assisted Navigation ◽

Capital Costs ◽

Orthopedic Surgeons ◽

Surgical Trainees ◽

Single Payer ◽

The Impact

AbstractBackgroundComputer-assisted navigation (CAN) improves the accuracy of spinal instrumentation in vertebral fractures and degenerative spine disease; however, it is not widely adopted because of lack of training, high capital costs, workflow hindrances, and accuracy concerns. We characterize shifts in the use of spinal CAN over time and across disciplines in a single-payer health system, and assess the impact of intra-operative CAN on trainee proficiency across Canada.MethodsA prospectively maintained Ontario database of patients undergoing spinal instrumentation from 2005 to 2014 was reviewed retrospectively. Data were collected on treated pathology, spine region, surgical approach, institution type, and surgeon specialty. Trainee proficiency with CAN was assessed using an electronic questionnaire distributed across 15 Canadian orthopedic surgical and neurosurgical programs.ResultsIn our provincial cohort, 16.8% of instrumented fusions were CAN-guided. Navigation was used more frequently in academic institutions (15.9% vs. 12.3%, p<0.001) and by neurosurgeons than orthopedic surgeons (21.0% vs. 12.4%, p<0.001). Of residents and fellows 34.1% were fully comfortable using spinal CAN, greater for neurosurgical than orthopedic surgical trainees (48.1% vs. 11.8%, p=0.008). The use of CAN increased self-reported proficiency in thoracic instrumentation for all trainees by 11.0% (p=0.036), and in atlantoaxial instrumentation for orthopedic trainees by 18.0% (p=0.014).ConclusionsSpinal CAN is used most frequently by neurosurgeons and in academic centers. Most spine surgical trainees are not fully comfortable with the use of CAN, but report an increase in technical comfort with CAN guidance particularly for thoracic instrumentation. Increased education in spinal CAN for trainees, particularly at the fellowship stage and, specifically, for orthopedic surgery, may improve adoption.

Download Full-text

Clinical Validation of Computer-Assisted Navigation in Total Hip Arthroplasty

Advances in Orthopedics ◽

10.4061/2011/171783 ◽

2011 ◽

Vol 2011 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Eric Beaumont ◽

Pierre Beaumont ◽

Daniel Odermat ◽

Isabelle Fontaine ◽

Herbert Jansen ◽

...

Keyword(s):

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

Navigation System ◽

Ct Scans ◽

Computer Assisted ◽

Clinical Validation ◽

Clinical Validity ◽

Assisted Navigation ◽

Total Hip ◽

Secondary Objective

A CT-based navigation system is helpful to evaluate the reamer shaft and the impactor position/orientation during unilateral total hip arthroplasty (THA). The main objective of this study is to determine the accuracy of the Navitrack system by measuring the implant's true anteversion and inclination, based on pre- and postoperative CT scans (n=9patients). The secondary objective is to evaluate the clinical validity of measurements based on postop anteroposterior (AP) radiographs for determining the cup orientation. Postop CT-scan reconstructions and postop planar radiographs showed no significant differences in orientation compared to peroperative angles, suggesting a clinical validity of the system. Postoperative AP radiographs normally used in clinic are acceptable to determine the cup orientation, and small angular errors may originate from the patient position on the table.

Download Full-text

Similar outcomes in computer-assisted and conventional total knee arthroplasty: ten-year results of a prospective randomized study

BMC Musculoskeletal Disorders ◽

10.1186/s12891-021-04556-3 ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Franziska Beyer ◽

Alexander Pape ◽

Cornelia Lützner ◽

Stephan Kirschner ◽

Jörg Lützner

Keyword(s):

Randomized Study ◽

Patient Reported Outcome Measures ◽

Conventional Technique ◽

Patient Reported Outcome ◽

Long Term Results ◽

Computer Assisted ◽

Assisted Navigation ◽

Accuracy And Precision ◽

Patient Reported ◽

Total Knee

Abstract Background Computer-assisted navigation (CAS) was developed to improve the surgical accuracy and precision. Many studies demonstrated better alignment in the coronal plane in CAS TKA compared to conventional technique. The influence on the functional outcome is still unclear. Only few studies report long-term results of CAS TKA. This study was initiated to investigate 10-year patient-reported outcome of CAS and conventional TKA. Methods From initially 80 patients of a randomized study of CAS and conventional TKA a total of 50 patients could be evaluated at the 10-year follow-up. The Knee Society Score and EuroQuol Questionnaire were assessed. For all patients a competing risk analysis for revision was performed. Results The patient-reported outcome measures demonstrated similar values for both groups. The 10-year risk for revision was 2.5% for conventional TKA and 7.5% for CAS TKA (p=0.237). Conclusions There was no difference between CAS and conventional TKA with regard to patient-reported outcome and revision risk ten years after surgery. Trial registration This study was registered at clinicaltrials.gov on 11/30/2009, ID: NCT01022099.

Download Full-text

P.088 Spinal computer-assisted intra-operative three-dimensional navigation in Canada: a population-based time trend study

Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques ◽

10.1017/cjn.2017.172 ◽

2017 ◽

Vol 44 (S2) ◽

pp. S35-S36 ◽

Cited By ~ 1

Author(s):

D Guha ◽

A Moghaddamjou ◽

NM Alotaibi ◽

A Yee ◽

VX Yang

Keyword(s):

Temporal Trends ◽

Three Dimensional ◽

Population Based ◽

Learning Curves ◽

Computer Assisted ◽

Assisted Navigation ◽

Diagnostic Codes ◽

Orthopedic Surgeons ◽

Spinal Fusions ◽

Univariate Analyses

Background: Spinal computer-assisted navigation (CAN) is proven to increase instrumentation accuracy. Adoption remains limited by workflow restrictions, learning curves and costs. Here, we assess spinal CAN usage among Ontario surgeons to identify gaps in application, and temporal trends of usage. Methods: A prospectively-collected database of provincial insurance billables and diagnostic codes was reviewed retrospectively, from 2002-2014. Patients undergoing instrumented spinal fusions or percutaneous vertebroplasty/kyphoplasty were identified. Fee and diagnostic codes were applied to distinguish surgical indication and approach. The use of intra-operative navigation was determined for each case. Results: We identified 4607 instrumented spinal fusions in our cohort. Most cases were performed by orthopedic surgeons (63.2%) and the remainder by neurosurgeons. Of 2239 cases with identifiable etiology, CAN was utilized in 8.8%, predominantly for trauma and degenerative pathologies rather than deformity. In univariate analyses, CAN was used more often by neurosurgeons (21.0% vs. 12.4%, p<0.001), in academic institutions (15.9% vs. 12.3%, p<0.001), and when performed in/after 2010 (18.9% vs. 8.9%, p<0.001). Differences by specialty and year remained significant in multiple logistic regression. Conclusions: Spinal CAN has proven benefit for instrumentation accuracy, but is used preferentially by academic neurosurgeons. Significant gains must be made in cost and usability to improve access across disciplines and institutions.

Download Full-text

Computer-Assisted High-Re Solution TEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100179567 ◽

1990 ◽

Vol 48 (1) ◽

pp. 162-163

Author(s):

F.A. Ponce ◽

H. Hikashi

Keyword(s):

Signal To Noise Ratio ◽

Accurate Determination ◽

Computer Software ◽

Video Camera ◽

Image Contrast ◽

Objective Lens ◽

Computer Assisted ◽

Optical Parameters ◽

Astigmatism Correction

The determination of the atomic positions from HRTEM micrographs is only possible if the optical parameters are known to a certain accuracy, and reliable through-focus series are available to match the experimental images with calculated images of possible atomic models. The main limitation in interpreting images at the atomic level is the knowledge of the optical parameters such as beam alignment, astigmatism correction and defocus value. Under ordinary conditions, the uncertainty in these values is sufficiently large to prevent the accurate determination of the atomic positions. Therefore, in order to achieve the resolution power of the microscope (under 0.2nm) it is necessary to take extraordinary measures. The use of on line computers has been proposed [e.g.: 2-5] and used with certain amount of success.We have built a system that can perform operations in the range of one frame stored and analyzed per second. A schematic diagram of the system is shown in figure 1. A JEOL 4000EX microscope equipped with an external computer interface is directly linked to a SUN-3 computer. All electrical parameters in the microscope can be changed via this interface by the use of a set of commands. The image is received from a video camera. A commercial image processor improves the signal-to-noise ratio by recursively averaging with a time constant, usually set at 0.25 sec. The computer software is based on a multi-window system and is entirely mouse-driven. All operations can be performed by clicking the mouse on the appropiate windows and buttons. This capability leads to extreme friendliness, ease of operation, and high operator speeds. Image analysis can be done in various ways. Here, we have measured the image contrast and used it to optimize certain parameters. The system is designed to have instant access to: (a) x- and y- alignment coils, (b) x- and y- astigmatism correction coils, and (c) objective lens current. The algorithm is shown in figure 2. Figure 3 shows an example taken from a thin CdTe crystal. The image contrast is displayed for changing objective lens current (defocus value). The display is calibrated in angstroms. Images are stored on the disk and are accessible by clicking the data points in the graph. Some of the frame-store images are displayed in Fig. 4.

Download Full-text

Analyzing Language in Suicide Notes and Legacy Tokens

Crisis ◽

10.1027/0227-5910/a000363 ◽

2016 ◽

Vol 37 (2) ◽

pp. 140-147 ◽

Cited By ~ 6

Author(s):

Michael J. Egnoto ◽

Darrin J. Griffin

Keyword(s):

Text Analysis ◽

Low Cost ◽

Computer Software ◽

Student Writing ◽

Computer Assisted ◽

Automated Identification ◽

Completed Suicide ◽

Suicide Notes ◽

Self Harm ◽

Harm To Others

Abstract. Background: Identifying precursors that will aid in the discovery of individuals who may harm themselves or others has long been a focus of scholarly research. Aim: This work set out to determine if it is possible to use the legacy tokens of active shooters and notes left from individuals who completed suicide to uncover signals that foreshadow their behavior. Method: A total of 25 suicide notes and 21 legacy tokens were compared with a sample of over 20,000 student writings for a preliminary computer-assisted text analysis to determine what differences can be coded with existing computer software to better identify students who may commit self-harm or harm to others. Results: The results support that text analysis techniques with the Linguistic Inquiry and Word Count (LIWC) tool are effective for identifying suicidal or homicidal writings as distinct from each other and from a variety of student writings in an automated fashion. Conclusion: Findings indicate support for automated identification of writings that were associated with harm to self, harm to others, and various other student writing products. This work begins to uncover the viability or larger scale, low cost methods of automatic detection for individuals suffering from harmful ideation.

Download Full-text