scholarly journals NONLINEAR DYNAMIC CHARACTERISTICS OF LUMBAR DISC SUBJECTED TO STOCHASTIC EXCITATION

2021 ◽  
Author(s):  
FANG LIU ◽  
ZHI-WEN ZHU
Keyword(s):  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Dynamic Characteristics ◽  
Nonlinear Dynamic ◽  
Large Scale ◽  
Lumbar Disc ◽  
Complex Structure ◽  
Harmonic Balance Method ◽  
Periodic Movement ◽  
Set Up

The lumbar disc has complex structure and material properties, and if it develops disease, it cannot heal itself. Therefore, prevention of lumbar disc herniation is very important. In this paper, the model of lumbar disc is built, and the nonlinear dynamic response of the system is researched. A modified Van der Pol model is imported to describe the stress–strain curves of the lumbar disc. The system’s dynamic model is set up, and harmonic balance method is applied to revise the natural frequency of the system. The product of numerical simulation reveals that the lumbar disc has complex dynamic characteristics, including balance point, limit cycle bifurcation and stochastic Hopf bifurcation. By changing the parameters, we can avoid large-scale periodic movement of the lumbar disc which causes lumbar disc herniation. These results contribute to the prevention of lumbar disc herniation.

scholarly journals Body Mass Index and its Association with Lumbar Disc Herniation and Sciatica: A Large-Scale, Population-Based Study

2014 ◽  
Vol 4 (1_suppl) ◽  
pp. s-0034-1376593-s-0034-1376593
Author(s):  
D. Samartzis ◽  
J. Karppinen ◽  
K. DK Luk ◽  
K. MC Cheung
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Large Scale ◽  
Lumbar Disc ◽  
Population Based ◽  
Population Based Study ◽  
Scale Population

scholarly journals Comparative study of open versus endoscopic discectomy (Destandau technique) in lumbar disc herniation at a semi urban set-up

2020 ◽  
Vol 6 (2) ◽  
pp. 666-671
Author(s):  
Dr. Vimala Ambati ◽  
Dr. Kamesh Konchada ◽  
Dr. K Jagadeesh Babu ◽  
Dr. G. Malleswara rao ◽  
Dr. Chaitanya Juluru ◽  
...  
Keyword(s):  
Comparative Study ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Lumbar Disc ◽  
Endoscopic Discectomy ◽  
Set Up ◽  
Open Versus

scholarly journals A Protocol for Developing a Clinical Practice Guideline of Moxibustion in the Treatment of Lumbar Disc Herniation

2020 ◽  
Author(s):  
Fanghui Hua ◽  
Jun Xiong ◽  
Haifeng Zhang ◽  
Jie Xiang ◽  
Shouqiang Huang
Keyword(s):  
Clinical Practice ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Lumbar Disc ◽  
Institute Of Medicine ◽  
Registration Number ◽  
Nerve Root Pain ◽  
Patient Values ◽  
Set Up ◽  
High Level

Abstract Background: Lumbar disc herniation(LDH), as a disease with great disturbance to life and work, is known as the origin of the severe and disabling forms of nerve root pain. Recognized as an increasingly widely accepted treatment, the efficacy of moxibustion on LDH has been affirmed. However, clinical practice guidelines (CPG) for the treatment of LDH with moxibustion have not been developed. Therefore, we will carry out this work following the accepted methodological quality standards.Methods: The new CPG will be developed according to the Institute of Medicine (IOM), the Appraisal of Guidelines for Research & EvaluationⅡ (AGREEⅡ) and WHO guideline handbook. And then determine recommendations based on high-level evidence. We will set up a Guideline Working Group and define clinical issues according to the PICO principles (Population, Intervention, Comparison, Outcomes). After evidence syntheses and several rounds of Delphi process, we will reach the consensus. In making the guideline, Patient values or preferences, results of peer review, and interest statements are all within the bounds of what we must consider. Results: As the study is not yet complete, no results can be reported.Conclusion: So far, we will develop the first CPG for moxibustion of LDH strictly based on systematic methodologies in China. This CPG will establish the standard of LDH in moxibustion therapy.Registration number: IPGRP-2020CN034.

Recurrence Rate of Lumbar Disc Herniation After Standard Discectomy and Microdiscectomy: A 5-Year Study

2019 ◽  
Vol 12 (2) ◽  
pp. 139-146
Author(s):  
Mladen E. Ovcharov ◽  
Iliya V. Valkov ◽  
Milan N. Mladenovski ◽  
Nikolay V. Vasilev
Keyword(s):  
Recurrence Rate ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Lumbar Disc ◽  
Surgical Techniques ◽  
Reoperation Rate ◽  
University Hospital ◽  
Recurrence Rates ◽  
Chi Square ◽  
Common Procedure

Summary Lumbar disc herniation (LDH) is the most common pathology in young people, as well as people of active age. Despite sophisticated and new minimally invasive surgical techniques and approaches, reoperations for recurrent lumbar disc herniation (rLDH) could not be avoided. LDH recurrence rates, reported in different studies, range from 5 to 25%. The purpose of this study was to estimate the recurrence rates of LDH after standard discectomy (SD) and microdiscectomy (MD), and compare them to those reported in the literature. Retrospectively, operative reports for the period 2012-2017 were reviewed on LDH surgeries performed at the Neurosurgery Clinic of Dr Georgi Stranski University Hospital in Pleven. Five hundred eighty-nine single-level lumbar discectomies were performed by one neurosurgeon. The diagnoses of recurrent disc herniation were based on the development of new symptoms and magnetic resonance/computed tomography (MRI/CT) images showing compatible lesions in the same lumbar level as the primary lumbar discectomies. The recurrence rate was determined by using chi-square tests and directional measures. SD was the most common procedure (498 patients) followed by MD (91 patients). The cumulative reoperation rate for rLDH was 7.5%. From a total number of reoperations, 26 were males (59.1%) and 18 were females (40.9%). Reoperation rates were 7.6% and 6.6% after SD and MD respectively. The recurrence rate was not significantly higher for SD. Our recurrence rate was 7.5%, which makes it comparable with the rates of 5-25% reported in the literature.

EFFICACY OF ANTIBIOTICS PROPHYLAXIS IN PATIENTS WITH LUMBAR DISC HERNIATION UNDERGOING LUMBAR DISCETOMY

2018 ◽  
Vol 8 (5) ◽  
pp. 14-19
Author(s):  
Tri Truong Van ◽  
Tri Tran Duc Duy ◽  
Khai Vo Le Quang
Keyword(s):  
Surgical Site Infection ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Lumbar Disc ◽  
Lumbar Discectomy ◽  
University Hospital ◽  
Site Infection ◽  
Surgical Wound ◽  
A Prospective Study ◽  
Length Of Hospitalization

Introduction: Surgical wound infection in developing coutries is about 3%. Antibiotics prophylaxis may help to reduce the surgical site infection. The objective of this study was to evaluate the efficacy of antibiotics prophylaxis in patients with lumbar disc herniation who were treated with lumbar discectomy at Hue University hospital. Materials and Methods: A prospective study was conducted at Hue University hospital from March 2015 to May 2018 on 54 patients with lumbar disc herniation who were used antibiotics prophylaxis when undergoing discectomy. Results: The infection rate in our study was 0%. Antibiotics prophylaxis reduced the length of hospitalization as well as the medical cost. Conclusion: Antibiotics prophylaxis was effective in preventing surgical site infection despite the fact that the condition of operating rooms did not meet the standard rules. Key words: prophylaxis antibiotics, lumbar disc herniation

Sign in / Sign up

Export Citation Format

Share Document