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Instantaneous center rotation cervical spine

René Jonas, Robert Demmelmaier, Steffen P Hacker, Hans-Joachim Wilke
BACKGROUND CONTEXT: The range of motion is a well-accepted parameter for the assessment and evaluation of cervical motion. However, more qualitative data of the kinematics of the cervical spine are needed for the development and success of cervical disc arthroplasty. PURPOSE: The aim of this study was to provide basic information about helical axes of human cervical spine under in vitro conditions. Furthermore, it should clarify whether the three-dimensional helical axes of cervical motion gained from in vitro experiments are in agreement with those gained from in vivo experiments, and therefore to prove its reliability...
March 2018: Spine Journal: Official Journal of the North American Spine Society
Hao Diao, Hua Xin, Jun Dong, Xijing He, Dichen Li, Zhongmin Jin
STUDY DESIGN: A cervical spine biomechanical investigation using multibody dynamics. OBJECTIVE: To develop a comprehensive cervical spine multibody dynamics model incorporated with the force-dependent kinematics (FDK) approach, and to study the influence of soft tissue deformation on the joint loading prediction. SUMMARY OF BACKGROUND DATA: Musculoskeletal multibody dynamics models have been widely used to analyze joint loading. Current cervical spine musculoskeletal models, however, neglect the joint internal motion caused by soft tissue deformation...
December 15, 2017: Spine
Baoge Liu, Zheng Zeng, Tom Van Hoof, Jean Pierre Kalala, Zhenyu Liu, Bingxuan Wu
BACKGROUND: Multi-level cervical degeneration of the spine is a common clinical pathology that is often repaired by anterior cervical discectomy and fusion (ACDF). The aim of this study was to investigate the kinematics of the cervical spine after hybrid surgery compared with 2-level ACDF. MATERIAL AND METHODS: Five freshly frozen, unembalmed whole human cadavers were used including 3 males and 2 females with a mean age of 51 ± 8 years. After evaluating the intact spine for range of motion (ROM), sagittal alignment and instantaneous center of rotation (ICR), each cadaver underwent 4 consecutive surgeries: 2-level artificial disc replacement (ADR) from C4 to C6 (ADR surgery); 2-level ACDF from C4 to C6 (ACDF surgery); hybrid C4-5 ACDF and C5-6 ADR (ACDF+ADR surgery); and hybrid C4-5 ADR and C5-6 ACDF (ADR+ACDF surgery)...
April 8, 2015: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Zhen-Yu Liu, Bao-Ge Liu, Xin Lin
OBJECTIVE: To clarify the effectiveness of Chinese herbal fomentation in treating chronic neck pain by means of changes in cervical kinematics. METHODS: Seventy-six patients with chronic neck pain were included in the study and were randomized into two groups based on the random number generator of the SPSS software: fomentation combined with Chinese herbal (Group 1) and fomentation without any medicine (Group 2). In both groups, the fomentation lasted for 60 min and heated to 35 °C, once a day for 28 consecutive days...
December 2014: Chinese Journal of Integrative Medicine
Baoge Liu, Zhenyu Liu, Tom VanHoof, JeanPierre Kalala, Zheng Zeng, Xin Lin
PURPOSE: We located the instantaneous center of rotation (ICR) for the cervical spine at various ages and investigated age-related changes. We evaluated the impact of cervical disc degeneration on the ICR using a scoring system based on plain radiographs. METHODS: Flexion, extension, and neutral lateral radiographs were obtained from 680 asymptomatic subjects (363 men, 317 women; ages 20-79 years) divided into six 10-year-age groups. The ICRs from C3/C4 to C6/C7 were determined from the radiographs using MIMICS software...
November 2014: European Spine Journal
Fabio Galbusera, Chiara M Bellini, Manuela T Raimondi, Maurizio Fornari, Roberto Assietti
This study presents a finite element model of the C4-C7 segment in healthy conditions and after implantation of a disc prosthesis at a single level, in order to investigate of the influence of disc arthroplasty on the biomechanics of the cervical spine. A nonlinear finite element model of the C4-C7 segment in intact conditions was developed and run in flexion and extension. A detailed model of the Bryan disc prosthesis, including contacts between the different components of the device, was built and positioned at C5-C6...
November 2008: Medical Engineering & Physics
F Galbusera, A Fantigrossi, M T Raimondi, M Sassi, M Fornari, R Assietti
The study consists of a biomechanical comparison between the intact C5-C6 spinal segment and the same segment implanted with the Bryan artificial disc prosthesis (Medtronic Ltd., Memphis, TN, USA), by the use of the finite element (FE) method. Our target is the prediction of the influence of prosthesis placement on the resulting mechanics of the C5-C6 spine unit. A FE model of the intact C5-C6 segment was built, employing realistic models of the vertebrae, disc and ligaments. Simulations were conducted imposing a compression preload combined to a flexion/extension moment, a pure lateral bending moment and a pure torsion moment, and the calculated results were compared to data from literature...
November 2006: Biomechanics and Modeling in Mechanobiology
S W Lee, E R Draper, S P Hughes
STUDY DESIGN: This study was designed to investigate flexion and extension of the cervical spine in patients with "instability" of the cervical spine. OBJECTIVES: To establish a new method of calculating the instantaneous center of rotation (ICR) of the skull relative to the thorax and to compare the differences in the ICR between normal volunteers and patients. SUMMARY OF BACKGROUND DATA: "Instability" of the cervical spine commonly is investigated using functional radiographs, which is an unreliable method...
March 15, 1997: Spine
H van Mameren, H Sanches, J Beursgens, J Drukker
Anteflexion and retroflexion movements of the cervical spine were recorded cineradiographically during three measuring sessions to determine reproducibility as well as intraindividual and interindividual variability of segmental instantaneous centers of rotation (recorded as "averaged" and "standard"). Segmental averaged instantaneous centers of rotation were based on data obtained from all frames of the cineradiographic film by the use of the average pentagon and moving average method. Only the first and last frame were used to construct the segmental standard instantaneous centers of rotation...
May 1992: Spine
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