Študija je osredinjena na tri ligamente, ki stabilizirajo vratno hrbtenico in ščitijo hrbtenjačo – ALL, PLL in LF. Sveži vzorci vratne hrbtenice so bili preizkušeni v fizioloških pogojih, pri dveh hitrostih obremenitve pod natezno obremenitvijo v smeri vlakenc. Ugotovljen je bil vpliv hitrosti deformacije na višjo porušitveno trdnost in napetost, togost in Youngov modul, vendar vpliv ni pomemben za vse tipe ligamentov. Hitrost obremenitve ima največji vpliv na porušitveno trdnost za vse tri ligamente (povprečno 39,9% zvišanje). Ugotovitve študije implicirajo več pozornosti pri uporabi obstoječih eksperimentalnih podatkov iz literature pri numeričnem modeliranju.
COBISS.SI-ID: 13527579
Cervical spine ligaments have an important role in providing spinal cord stability and restricting excessive movements. Therefore, it is of great importance to study mechanical properties and model the response of these ligaments. The aim of this study is to characterize ageing effects on failure properties and model the damage of three cervical spine ligaments ALL, PLL and LF. A total of 46 samples of human cadaveric ligaments removed within 24-48 hours after death have been tested. Uniaxial tension tests along fibre direction were performed in physiological conditions. The results showed that ageing decreased failure properties of all three ligaments (failure load, failure elongation). Reported non-linear response of cervical ligaments has been modelled with a combination of the previously reported hyperelastic and damage model for soft tissues.
COBISS.SI-ID: 13356827
Whiplash injuries to the cervical spine represent a considerable economic burden on society with medical conditions, in some cases persisting for more than a year. Numerous studies of whiplash injuries have been made for occupant normal seated position, leaving the analysis of neck injuries for out-of-normal positions not well documented. For that purpose, a detailed human cervical spine finite element model was developed. The analysis was made for four most common occupant seated positions. The comparative study included the analysis of four cervical spine ligaments and deformation and the level of S-curvature of the cervical spine. The model developed predicted that the Head Flexed seated position and Head-Flexed with Torso Lean forward seated position are most threatening for upper and lower cervical spine capsular ligament, respectively. As for the level of S-curvature, the model predicted that the Head-Flexed with Torso Lean forward seated position would be most prone to neck injuries associated with it. This study demonstrated that the occupant seated position has a significant influence on potential whiplash injuries.
COBISS.SI-ID: 14935579
Cartilage lesions have a high impact on the quality of life. The greater emphasis on physical activity in all age groups is responsible for the growing rate of these lesions, which are caused by trauma, overuse, or favored by several other factors. Recently, the osteochondral scaffolds were introduced into surgical treatment for large chondral lesions in knee joints. The cadaveric study showed that fibrin glue notably improved collagen-hydroxyapatite osteochondral scaffold fixation and integrity, which contributes to earlier and better rehabilitation after surgical treatment.
COBISS.SI-ID: 31248857
Due to the increasing number of traffic accidents involving the collisions of vehicles with the emergency-stop-area head walls in tunnels, a comparative numerical analysis in accordance with the EN 1317 standard has been performed in order to assess the quality of the available protective safety barriers. Based on the simulation results, the values of the relevant injury criteria – the Acceleration Severity Index (ASI), the Theoretical Head Impact Velocity (THIV) and the Post-Impact Head Deceleration (PHD) – were computed for several collision scenarios involving two different passenger vehicles colliding with two different safety barriers in various ways. The results show that due to the geometrical restrictions in the tunnel’s emergency stop area none of the barriers can provide total protection for the occupants of the vehicle in the event of a collision. The installation of a steel-sheet-tube crash cushion was, however, found to provide the best possible protection within the given limitations. The results of the analysis were the basis for selecting a safety-barrier design for the existing tunnel installations and for the proposed changes in regulations governing the geometry of the tunnel’s emergency stop area. The proposed safety-barries are installed in all Slovenian tunnels.
COBISS.SI-ID: 13216027