Cartilage surface characterization by frictional dissipated energy during axially loaded knee flexion—An in vitro sheep model

Lorenz, Andrea; Rothstock, Stephan; Bobrowitsch, Evgenij; Beck, Alexander; Gruhler, Gerhard; Ipach, Ingmar; Leichtle, Ulf; Wülker, Nikolaus

doi:10.1016/j.jbiomech.2013.03.009

Cited by 19 publications

(25 citation statements)

References 22 publications

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“…In biomechanical testing, the described DE method has three main advantages: First we receive a natural testing environment by using the whole joint with all ligaments, menisci and the synovial fluid [13]. Other biomechanical studies concerning this topic are working without soft tissue [25] or with synthetic bone [26].…”

Section: Discussionmentioning

confidence: 99%

“…1). The settings of the robot used for previous studies with non human specimens [13] were adapted to the larger human knee joints. Fixation within aluminum cylinders in the robot, axes definition and recording of the passive path remained unchanged as described in previous studies [13,14].…”

Section: Robotmentioning

confidence: 99%

“…We had previously demonstrated in a sheep model, that different cartilage defect levels can be characterized by measuring the dissipated energy (DE) using a 6 degree of freedom robotic system [12]. Advantage of this experimental system is that it allows a friction calculation in a whole knee joint with the total joint surface and all friction properties in their individual joint environment including the ligaments and the synovial fluid [13]. Previous studies in our lab had established the DE as a suitable system to describe the friction properties in the knee joint [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Influence of reduction accuracy in lateral tibial plateau fractures on intra-articular friction – a biomechanical study

Beck

Jacob

Hofmann

et al. 2020

BMC Musculoskelet Disord

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Background: Lateral tibial split fractures (LTSF) usually require surgical therapy with screw or plate osteosynthesis. Excellent anatomical reduction of the fracture is thereby essential to avoid post-traumatic osteoarthritis. In clinical practice, a gap and step of 2 mm have been propagated as maximum tolerable limit. To date, biomechanical studies regarding tibial fractures have been limited to pressure measurement, but the relationship between dissipated energy (DE) as a friction parameter and reduction accuracy in LTSF has not been investigated. In past experiments, we developed a new method to measure DE in ovine knee joints. To determine weather non-anatomical fracture reduction with lateral gap or vertical step condition leads to relevant changes in DE in the human knee joint, we tested the applicability of the new method on human LTSFs and investigated whether the current limit of 2 mm gap and step is durable from a biomechanical point of view. Methods: Seven right human, native knee joint specimens were cyclically moved under 400 N axial load using a robotic system. During the cyclic motion, the flexion angle and the respective torque were recorded and the DE was calculated. First, DE was measured after an anterolateral approach had been performed (condition "native"). Then a LTSF was set with a chisel, reduced anatomically, fixed with two set screws and DE was measured ("even"). DE of further reductions was then measured with gaps of 1 mm and 2 mm, and a 2 mm step down or a 2 mm step up was measured. Results: We successfully established a measurement protocol for DE in human knee joints with LTSF. While gaps led to small though statistically significant increase (1 mm gap:ΔDE compared with native = 0.030 J/cycle, (+ 21%), p = 0.02; 2 mm gap:ΔDE = 0.032 J/cycle, (+ 22%), p = 0.009), this increase almost doubled when reducing in a stepdown condition (ΔDE = 0.058 J/cycle, (+ 56%), p = 0.042) and even tripled in the step-up condition (ΔDE = 0.097 J/ cycle, (+ 94%), p = 0.004). Conclusions: Based on our biomechanical findings, we suggest avoiding step conditions in the daily work in the operating theatre. Gap conditions can be handled a bit more generously.

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Section: Discussionmentioning

confidence: 99%

Section: Robotmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of reduction accuracy in lateral tibial plateau fractures on intra-articular friction – a biomechanical study

Beck

Jacob

Hofmann

et al. 2020

BMC Musculoskelet Disord

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“…Ni niej sza pra ca po twier dza do tych cza so we donie sie nia, iż drga nia ge ne ro wa ne przez po ru sza ją ce się wzglę dem sie bie po wierzch nie sta wo we po kry te zde ge ne ro wa ną chrząst ką ró żnią się istot nie w ampli tu dzie oraz czę sto tli wo ści od sta wów zdro wych [18,19]. Znaj du je to uza sad nie nie bio me cha nicz ne, gdyż w fi zjo lo gicz nych wa run kach pra wi dło wa bu dowa i funk cja struk tur sta wo wych opty ma li zu je współczyn nik tar cia pod czas po ru sza nia się po wierzch ni stawo wych [20]. Wa run ku je to płyn ność ru chu, któ rej od po wia da cha rak ter sy gna łu za re je stro wa ny dla grup kon tro l nych.…”

Section: Discussionunclassified

Vibroarthrography in the evaluation of musculoskeletal system – a pilot study

Bączkowicz¹,

Kręcisz²

2013

Ortop Traumatol Rehabil

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BACKGROUND. Disorders of the articular surfaces are associated with impaired quality of joint motion and joint play. Crepitations are the hallmark clinical sign. This paper aims to present the possibilities of using vibroacoustic signal analysis in assessing the function of articular surfaces in the course of disorders of the knee and shoulder. MATERIAL AND METHODS. The study involved 30 people, 10 for each of the following disorders: patellar chondromalacia (Ch), meniscal tears (Mc), and degenerative changes of the glenohumeral joint (GH). A control group (K1-K3) was matched to each dysfunctional group. 6-second vibroacoustic signals (VAG) were recorded during motion in particular joints. The resulting time series were filtered (50-1000 Hz) and the following parameters were calculated: variance-mean-square (VMS), the mean of the four lowest and four highest values (R4) and the total spectral power density in the 50-250 Hz (P1) and 250-450 Hz (P2) ranges. RESULTS. Depending on the type of disorder, VAG signals in the dysfunctional groups were characterized by higher variability, amplitude and frequency than was the case in the control groups. This is reflected in the values of all parameters (VMS, R4, P1, P2), which were significantly higher in the Ch, Mc and GH groups compared to K1-K3. CONCLUSIONS. 1. Vibroarthrography can be a useful tool for accurate and objective assessment of the quality of joint motion. 2. The non-invasive nature of vibroarthrography allows the use of this method to monitor the effects of the treatment of joint structures.

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“…From an arthrology perspective, this nding seems to be particularly important, because the load on articular surfaces is one of the most essential factors affecting the level of kinetic friction and joint wear [7,21]. Meanwhile, most of the previously presented research associated with analysis of load impact on articular friction and contact stress has been based on mathematical modelling or ex vivo analysis, which constitutes a considerable limitation in their clinical application [22][23][24][25][26][27][28]. Thus, it seems that a noninvasive method, such as vibroarthrography, might provide a new perspective on PFJ arthrokinematics analyzed in vivo.…”

Section: Introductionmentioning

confidence: 99%

Vibroarthrographic analysis of patellofemoral joint arthrokinematics during squats with increasing external loads

Ołowiana

Selkow

Laudner

et al. 2020

Preprint

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Background: The patellofemoral joint (PFJ) provides extremely low kinetic friction, which results in optimal arthrokinematic motion quality. Previous research showed that these friction-reducing properties may be diminished due to the increase in articular contact forces. However, this phenomenon has not been analyzed in vivo during functional daily-living activities. The aim of this study was the vibroarthrographic assessment of changes in PFJ arthrokinematics during squats with variated loads.Methods: 114 knees from 57 asymptomatic subjects (23 females and 34 males) whose ages ranged from 19 to 26 years were enrolled in this study. Participants were asked to perform 3 trials: 4 repetitions of bodyweight squats (L0), 4 repetitions of 10 kg barbell back loaded squats (L10), 4 repetitions of 20 kg barbell back loaded squats (L20). During the unloaded and loaded (L10, L20) squats, vibroarthrographic signals were collected using an accelerometer placed on the patella and were described by the following parameters: variation of mean square (VMS), mean range (R4), and power spectral density for frequency of 50-250 Hz (P1) and 250-450 Hz (P2).Results: Obtained results showed that the lowest values were noted in the unloaded condition and that the increased applied loads had a significant concomitant increase in all the aforementioned parameters bilaterally (p<0.05).Conclusion: This phenomenon indicates that the application of increasing knee loads during squats corresponds to higher intensity of vibroacoustic emission, which might be related to higher contact stress and kinetic friction as well as diminished arthrokinematic motion quality.

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Cartilage surface characterization by frictional dissipated energy during axially loaded knee flexion—An in vitro sheep model

Cited by 19 publications

References 22 publications

Influence of reduction accuracy in lateral tibial plateau fractures on intra-articular friction – a biomechanical study

Influence of reduction accuracy in lateral tibial plateau fractures on intra-articular friction – a biomechanical study

Vibroarthrography in the evaluation of musculoskeletal system – a pilot study

Vibroarthrographic analysis of patellofemoral joint arthrokinematics during squats with increasing external loads

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