Journal of biomechanics最新文献_第2页

Decreasing postural stability after trunk perturbation is related to altered muscle activity in patients with chronic ankle instability 慢性踝关节不稳定患者躯干扰动后姿势稳定性下降与肌肉活动改变有关。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-13 DOI: 10.1016/j.jbiomech.2026.113524

Shinshiro Mineta, Minori Mitsui, Takashi Sudo, Tomoki Ebato

{"title":"Decreasing postural stability after trunk perturbation is related to altered muscle activity in patients with chronic ankle instability","authors":"Shinshiro Mineta, Minori Mitsui, Takashi Sudo, Tomoki Ebato","doi":"10.1016/j.jbiomech.2026.113524","DOIUrl":"10.1016/j.jbiomech.2026.113524","url":null,"abstract":"<div><div>Approximately 47% of lateral ankle sprains (LASs) occur via indirect contact; therefore, clarifying postural control after external contact to the trunk may provide valuable insights into LAS prevention. In the present study, kinematics, kinetics, and muscle activity were measured during a stepping task following trunk perturbation. Kinematics and muscle activity were analyzed before and after both perturbation and initial contact (IC), whereas kinetics were analyzed only before and after IC. The anterior–posterior stability index, medial–lateral stability index (MLSI), and maximum lateral center of pressure (COP) displacement were calculated as stability outcomes. Co-contraction indices (CCIs) were calculated to assess muscle coactivation. Group differences were analyzed using independent t-tests, Mann–Whitney U tests, or statistical parametric mapping for time-series data. Relationships between stability outcomes and muscle activity were examined using multiple regression analysis. The CAI group exhibited significantly higher MLSI and COP lateral displacement, and significantly lower tibialis anterior (TA)/TA + gastrocnemius medialis (GasM) and TA/TA + gastrocnemius lateralis (GasL) co-contraction indices. The analyses revealed several significant group differences and associations. GasM root mean square (RMS) before IC was also significantly higher. Increased MLSI was associated with delayed peroneus longus (PL) onset; COP displacement was related to PL/PL + TA CCI, PL RMS before IC, and delayed GasL onset. These findings indicate that individuals with CAI exhibit impaired postural stability during post-perturbation stepping responses following external contact to the trunk, accompanied by altered ankle muscle activation. Perturbation-based training targeting foot stability and coordinated ankle muscle activation may be important for LAS prevention and rehabilitation.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113524"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148808646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hemodynamic effects of hemodialysis catheter tip position on recirculation and thrombosis-related flow indices in a physiologic right atrial model 血透导管尖端位置对生理性右心房再循环及血栓相关血流指标的血流动力学影响

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-19 DOI: 10.1016/j.jbiomech.2026.113536

Yang Yang, Chang Ruan, Hanji Gong, Chen Liu, Zhifeng Zhou, Yu Chen, Yan Xiong, Zhuang Liu, Ling Zhang

{"title":"Hemodynamic effects of hemodialysis catheter tip position on recirculation and thrombosis-related flow indices in a physiologic right atrial model","authors":"Yang Yang, Chang Ruan, Hanji Gong, Chen Liu, Zhifeng Zhou, Yu Chen, Yan Xiong, Zhuang Liu, Ling Zhang","doi":"10.1016/j.jbiomech.2026.113536","DOIUrl":"10.1016/j.jbiomech.2026.113536","url":null,"abstract":"<div><div>Hemodialysis catheter dysfunction remains a major challenge in end-stage renal disease because thrombogenesis and elevated recirculation can reduce access performance. Catheter tip location in the superior vena cava (SVC), cavoatrial junction (CAJ), or right atrium (RA) affects local hemodynamics, but the optimal position remains uncertain in physiologically realistic models. In this study, a high-fidelity right atrial computational fluid dynamics model was developed to evaluate stepped-tip catheters at three placement locations and five arteriovenous (A/V) offsets (20–30 mm). Recirculation ratio was quantified using particle tracking, and thrombosis-related hemodynamic descriptors, including time-averaged wall shear stress (TAWSS), oscillatory shear index (OSI), relative residence time (RRT), blood stasis volume, and platelet activation state (PAS), were assessed. Recirculation varied with A/V offset and increased with decreasing dialysis flow rate, rising from 13.11% at 20 mm to 14.21% at 30 mm and from 12.81% at 400 mL/min to 13.04% at 300 mL/min. SVC placement produced the lowest recirculation ratio (10.96%), whereas RA placement produced the highest (13.53%). However, CAJ placement showed the most balanced hemodynamic profile, with near-physiological TAWSS, the lowest high-OSI burden among catheterized cases, and intermediate RRT. These results suggest that catheter tip position should be evaluated by balancing dialysis efficiency against thrombosis-related flow disturbance rather than by minimizing recirculation alone. Within the present model, CAJ provided the most favorable overall compromise.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113536"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148813145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energetic phenotyping in heart failure: From Starling curves to composite variables 心力衰竭的能量表型：从斯塔林曲线到复合变量。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-27 DOI: 10.1016/j.jbiomech.2026.113546

Pablo J. Blanco, Rohan Goswami, Ryo Torii, Héctor M. García-García, Jonathan Grinstein

{"title":"Energetic phenotyping in heart failure: From Starling curves to composite variables","authors":"Pablo J. Blanco, Rohan Goswami, Ryo Torii, Héctor M. García-García, Jonathan Grinstein","doi":"10.1016/j.jbiomech.2026.113546","DOIUrl":"10.1016/j.jbiomech.2026.113546","url":null,"abstract":"<div><div>Despite advances in treatment, mortality rates for advanced heart failure and cardiogenic shock remain unchanged due to delays in identifying shock types and challenges in choosing the right therapy. Accurate patient phenotyping can help clarify the patient’s condition and guide better treatment. In this study, we used in silico modeling to investigate the dynamic relationships among power, efficiency, and the shock phenotype in six advanced heart failure hypothetical phenotypes and a healthy control. We simulated phenotype-specific Starling curves by changing volume loading. We calculated advanced hemodynamic and energetic variables–pulsatility index, power output, myocardial performance score, and efficiency for the left and right ventricles. We proposed composite cardiac indices for energetic phenotyping. Adding a dynamic energetic assessment with volume loading showed that cardiac efficiency limits cardiac performance in each heart failure phenotype, but not in healthy controls. Advanced hemodynamic and energetic phenotyping–both at rest and during volume loading–especially with biventricular assessment, can accurately distinguish clinical shock phenotypes. This approach offers mechanistic insight into the causes of cardiac underperformance and helps guide optimal therapeutic interventions.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113546"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148874289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of preservation on the tensile properties and structure of the meniscus 保存对半月板拉伸性能和结构的影响。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-27 DOI: 10.1016/j.jbiomech.2026.113545

Chester Jar, Abbi Oguchi, Mohammadhamed Shahsavari, Nadr M. Jomha, Lindsey Westover, Gail M. Thornton

{"title":"Effects of preservation on the tensile properties and structure of the meniscus","authors":"Chester Jar, Abbi Oguchi, Mohammadhamed Shahsavari, Nadr M. Jomha, Lindsey Westover, Gail M. Thornton","doi":"10.1016/j.jbiomech.2026.113545","DOIUrl":"10.1016/j.jbiomech.2026.113545","url":null,"abstract":"<div><div>Meniscus allografts must be transplanted shortly after harvest or be preserved until transplantation, typically by freezing. However, the effects of preservation on the structure–function relationship of the meniscus are not well understood. The objective of this study was to propose a physical mechanism by which preservation affects the tensile properties of the meniscus. It is hypothesized that the separation of collagen fibres from voids formed during freezing and fresh storage decrease tensile strength and modulus.</div><div>Medial and lateral porcine menisci were dissected on the day of slaughter and allocated into four groups: processed immediately (controls), fresh storage (4 °C, 21 days), or frozen with (−140 °C, 21 days) and without cryoprotectant (−80 °C, 21 days). Tensile tests were performed in the circumferential and radial directions to measure tensile modulus, ultimate tensile strength (UTS), and ultimate strain in the circumferential and radial directions. Area void fractions of collagen fibre bundles were estimated from scanning electron microscopy images.</div><div>All preservation groups had a significantly lower modulus, UTS and a significantly greater void fraction than controls. Menisci frozen with cryoprotectant had a significantly greater modulus, UTS and a significantly lower void fraction than those frozen without. No significant differences in mechanical or structural properties were found between the freezing without cryoprotectant and fresh storage groups.</div><div>Decreases in tensile properties may result from interfibrillar changes such as fibril spacing and crosslinking. Future tensile studies should include dynamic mechanical analysis, physiological strain rates, and a physically representative material model.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113545"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148874294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-vivo validation of a high-speed biplane videoradiography pipeline for foot and ankle joint kinematics 足部和踝关节运动学的高速双翼放射成像管道的体内验证。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-22 DOI: 10.1016/j.jbiomech.2026.113541

Robert Chauvet, Emily Bangsboll, Tomasz Bugajski, Anton Arndt, W. Brent Edwards, Koren E. Roach

{"title":"In-vivo validation of a high-speed biplane videoradiography pipeline for foot and ankle joint kinematics","authors":"Robert Chauvet, Emily Bangsboll, Tomasz Bugajski, Anton Arndt, W. Brent Edwards, Koren E. Roach","doi":"10.1016/j.jbiomech.2026.113541","DOIUrl":"10.1016/j.jbiomech.2026.113541","url":null,"abstract":"<div><div>Pathological ankle conditions alter joint kinematics and contribute to degeneration in adjacent hindfoot and midfoot joints. Accurate in-vivo assessment of these motions is essential for understanding disease progression and guiding clinical interventions. Biplane videoradiography (BVR) is a tool for six-degree-of-freedom in-vivo bone kinematics, but validation against gold-standard radiostereometric analysis (RSA) is needed for each new joint of interest and BVR configuration.</div><div>This study validated a BVR system using one participant instrumented with tantalum beads in the tibia, fibula, talus, calcaneus, cuboid, and navicular. Dynamic imaging was acquired during walking, step-up, step-down, and heel rise. Bone motions were tracked using model-based tracking (MBT) and compared to RSA. Root mean square (RMS) error and coefficient of multiple correlation analyses quantified accuracy and inter-/intra-rater variability, respectively.</div><div>The mean angular MBT RMS error was 1.37 ± 0.23° across all joints. The greatest error was 1.66 ± 0.19° in the talonavicular joint and the smallest error was 0.97 ± 0.19° in the subtalar joint. The mean translational MBT RMS error was 2.05 ± 0.58 mm across all joints. The greatest error was 2.83 ± 0.21 mm in the calcaneocuboid joint, while the smallest error was 1.20 ± 0.29 mm in the subtalar joint. The coefficient of multiple correlations scores for intra-rater repeatability ranged from 0.545 to 0.996. Joint accuracy errors are more clinically relevant and exceeded bone accuracy errors, reflecting compounded tracking of multiple bones. These findings indicate that BVR MBT is accurate in assessing foot and ankle kinematics and can be translated to pathological research.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113541"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148850769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiscale modeling of vascular adaptation: methodological advances and open challenges 血管适应的多尺度建模：方法学的进步和开放的挑战。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-06-22 DOI: 10.1016/j.jbiomech.2026.113431

Anna Corti, Stéphane Avril, Victor H. Barocas, Claudio Chiastra

引用次数: 0

Density-dependent occlusion performance of a hydrosalpinx occluder: Hydrodynamic and in vivo evaluation 输卵管积水闭塞器的密度依赖性闭塞性能：流体动力学和体内评价。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-26 DOI: 10.1016/j.jbiomech.2026.113544

Yiran Wang, Shenwen Jin, Wentao Jiang, Ming Zhang, Yu Chen, Fei Gao, Xiao Tang, Lingjun Liu, Zhongyou Li

{"title":"Density-dependent occlusion performance of a hydrosalpinx occluder: Hydrodynamic and in vivo evaluation","authors":"Yiran Wang, Shenwen Jin, Wentao Jiang, Ming Zhang, Yu Chen, Fei Gao, Xiao Tang, Lingjun Liu, Zhongyou Li","doi":"10.1016/j.jbiomech.2026.113544","DOIUrl":"10.1016/j.jbiomech.2026.113544","url":null,"abstract":"<div><div>Hydrosalpinx significantly reduces the success rate of in vitro fertilization–embryo transfer; however, the absence of dedicated tubal occlusion devices in current clinical practice limits the standardization of its treatment. Here, we designed and fabricated a dual-disc shape-memory alloy occluder for interventional embolization of hydrosalpinx, with structural density defined as the circumferential wire coverage fraction (48–96 NiTi wires across three configurations). The effects of structural density on occlusion performance and inflammatory response were systematically investigated through in vitro hydrodynamic testing and in vivo animal experiments. The results demonstrated that occlusion efficacy increased with structural density. Compared with a single occluder, double occluders exhibited more stable flow attenuation performance and reduced the equivalent permeability by 39.3 %. Histological evaluation indicated that all device configurations induced mild inflammatory responses; however, no observable aggravation of inflammation was associated with increasing structural density. Collectively, this study presents a shape-memory alloy-based occlusion strategy for hydrosalpinx and provides quantitative biomechanical evidence linking structural architecture to flow-resistance behavior, offering a potential engineering basis for device optimization and future translational development.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113544"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148850762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of muscle deactivation in the kinematic responses of cervical spine under emergency ejection – Finite element simulation 紧急弹射下颈椎运动反应中肌肉失活的影响-有限元模拟。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-28 DOI: 10.1016/j.jbiomech.2026.113548

Jun Wen, Xiaopan Hu, Minjun Liang, Ee-Chon Teo, Zilong Lu, Enze Shao, Yaodong Gu, Jianjun Lin

{"title":"Effect of muscle deactivation in the kinematic responses of cervical spine under emergency ejection – Finite element simulation","authors":"Jun Wen, Xiaopan Hu, Minjun Liang, Ee-Chon Teo, Zilong Lu, Enze Shao, Yaodong Gu, Jianjun Lin","doi":"10.1016/j.jbiomech.2026.113548","DOIUrl":"10.1016/j.jbiomech.2026.113548","url":null,"abstract":"<div><div>The cervical spine is highly vulnerable to injury during high-acceleration emergency ejection because of its flexibility, head–torso inertial lag, and dependence on coordinated muscle function. This study investigated the biomechanical effects of selective neck muscle deactivation on cervical spine kinematics under vertical acceleration loading using a validated C0–T1 finite element model based on a Hill-type muscle model. A 10-G vertical acceleration was applied, and individual muscle deactivation was simulated by reducing muscle activation to 0.005 at 80 ms. The results showed all muscular effects became prominent after 100 ms. Among the 12 neck muscle deactivations, longus capitis, semispinalis capitis, trapezius, splenius capitis, and scalenus anterior produced substantial alterations in upper cervical (C0–C2) and global cervical (C0–C7) motion patterns. Rotation analysis showed C0–C3 flexion and C3–C7 extension, forming S-shaped and C-shaped curvatures during 0–100 ms and 100–150 ms, respectively. Except under longus capitis deactivation, rapid motion reversal of flexion to extension at approximately 135 ms, the entire cervical C0-C7 segments formed two unique S- and C-shaped curvatures in the loading phase, with a 27.5% reduction in overall C0–C7 flexion of overall C0-C7 segment. These motion patterns caused stress concentration and altered load transfer at the C2–C3 and C6–C7 intervertebral discs and elongation of ligaments. The findings highlight the critical role of coordinated neck muscle function in cervical spine stability during high-G ejection and may contribute to the development of targeted muscle training and protective cockpit systems.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113548"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148865103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting tibia and fibula geometry from shank surface skin in a paediatric population 从儿童人群小腿表面皮肤预测胫骨和腓骨几何形状。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-28 DOI: 10.1016/j.jbiomech.2026.113549

Enzo Allevard, Thor F. Besier, Julie Choisne

{"title":"Predicting tibia and fibula geometry from shank surface skin in a paediatric population","authors":"Enzo Allevard, Thor F. Besier, Julie Choisne","doi":"10.1016/j.jbiomech.2026.113549","DOIUrl":"10.1016/j.jbiomech.2026.113549","url":null,"abstract":"<div><div>Musculoskeletal model generation often requires scaling a generic adult skeleton, which is fast but generally inaccurate. Statistical shape models have been developed to scale musculoskeletal models based on the population of interest, improving personalisation. Low-cost 3D surface scanning presents a new opportunity to scale musculoskeletal models directly from external body shape, such as SKEL. This study assessed the accuracy of 1) a combined shape model to predict tibia/fibula geometry from skin surface in a typically developed paediatric population and 2) the output from the generic scaling through SKEL. The left tibia/fibula bones and shank skin surface were segmented from 318 full-body CT scans. Principal component analysis captured the combined morphological variations between the shank surface and tibia/fibula geometry. A combined shape model was then developed to predict tibia/fibula geometry from the external shank surface using Principal Component fitting. The model was validated using a leave-one-out analysis. The combined shape model predicted the tibia and fibula with a root-mean-square error of 2.00 ± 0.90 mm, whereas the surface error from SKEL fitting was 2.98 ± 0.62 mm. Clinical bone measurement derived from predicted bones showed low error when compared to the segmented bones, except for tibial length and the mechanical medial proximal tibial angle. These results were repeatable across three prediction rounds, demonstrating robust and accurate prediction of bone shape and clinical measurements from the external skin surface. This proof-of-concept demonstrates the feasibility of inferring bones from the skin, paving the way for full-body models to enhance paediatric clinical gait analysis.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113549"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148865151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of an isokinetic knee extension maximum effort task on patellar tendon properties: An ultrasound B-mode and shear wave elastography approach 等速膝关节伸展最大努力任务对髌骨肌腱特性的影响：超声b型和横波弹性成像方法。

IF 2.9 3区医学

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-31 DOI: 10.1016/j.jbiomech.2026.113553

Heinrich Leon Souza Viera, Mateus Rossato, Daniela Lopes dos Santos, Fábio Juner Lanferdini

{"title":"Effects of an isokinetic knee extension maximum effort task on patellar tendon properties: An ultrasound B-mode and shear wave elastography approach","authors":"Heinrich Leon Souza Viera, Mateus Rossato, Daniela Lopes dos Santos, Fábio Juner Lanferdini","doi":"10.1016/j.jbiomech.2026.113553","DOIUrl":"10.1016/j.jbiomech.2026.113553","url":null,"abstract":"<div><div>Acute alterations on patellar tendon properties following an isokinetic knee extension task with a fatigue protocol remains unknown. To investigate this, nineteen (11♂, 8♀) physically active individuals participated in this study. Patellar tendon was assessed using ultrasonography in B-mode and shear wave elastography modes with the knee at 30° of flexion (0° = full extension). Tendon and subcutaneous fat tissue thickness, and echo intensity (EI) were analyzed from the extended field of view B-mode images. Mean shear wave velocity (SWV) was analyzed from the SWE images. This process was performed before and immediately after the isokinetic task, which included a fatigue protocol. Mechanical work was calculated for the first and last five repetitions to assess performance fatigability. Pre–post comparisons were performed using paired t-tests, and correlations between tendon EI and SWV were assessed using Pearson’s correlation. Reliability was evaluated using the intraclass correlation coefficient (ICC), standard error of measurement (SEM) and minimum detectable change (MDC). Statistical significance was set at α = 0.05, and Cohen’s d was calculated for effect size. While no differences in tendon thickness were observed (p = 0.208), EI increased 9% (p < 0.001, ES = 0.73) and SWV decreased 5% (p = 0.031, ES = 0.23) after the isokinetic task. Although EI and SWV correlated before the isokinetic task (r = 0.468, p = 0.043), no correlations were observed after it (r = 0.279, p = 0.247) and between EI and SWV variation (r = -0.419, p = 0.074). Very high reliability was seen before and after the isokinetic task (ICC ≥ 0.922, p < 0.001). However, SWV mean difference pre-post task was lower than MDC.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113553"},"PeriodicalIF":2.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148880204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0