International Biomechanics最新文献

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A stochastic structural reliability model explains rotator cuff repair retears 一个随机结构可靠性模型解释了肩袖修复损伤

International Biomechanics Pub Date : 2014-01-01 DOI: 10.1080/23310472.2014.983166

D. M. Donnell, Jessica L. Seidelman, C. Mendias, B. Miller, J. Carpenter, R. Hughes

{"title":"A stochastic structural reliability model explains rotator cuff repair retears","authors":"D. M. Donnell, Jessica L. Seidelman, C. Mendias, B. Miller, J. Carpenter, R. Hughes","doi":"10.1080/23310472.2014.983166","DOIUrl":"https://doi.org/10.1080/23310472.2014.983166","url":null,"abstract":"High rates of tendon retear following surgical repair of large rotator cuff tears have been reported. This study developed a probabilistic structural reliability model of retear with potential to guide quality improvement interventions. A probabilistic biomechanical model of survivorship from a recurrent tear, based on structural reliability and Markov processes, treated the capacity of the surgical repair to withstand tensile loading and the load applied by the supraspinatus muscle as independent lognormally distributed random variables. For a repair to remain intact at the end of the tth day, it had to remain intact on days 0, … , t − 1. After retear was predicted to occur, that repair remained torn in the model. The model predicted two-year survival of 75.7%, which is within the 95% confidence interval of the Kaplan–Meier for data reported by others. The model’s demonstrated prediction of retear can be used for improving repair survival: lowering the variance in both repair strength and in post-operative supraspinatus muscle loading is an effective method for lowering the retear rate. Variance reduction alone may be an effective way to improve surgical treatment of this disorder.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"1 1","pages":"29 - 35"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23310472.2014.983166","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60067292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Prediction of impact force in sideways fall by image-based subject-specific dynamics model 基于图像的受试者特定动力学模型预测侧身坠落的冲击力

International Biomechanics Pub Date : 2014-01-01 DOI: 10.1080/23310472.2014.975745

Yunhua Luo, M. Nasiri Sarvi, Pei-dong Sun, W. Leslie, J. Ouyang

{"title":"Prediction of impact force in sideways fall by image-based subject-specific dynamics model","authors":"Yunhua Luo, M. Nasiri Sarvi, Pei-dong Sun, W. Leslie, J. Ouyang","doi":"10.1080/23310472.2014.975745","DOIUrl":"https://doi.org/10.1080/23310472.2014.975745","url":null,"abstract":"The impact force applied to the greater trochanter during sideways fall is a critical factor for determining whether or not a hip fracture would occur. However, the impact force is subject-dependent as it is related to the subject’s anthropometric parameters and the kinematic variables in fall. It cannot be accurately predicted by the currently available dynamics models. We developed and validated a method for constructing subject-specific dynamics models to more accurately predict the impact force. The anthropometric parameters required in the model were obtained from the subject’s whole body DXA (dual energy X-ray absorptiometry) image. The subject-specific dynamics models were then validated by protected fall tests using young volunteers. The effects of anthropometric parameters on the impact force were investigated using 90 clinical DXA images obtained from a local osteoporosis clinic center. The impact forces predicted by subject-specific dynamics models had much better agreement with the experimental data, compared with those predicted by the existing empirical functions. The parametric study results indicated that although body weight and height are the dominant parameters affecting the impact force, other parameters such as the hip vertical velocity before impact also have considerable effects. This finding suggests that the existing empirical functions that only consider body weight and height may not be able to accurately predict the impact force. As whole body DXA images are readily available in osteoporosis clinic centers, the proposed method may have potential applications in the clinic to improve the assessment of fall-induced hip fracture risk.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"1 1","pages":"1 - 14"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23310472.2014.975745","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60067730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

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