The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Frederick A Matsen - One of the best experts on this subject based on the ideXlab platform.
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What can be learned from an analysis of 215 glenoid Component Failures
Journal of Shoulder and Elbow Surgery, 2018Co-Authors: Daniel J. Hackett, Kiet V. Vo, Frederick A MatsenAbstract:Background Glenoid Component Failure is a prevalent mechanical complication of anatomic total shoulder arthroplasty. The objective of this study was to identify surgeon-controlled factors that may be addressed to reduce the rate of glenoid Component Failure that is sufficiently symptomatic to merit surgical revision. Methods We reviewed the clinical and radiographic features of 215 total shoulder arthroplasties that we revised for symptomatic glenoid Component Failure. Results Glenoid Component Failure was associated with poor patient self-assessed shoulder function (mean Simple Shoulder Test score, 3.0 ± 2.7). These shoulders often showed multiple Failure modes; 72% had glenoid Component loosening, 69% had polyethylene wear, 51% had glenohumeral decentering, and 25% had humeral Component loosening. Metal-backed/hybrid and keeled glenoid designs had higher rates of loosening (P = .010), malposition (P = .007), dislocation (P Conclusions Glenoid Component Failure remains a major cause of poor patient outcomes after total shoulder arthroplasty. The occurrence of severe glenoid Component Failure might be reduced by paying attention to glenoid Component design and insertion technique, restoring the normal balance of the humeral head in the center of the glenoid, and considering a reverse total shoulder when the shoulder is unstable because of soft tissue deficiency.
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Failure of the glenoid Component in anatomic total shoulder arthroplasty
Journal of Bone and Joint Surgery American Volume, 2013Co-Authors: Anastasios Papadonikolakis, Moni B Neradilek, Frederick A MatsenAbstract:Background: Although glenoid Component Failure is one of the most common complications of anatomic total shoulder arthroplasty, substantial evidence from the recent published literature is lacking regarding the temporal trend in the rate of this complication and the risk factors for its occurrence. Methods: We conducted a systematic review and identified twenty-seven articles presenting data on glenoid Component Failure rates that met the inclusion criteria. These articles represented data from 3853 total shoulder arthroplasties performed from 1976 to 2007. Results: Asymptomatic radiolucent lines occurred at a rate of 7.3% per year after the primary shoulder replacement. Symptomatic glenoid loosening occurred at 1.2% per year, and surgical revision occurred at 0.8% per year. There was no significant evidence that the rate of symptomatic loosening has diminished over time. Keeled Components had greater rates of asymptomatic radiolucent lines compared with pegged Components in side-by-side comparison studies. However, as a result of wide variability in outcomes reporting, only sex, Walch class, and diagnosis were significantly associated with the risk of glenoid Component Failure in the overall analysis. Conclusions: This is the first systematic review of the published evidence on glenoid Component Failure. Although the authors of individual articles proposed various risk factors for glenoid Component Failure, many of these relationships were not significant in the present study. A consistent methodological approach to future investigations is likely to improve the quality of the evidence on which patients, techniques, and prostheses are selected for total shoulder arthroplasty. Level of Evidence: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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glenoid Component Failure in total shoulder arthroplasty
Journal of Bone and Joint Surgery American Volume, 2008Co-Authors: Frederick A Matsen, Jeremiah Clinton, Joseph R Lynch, Alexander Bertelsen, Michael L RichardsonAbstract:Glenoid Component Failure is the most common complication of total shoulder arthroplasty. Glenoid Components fail as a result of their inability to replicate essential properties of the normal glenoid articular surface to achieve durable fixation to the underlying bone, to withstand repeated eccentric loads and glenohumeral translation, and to resist wear and deformation. The possibility of glenoid Component Failure should be considered whenever a total shoulder arthroplasty has an unsatisfactory result. High-quality radiographs made in the plane of the scapula and in the axillary projection are usually sufficient to evaluate the status of the glenoid Component. Failures of prosthetic glenoid arthroplasty can be understood in terms of Failure of the Component itself, Failure of seating, Failure of fixation, Failure of the glenoid bone, and Failure to effectively manage eccentric loading. An understanding of these modes of Failure leads to strategies to minimize complications related to prosthetic glenoid arthroplasty.
M L Hull - One of the best experts on this subject based on the ideXlab platform.
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what mechanisms are associated with tibial Component Failure after kinematically aligned total knee arthroplasty
International Orthopaedics, 2017Co-Authors: Alexander J Nedopil, Stephen M Howell, M L HullAbstract:Purpose Eight patients treated with kinematically-aligned (KA) total knee arthroplasty (TKA) presented with tibial Component Failure. We determined whether radiographic measurements and clinical characteristics are different between patients with and without tibial Component Failure to identify mechanisms of Failure and strategies to reduce the risk.
Michael L Richardson - One of the best experts on this subject based on the ideXlab platform.
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glenoid Component Failure in total shoulder arthroplasty
Journal of Bone and Joint Surgery American Volume, 2008Co-Authors: Frederick A Matsen, Jeremiah Clinton, Joseph R Lynch, Alexander Bertelsen, Michael L RichardsonAbstract:Glenoid Component Failure is the most common complication of total shoulder arthroplasty. Glenoid Components fail as a result of their inability to replicate essential properties of the normal glenoid articular surface to achieve durable fixation to the underlying bone, to withstand repeated eccentric loads and glenohumeral translation, and to resist wear and deformation. The possibility of glenoid Component Failure should be considered whenever a total shoulder arthroplasty has an unsatisfactory result. High-quality radiographs made in the plane of the scapula and in the axillary projection are usually sufficient to evaluate the status of the glenoid Component. Failures of prosthetic glenoid arthroplasty can be understood in terms of Failure of the Component itself, Failure of seating, Failure of fixation, Failure of the glenoid bone, and Failure to effectively manage eccentric loading. An understanding of these modes of Failure leads to strategies to minimize complications related to prosthetic glenoid arthroplasty.
Kenneth E Davis - One of the best experts on this subject based on the ideXlab platform.
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tibial Component Failure mechanisms in total knee arthroplasty
Clinical Orthopaedics and Related Research, 2004Co-Authors: Michael E Berend, Merrill A Ritter, John B Meding, Philip M Faris, E M Keating, Ryan Redelman, Gregory W Faris, Kenneth E DavisAbstract:The purpose of this study was to examine the Failure mechanisms and factors associated with Failure of a nonmodular metal backed cemented tibial Component. Out of 3152 total knee replacements done for osteoarthritis, 41 tibial Components had been revised (1.3%). Four distinct Failure mechanisms were
Jianhui Wang - One of the best experts on this subject based on the ideXlab platform.
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Quantifying the Influence of Component Failure Probability on Cascading Blackout Risk
IEEE Transactions on Power Systems, 2018Co-Authors: Jianhui WangAbstract:The risk of cascading blackouts greatly relies on Failure probabilities of individual Components in power grids. To quantify how Component Failure probability (CFP) influences blackout risk (BR), this paper proposes a sample-induced semianalytic approach to characterize the relationship between CFP and BR. To this end, we first give a generic Component Failure probability function (CoFPF) to describe CFP with varying parameters or forms. Then, the exact relationship between BR and CoFPFs is built on the abstract Markov-sequence model of cascading outages. Leveraging a set of samples generated by blackout simulations, we further establish a sample-induced semianalytic mapping between the unbiased estimation of BR and CoFPFs. Finally, we derive an efficient algorithm that can directly calculate the unbiased estimation of BR when the CoFPFs change. Since no additional simulations are required, the algorithm is computationally scalable and efficient. Numerical experiments well confirm the theory and the algorithm.
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Quantifying the Influence of Component Failure Probability on Cascading Blackout Risk
arXiv: Optimization and Control, 2017Co-Authors: Jianhui WangAbstract:The risk of cascading blackouts greatly relies on Failure probabilities of individual Components in power grids. To quantify how Component Failure probabilities (CFP) influences blackout risk (BR), this paper proposes a sample-induced semi-analytic approach to characterize the relationship between CFP and BR. To this end, we first give a generic Component Failure probability function (CoFPF) to describe CFP with varying parameters or forms. Then the exact relationship between BR and CoFPFs is built on the abstract Markov-sequence model of cascading outages. Leveraging a set of samples generated by blackout simulations, we further establish a sample-induced semi-analytic mapping between the unbiased estimation of BR and CoFPFs. Finally, we derive an efficient algorithm that can directly calculate the unbiased estimation of BR when the CoFPFs change. Since no additional simulations are required, the algorithm is computationally scalable and efficient. Numerical experiments well confirm the theory and the algorithm.