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- Makela, K. T., et al.
(författare)
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The benefits of collaboration: the Nordic Arthroplasty Register Association
- 2019
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Ingår i: Efort Open Reviews. - : Bioscientifica. - 2058-5241 .- 2396-7544. ; 4:6, s. 391-400
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Tidskriftsartikel (refereegranskat)abstract
- The Nordic Arthroplasty Register Association (NARA) was established in 2007 by arthroplasty register representatives from Sweden, Norway and Denmark with the overall aim to improve the quality of research and thereby enhance the possibility for quality improvement with arthroplasty surgery. Finland joined the NARA collaboration in 2010. NARA minimal hip, knee and shoulder datasets were created with variables that all countries can deliver. They are dynamic datasets, currently with 25 variables for hip arthroplasty, 20 for knee arthroplasty and 20 for shoulder arthroplasty. NARA has published statistical guidelines for the analysis of arthroplasty register data. The association is continuously working on the improvement of statistical methods and the application of new ones. There are 31 published peer-reviewed papers based on the NARA databases and 20 ongoing projects in different phases. Several NARA publications have significantly affected clinical practice. For example, metal-on-metal total hip arthroplasty and resurfacing arthroplasty have been abandoned due to increased revision risk based on i.a. NARA reports. Further, the use of uncemented total hip arthroplasty in elderly patients has decreased significantly, especially in Finland, based on the NARA data. The NARA collaboration has been successful because the countries were able to agree on a common dataset and variable definitions. The collaboration was also successful because the group was able to initiate a number of research projects and provide answers to clinically relevant questions. A number of specific goals, set up in 2007, have been achieved and new one has emerged in the process.
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- Skogar, O, et al.
(författare)
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"Effects of Tactile Touch on pain, sleep and health related quality of life in Parkinsons disease with chronic pain": A randomized, controlled and prospective study
- 2013
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Ingår i: European Journal of Integrative Medicine. - : Elsevier. - 1876-3820 .- 1876-3839. ; 5:2, s. 141-152
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: Parkinsons disease (PD) is often associated with chronic PD related pain. Complementary medicine are widely used but randomized, controlled and prospective studies of the effects are sparse. less thanbrgreater than less thanbrgreater thanAims of the study: To compare the effects of Tactile Touch (TT) with Rest to Music (RTM) in PD patients with chronic pain and to describe effects within groups. less thanbrgreater than less thanbrgreater thanPatients and methods: A 34 week controlled randomized and prospective trial compared the effects of TT with RTM in 45 (29 TT and 16 RTM) patients with PD and chronic pain. The whole body tactile stimulation method was performed for each individual patient by the same therapist for 10 times during the first 8 weeks. The RTM group received the same therapy except for the tactile stimulation. Pharmacotherapy was kept unchanged. Participants were assessed at pre- and post-intervention for pain, sleep patterns and health related quality of life (HRQoL). less thanbrgreater than less thanbrgreater thanResults: Differences between TT and RTM groups were few. Total PDSS significantly improved within the TT but not in the RTM-group. No significant differences between groups were seen in pain parameters, although significant improvements were seen within the TT-group after the intervention period. There were significant improvements within both groups in HRQoL and between groups in the items physical role and social functioning 4 weeks after screening. less thanbrgreater than less thanbrgreater thanConclusions: No significant differences between the TT and RTM groups were seen. Only in single aspects did patients with PD and chronic pain have more benefit more from CAM therapy with TT in combination with RTM.
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- Steen, B., et al.
(författare)
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Body composition in the elderly estimated with an electrical impedance method.
- 1987
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Ingår i: Comprehensive gerontology. Section A, Clinical and laboratory sciences. - 0902-0071. ; 1:3, s. 102-105
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the present study was to test the reliability and validity of a new electrical impedance method for estimating body composition in 35 healthy persons and patients in different sex and age groups, and to obtain basal data on the size of different body composition compartments in elderly individuals in health and disease. The reliability studies showed no significant differences with the new method in intraindividual comparisons before and after changing the positions of the electrodes, drinking of water, and overnight fasting, as well as at a double estimation on 2 consecutive days. The results with this method are compared to results from measurements of total body potassium and total body water, and from a four-compartment model technique using total body potassium and total body water. We conclude that the method has an acceptable reliability and validity and should be of great value not only in field studies but also in clinical practice. Data on body composition with the electrical impedance method are obtained from 147 individuals in different groups, namely healthy females, 80-81-year-old males, female patients from a nursing home, and patients of both sexes from a day care unit.
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- Ackerman, I. N., et al.
(författare)
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Substantial rise in the lifetime risk of primary total knee replacement surgery for osteoarthritis from 2003 to 2013: an international, population-level analysis
- 2017
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Ingår i: Osteoarthritis and Cartilage. - : Elsevier BV. - 1063-4584. ; 25:4, s. 455-461
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To estimate and compare the lifetime risk of total knee replacement surgery (TKR) for osteoarthritis (OA) between countries, and over time. Method: Data on primary TKR procedures performed for OA in 2003 and 2013 were extracted from national arthroplasty registries in Australia, Denmark, Finland, Norway and Sweden. Life tables and population data were also obtained for each country. Lifetime risk of TKR was calculated for 2003 and 2013 using registry, life table and population data. Results: Marked international variation in lifetime risk of TKR was evident, with females consistently demonstrating the greatest risk. In 2013, Finland had the highest lifetime risk for females (22.8%, 95% CI 22.5-23.1%) and Australia had the highest risk for males (15.4%, 95% CI 15.1-15.6%). Norway had the lowest lifetime risk for females (9.7%, 95% CI 9.5-9.9%) and males (5.8%, 95% CI 5.6-5.9%) in 2013. All countries showed a significant rise in lifetime risk of TKR for both sexes over the 10-year study period, with the largest increases observed in Australia (females: from 13.6% to 21.1%; males: from 9.8% to 15.4%). Conclusions: Using population-based data, this study identified significant increases in the lifetime risk of TKR in all five countries from 2003 to 2013. Lifetime risk of TKR was as high as 1 in 5 women in Finland, and 1 in 7 males in Australia. These risk estimates quantify the healthcare resource burden of knee OA at the population level, providing an important resource for public health policy development and healthcare planning. (C) 2016 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.
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- Andersson, Alina, et al.
(författare)
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Analytic Parameterization of Stabilizing Controllers for the Surge Subsystem of the Moore-Greitzer Compressor Model
- 2013
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Ingår i: Proc. 2013 American Control Conference (ACC2013). - 0743-1619. - 9781479901777 ; , s. 5257-5262
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Konferensbidrag (refereegranskat)abstract
- This paper is based on a new procedure for dynamic output feedback design for systems with nonlinearities satisfying quadratic constraints. The new procedure is motivated by the challenges of output feedback control design for the 3-state Moore-Greitzer compressor model. First, we use conditions for stability of a transformed system and the associated matching conditions to find the data of the stabilizing controllers for the surge subsystem. Second, using the set of stabilizing controllers satisfying the given constraints for the closed-loop system with the dynamic output feedback controller we made optimization over the parameter set. We present the data of the stabilizing controllers and the new constraints for the corresponding parameters. The contributions in this paper are simplified conditions for the synthesis and optimization over the control parameter set.
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- Andersson, Alina, et al.
(författare)
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Sufficient Conditions for Dynamic Stabilization of 3-State Moore-Greitzer Compressor Model
- 2015
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Ingår i: 2015 IEEE 54th Annual Conference on Decision and Control (CDC). - 9781479978861 - 9781479978847 ; , s. 4394-4399
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Konferensbidrag (refereegranskat)abstract
- We consider the classical 3-state Moore-Greitzer model, which is commonly used for approximating dynamics of deviations of flow and pressure variables in an axial compressor from their nominal steady-state values. The linearization of the nonlinear system is not controllable and, therefore, even local asymptotic stability cannot be achieved using methods of linear control theory. We propose a family of parametrized partialstate feedback control laws and derive sufficient conditions to guarantee global asymptotic stability of the closed-loop system. The stability analysis uses the integral quadratic constraints technique for the case of non-strict frequency condition and novel arguments for characterization of omega-limit sets.
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- Badawy, Mona, et al.
(författare)
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Hospital volume and the risk of revision in Oxford unicompartmental knee arthroplasty in the Nordic countries -an observational study of 14,496 cases
- 2017
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Ingår i: BMC Musculoskeletal Disorders. - : Springer Science and Business Media LLC. - 1471-2474. ; 18:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: High procedure volume and dedication to unicompartmental knee arthroplasty (UKA) has been suggested to improve revision rates. This study aimed to quantify the annual hospital volume effect on revision risk in Oxfordu? nicompartmental knee arthroplasty in the Nordic countries. Methods: 14,496 cases of cemented medial Oxford III UKA were identified in 126 hospitals in the four countries included in the Nordic Arthroplasty Register Association (NARA) database from 2000 to 2012. Hospitals were divided by quartiles into 4 annual procedure volume groups (≤11, 12-23, 24-43 and ≥44). The outcome was revision risk after 2 and 10 years calculated using Kaplan Meier method. Multivariate Cox regression analysis was used to assess the Hazard Ratio (HR) of any revision due to specific reasons with 95% confidence intervals (CI). Results: The implant survival was 80% at 10 years in the volume group ≤11 procedures per year compared to 83% in other volume groups. The HR adjusted for age category, sex, year of surgery and nation was 0.87 (95% CI: 0.76-0.99, p = 0.036) for the group 12-23 procedures per year, 0.78 (95% CI: 0.68-0.91, p = 0.002) for the group 24-43 procedures per year and 0.82 (95% CI: 0.70-0.94, p = 0.006) for the group ≥44 procedures per year compared to the low volume group. Log-rank test was p = 0.003. The risk of revision for unexplained pain was 40-50% higher in the low compared with other volume groups. Conclusion: Low volume hospitals performing ≤11 Oxford III UKAs per year were associated with an increased risk of revision compared to higher volume hospitals, and unexplained pain as revision cause was more common in low volume hospitals.
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