| 1. |
- Carlsson, Lars V, et al.
(author)
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Stepwise introduction of a bone-conserving osseointegrated hip arthroplasty using RSA and a randomized study: I. Preliminary investigations--52 patients followed for 3 years.
- 2006
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In: Acta orthopaedica. - : Medical Journals Sweden AB. - 1745-3674 .- 1745-3682. ; 77:4, s. 549-58
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Journal article (peer-reviewed)abstract
- BACKGROUND: We developed a total hip system using osseointegration guidelines, a metaphyseal-loading proximal femoral replacement in the retained neck and a dual-geometry titanium shell in the acetabulum. PATIENTS AND METHODS: A randomized controlled clinical trial was undertaken in 52 patients (53 hips), using the cemented Spectron stem and cementless Harris-Galante II cup as control implants (24 patients in experimental group, 29 control patients). Clinical measures of Harris Hip Score (HHS), pain score and radiostereometric analysis (RSA) at regular intervals for up to three years were used to monitor progress. RESULTS: No statistically significant differences were found in HHS and pain score; the stability of the cementless experimental implant was also comparable to that of the cemented controls by RSA. 3 revisions were required for migration in the experimental group and 1 was required for component dislocation in the control group. INTERPRETATION: Our findings indicate the practicality of osseointegration of titanium implants, but suggest that current performance is inadequate for clinical introduction. However, the stable fixation achieved in the retained neck in the majority of patients is indicative of osseointegration. This finding will encourage technical and design improvements for enhancement of clinical osseointegration and should also encourage further study. Periprosthetic osteolysis might be avoided by the establishment and maintenance of direct implant-bone connection: "osseointegration".
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| 2. |
- Wijk, Helle, 1958, et al.
(author)
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Verksamhetsförlagd utbildning på avancerad nivå : ny utmaning för specialistutbildningar för sjuksköterskor
- 2009
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In: Vård i Norden. - København : Sjuksköterskornas samarbete i Norden. - 0107-4083 .- 1890-4238. ; 29:94, s. 41-43
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Journal article (other academic/artistic)abstract
- The aim of this article is to discuss challenges in the development of Specialist Nursing Educations as a result of the 2007 Swedish Higher EducationReform: the implementation of the so-called Bologna process. Certain challenges follow this reform, particularly since the specialist nursingprogrammes will be part of the second cycle of the higher education system, and it will be possible to combine the professional degree witha masters degree (one year). Possible strategies in four areas related to the Specialist Nursing Education are discussed: integration of researchbasedknowledge, experienced-based knowledge, improvement knowledge, and strategies for collaboration between university institutions andclinics. Specific didactical issues are raised.
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| 3. |
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| 4. |
- Bergek, Anna, 1973-, et al.
(author)
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'Legitimation' and 'development of positive externalities' : Two key processes in the formation phase of technological innovation systems
- 2008
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In: Technology Analysis & Strategic Management. - : Informa UK Limited. - 0953-7325 .- 1465-3990. ; 20:5, s. 575-592
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Journal article (peer-reviewed)abstract
- Responding to the climate change challenge requires a massive development and diffusion of carbon neutral technologies and, thus, emergence and growth of new socio-technical systems. This paper contributes to an improved understanding of the formative phase of new technological innovation systems (TIS) by outlining a framework for analysing TIS dynamics in terms of structural growth and key innovation-related processes ("functions") and by discussing two of these functions at some depth: "legitimation" and "development of positive externalities". Empirical examples are provided from case studies on renewable energy technologies. We highlight the problematic role of technology assessment studies in shaping legitimacy and the importance of early market formation for the emergence of "packs of entrepreneurs" that may contribute to legitimation, and discuss how exploitation of overlaps between different TISs may create positive externalities, opening up for a powerful "bottom-up" process of system growth. Associated policy and management challenges are identified.
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| 5. |
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| 6. |
- Carlsson, Lars, 1952, et al.
(author)
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Stepwise introduction of a bone-conserving osseointegrated hip arthroplasty using RSA and a randomized study: II. Clinical proof of concept--40 patients followed for 2 years
- 2006
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In: Acta Orthopaedica. - : Medical Journals Sweden AB. - 1745-3674 .- 1745-3682. ; 77:4, s. 559-566
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Journal article (peer-reviewed)abstract
- BACKGROUND: We have developed a bone-conserving commercially pure titanium hip replacement system using osseointegration principles: a metaphyseal loading proximal femoral component affixing into the retained neck and metaphysis only, leaving the femoral canal untouched. The acetabular cup closely fits a dual-geometry cavity, avoiding stress protection at the dome. PATIENTS AND METHODS: After extensive laboratory and clinical pilot trial investigations, the surface-engineered implants were submitted to a prospective randomized controlled clinical trial involving 40 patients (40 hips), in which they were compared to the cemented Spectron femoral component and cementless Trilogy cup as control implant. The following clinical measures were used to monitor progress at regular intervals for the first 2 postoperative years: radiostereometric analysis (RSA), Harris Hip Score, pain score, WOMAC, and SF-36. RESULTS: After 2 years of follow-up, no statistically significant differences were seen between the groups concerning rotation or translation along the cardinal axes. The patients receiving the Gothenburg osseointegrated titanium (GOT) system had significantly higher Harris Hip Score at 6 months, suggesting more rapid recovery. WOMAC, SF-36 and pain analysis were similar for the first 2 postoperative years. INTERPRETATION: Our RSA data suggest that osseointegration was achieved for all patients receiving the GOT hip system. This bone-conserving prosthesis may provide a good alternative, especially for young and active patients.
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| 7. |
- Hellström, Jonas E., et al.
(author)
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Finite beams in reflective volume Bragg gratings : theory and experiments
- 2008
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In: IEEE Journal of Quantum Electronics. - 0018-9197 .- 1558-1713. ; 44:1, s. 81-89
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Journal article (peer-reviewed)abstract
- We present a theoretical model to describe finite beams incident on reflective volume Bragg gratings. We also give experimental results that verify our model. From these results, we identify certain properties of reflective volume Bragg gratings, such as beam waist, incidence angle and beam profile, that have direct impact on the design of laser cavities that include such gratings. We also show how these gratings can act as spatial mode filters.
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| 8. |
- Hellström, Jonas E., et al.
(author)
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Quasi-two-level Yb:KYW laser with a volume Bragg grating
- 2007
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In: Optics Express. - 1094-4087. ; 15:21, s. 13930-13935
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Journal article (peer-reviewed)abstract
- Using a volume Bragg grating as input coupler, we demonstrate an Yb:KYW laser with a very small quantum defect (1.6%) and an output power of 3.6 W. The laser was longitudinally diode-pumped at 982 nm and the laser wavelength was determined by the grating to 998 nm, with a laser bandwidth of 10 GHz (33 pm). Due to the low quantum defect, the laser should be readily scalable to 20 W or more without critical thermal effects.
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| 9. |
- Hellström, Jonas, et al.
(author)
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Tunable Yb : KYW laser with volume Bragg grating
- 2007
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In: Advanced Solid-State Photonics (ASSP) 2007. - : Optical Society of America. - 9781557528292 - 1557528292
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Conference paper (peer-reviewed)abstract
- We demonstrate a tunable Yb:KYW laser, locked by a volume Bragg grating in a retroreflector geometry. The power was ~1 W within the tuning range from 1032 nm to 1048 nm.
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| 10. |
- Häggström, Ida, et al.
(author)
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Monolithic Bragg-locked Nd:GdVO4 laser
- 2007
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In: Optics Express. - 1094-4087. ; 15:18, s. 11589-11594
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Journal article (peer-reviewed)abstract
- We present a monolithic single-longitudinal-mode laser based on Nd:GdVO4 and a volume Bragg grating. The laser at 1066 nm had a bandwidth below 40 MHz at a power of 30 mW. With temperature, the laser frequency could be continuously tuned without mode hops over a range of 80 GHz. The demonstrated laser design is very compact and simple and can be used to lock the laser wavelength anywhere in the gain spectrum.
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