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  • Oslo Sports Trauma Research Center - 129 - A model-based image-matching technique for 3D reconstruction - application to ACL injury situations
    mechanisms several different approaches are used in the literature Motion analysis of laboratory trials can give important information but for ethical reasons obviously cannot look into injury situations Cadaver studies are undoubtly of great value in finding relationships between external loads and ligament stress but have clear limitations by the fact that the effects of muscles and other tissues cannot be replicated similar to the real in vivo situation By utilizing mathematical simulations more realistic premises can potentially be achieved However the problem with all the mentioned approaches is the fact that it is not possible to verify if the studied situation actually represents the truth For this reason there is a need for objective methods for analysing injury situations However methods for analyzing the mechanisms of injuries in sports from video sequences of injury situations are so far limited to a simple visual inspection which has shown poor accuracy We have previously developed a model based image matching method for extracting kinematics from uncalibrated videos The purpose of this study was therefore to investigate if a new model based image matching technique could be successfully applied to estimate kinematic characteristics of three typical ACL injury situations Methods A four camera basketball video a three camera European team handball video and a single camera downhill skiing video were imported into the program Poser 4 where a skeleton model and a model of the surroundings were matched to the background image frame by frame When the match was considered satisfactory joint angles as well as velocity and acceleration of the center of mass were calculated using Matlab Results In the basketball and handball matchings the skeleton and surrounding models were successfully matched to the background through all frames in all camera angles Detailed time courses for joint kinematics and ground reaction

    Original URL path: http://www.klokavskade.no/en/Project/129---A-model-based-image-matching-technique-for-3D-reconstruction---application-to-ACL-injury-situations-/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 124 - Ultrasound-guided sclerosis of neovessels in painful chronic patellar tendinopathy – a randomized controlled trial
    A pilot study from Sweden of the same treatment on patients with patellar tendinopathy has also shown promising results Based on these results and our hypothesis that sclerosing the area of neovascularisation would decrease the level of patellar tendon pain during tendon loading activity for patients with patellar tendinopathy the research group investigated this novel treatment on a group of elite athletes with patellar tendinopathy The principal investogator for this study was Aasne Hoksrud from the Oslo Sports Trauma Research Center with Lars Öhberg University of Umeå Håkan Alfredsson University of Umeå and Roald Bahr Oslo Sports Trauma Research Center as co investigators Results We recruited 33 patients 42 tendons mainly from the Norwegian elite division in basketball team handball and volleyball The study was divided into two treatment periods During treatment period I patients in the treatment group received sclerosing injections and patients in the control group received placebo injections At the 4 month follow up after the end of the treatment period I the patients in both groups were offered sclerosing injections treatment period II Pain and function was recorded using VISA score before the start of treatment and 4 months end of treatment period I 8 months end of treatment period II and 12 months after the first injection The treatment group reported a significant improvement in pain and function score VISA score from 51 14 to 62 23 after the end of the intervention period compared with the control group 53 12 til 55 16 p 0 052 MANOVA After treatment period II when the control group received sclerosing injections also the control group had a significant improvement in pain and function score compared with before treatment VISA score fra 58 18 til 79 18 p 0 001 paired t test 12 months after the first

    Original URL path: http://www.klokavskade.no/en/Project/Ultrasound-guided-sclerosis-of-neovessels-in-painful-chronic-patellar-tendinopathy--a-randomized-controlled-trial/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 021 - The effect of eccentric training on patellar tendinopathy among volleyball players
    Project manager Roald Bahr Co worker s Jill Cook Aasne Hoksrud Håvard Visnes Project status Published Start date 2002 End date 2003 Print Publications 2007 Visnes 2007 BJSM Evolution of eccentric training as treatment for patellar tendinopathy pdf 2005 Visnes

    Original URL path: http://www.klokavskade.no/en/Project/021---The-effect-of-eccentric-training-on-patellar-tendinopathy-among-volleyball-players-/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 113 - Self-estimation of ability among skiers and snowboarders in alpine skiing resorts
    factors for skiing injuries it is relevant to know the ability of the skier or snowboarder This is usually done through self reporting based on a single question asking the skier to classify his ability in four categories However although a number of different questions have been used their ability to discriminate between better and less able skiers has not been studied The aim of this study was to therefore to validate five different questions designed to self report skiing ability Throughout the winter season of 2002 a random group of skiers in Norwegian alpine skiing resports were asked to classify their ability into four categories by completing a questionnaire with five different questions based on Ability expert advanced intermediate beginner piste difficulty off piste black piste red piste blue piste childrens piste turning technique alpine skis carving short turns parallell turns stem turns plough snowboard carving short turns continuous turns interrupted turns sliding on the edge skiing experience 5 seasons 3 5 seasons 1 2 seasons 1 season of skiing and falling frequency never now and then every day every run After filling in the quesionnaire the participants were asked to make a test run under observation to define

    Original URL path: http://www.klokavskade.no/en/Project/113---Self-estimation-of-ability-among-skiers-and-snowboarders-in-alpine-skiing-resorts-/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 077 - An immune-histochemical study of subclasses of inflammatory cells and active collagen-producing fibroblasts in the patellar ligament in patients with jumper's knee
    of subclasses of inflammatory cells and active collagen producing fibroblasts in the patellar ligament in patients with jumper s knee Project manager Øystein Lian Supervisor s Roald Bahr Co worker s Paul Ackerman Lars Engebretsen Project status Published Start date

    Original URL path: http://www.klokavskade.no/en/Project/077---An-immune-histochemical-study-of-subclasses-of-inflammatory-cells-and-active-collagen-producing-fibroblasts-in-the-patellar-ligament-in-patients-with-jumpers-knee-/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 078 - Innervation of the patellar ligament in patients with jumper`s knee
    to compare nerve regeneration and nerve numbers between the groups This may give information about the pain mechanisms in tendon injuries The total number of nerve fibers is identified with antisera against protein gene product 9 5 PGP 9 5 Wilkinson 1989 Lundberg 1988 Gulbenkian 1987 Nerve regeneration is evaluated by the existence of growth associated protein 43 B 50 GAP 43 B 50 which is associated with nerve development

    Original URL path: http://www.klokavskade.no/en/Project/078---Innervation-of-the-patellar-ligament-in-patients-with-jumpers-knee-/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 084 - The prevalence of previous serious knee injuries among World Cup elite freestyle skiers
    leaders for each team The biographicals of the skiers their nationality disipline moguls or aerials and the number of years world cup skiing was registered The skiers were further asked whether they had ever sustained a former major knee injury defined as a knee injury leaving them out of regular training activity for at least 3 weeks Given such an injury we asked under what circumstances the injury happened whether the skier had been through an MRI scan or artroscopy the findings and given the ACL was torn whether it was reconstructed The data are analyzed with SPSS software using Crosstabulation Chi square test and Comparing means independent t test Level of significance has been defined as 0 05 Results Completed questionaires of ninety five skiers 63 response 55 men and 40 women age 1836 mean 24 7 were collected Twenty one men 38 and 24 women 60 p 0 035 reported a total of 74 former major knee injuries ranging from 1 to 5 during their skiing careers Thirteen men 23 6 and 12 women 30 0 p 0 49 reported a total of 34 former ACL injuries Three men and 3 women had sustained bilateral ACL ruptures whereas 3 skiers had had reruptures in one knee Four of the 34 torn ACLs were not reconstructed Nineteen of the 34 ACL injuries were combined with cartilage meniscal or MCL injuries Five skiers 5 3 reported to have had a cartilage injury without an ACL injury 7 skiers 7 4 reported meniscal tears without ACL or cartilage injuries and 12 skiers 12 6 reported isolated MCL injuries There were not any significant difference between the genders in the prevalence of any of the specific types of injury Furthermore the prevalence of knee injuries as a total as well as of

    Original URL path: http://www.klokavskade.no/en/Project/084---The-prevalence-of-previous-serious-knee-injuries-among-World-Cup-elite-freestyle-skiers-/ (2015-09-15)
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  • Oslo Sports Trauma Research Center - 108 - The FIVB Beach Volleyball Injury Study: injuries among professional beach volleyball players
    on a standard form including exposure and injury data An injury is defined as any brain concussion causing cessation of the athletes participation for physical observation before return to play or any dental injury requiring professional attention or any injury causing cessation of the athletes customary participation in competition or training time loss injuries or requiring substansive professional attention by a physician physical therapist or chiropractor medical attention injuries Exposure will be recorded retrospectively for each week including the number of matches played including matches to qualify for the main draw in World Tour events the number of hours of beach volleyball training and other forms of training strength and conditioning In addition to the retrospective survey we will carry out a prospective registration of all injuries recorded during the FIVB World Championships in Klagenfurt as well as the FIVB World Tour in Stavanger and Espinho During each of these tournaments all injuries for which the player seeks medical attention will be recorded by the tournament medical staff physicians physical therapists or chiropractors using the same injury forms as in the retrospective survey Results A total of 54 acute injuries were recorded during 4 241 player hours of match play and 12 788 player hours of training covered by the retrospective study Of these 23 43 caused the player to miss one or more days of practice or competition Thus the incidence of acute time loss injuries was 3 1 per 1000 competition hours 2 9 for men and 3 3 for women and 0 7 per 1000 training hours 0 8 for men and 0 7 for women Knee injuries 30 ankle injuries 17 and finger injuries 17 accounted for more than half of all acute time loss injuries In addition the players reported 79 overuse injuries for which

    Original URL path: http://www.klokavskade.no/en/Project/108---The-FIVB-Beach-Volleyball-Injury-Study-injuries-among-professional-beach-volleyball-players-/ (2015-09-15)
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