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Comparison of results of ACL reconstruction using LARS method and autogenous ST/GR graft

Płocki Jędrzej, Pelikan Piotr, Bejer Agnieszka, Granek Arkadiusz, Krawczyk-Suszek Marlena, Kotela Ireneusz

Acta of Bioengineering and Biomechanics

2019

Vol. 21, no. 1

113--119

The objective of the study was assessment of the function of the knee joint after ACL reconstruction using the LARS method and autogenous graft. The study was of a retrospective character and included 96 patients who had undergone reconstruction of the torn ACL. The study was conducted within 36–48 months after surgery. Methods: In order to compare the results of the ACL reconstruction performed with 2 types of grafts, the following instruments were used: Lysholm Knee Scoring Scale, SF 36v2 questionnaire for assessment of health-related quality of life, and Biodex System 4 for isokinetic muscle testing. Results: No differences in the evaluation of the quality of life measured using SF 36v2 questionnaire were observed between the LARS and ST GR groups. Using the Lysholm Scale, the distribution of knee function scores was compared according to the type of surgery. There are no grounds to confirm the differences in the distribution of knee function scores considering the type of graft ( p = 0.756). Isokinetic test showed a significant weakening of muscle strength in the operated limb, compared to the strength of the healthy limb. Conclusions: The type of graft used for ACL reconstruction does not exert an effect on the quality of life of patients or the level of their knee joint function. Extensor and flexor muscles strength of the knee joint was lower in the operated limb, irrespective of the type of graft used. Weak relationships were observed between the level of knee joint function and extensor muscle strength of this joint.

Assessment of postural stability in patients after reconstruction of the anterior cruciate ligament with LARS and autogenous graft

Plocki J., Kotela I., Bejer A., Pelikan P., Granek A., Krawczyk-Suszek M.

Acta of Bioengineering and Biomechanics

2018

Vol. 20, no. 4

9--14

The aim of the study was to assess static balance after reconstruction of the anterior cruciate ligament (ACL), using gracialis tendons graft (GR) or semi-tendinosus (ST), compared to patients treated with the Ligament Advanced Reinforcement System (LARS). The study was performed within 36 to 48 months after the surgery. Methods: The study included 96 patients. The LARS group consisted of 44 patients, control group operated with ST/GR tendons included 52 patients. The stabilometric platform Alpha was used to assess the static balance. Two 30-second trials in the double-leg stance position with eyes opened and closed were performed. The distribution of loads in a free standing was also assessed. Results: In the test with open eyes the subjects from the LARS group had a significantly longer center of pressure (COP) path, a higher mean velocity, a greater mean COP sway in foot in the lateral direction and a larger path area occupied by the COP graph. During the tests with eyes closed, a significant difference occurred in the mean displacement of COP in lateral direction – greater in the LARS group. In addition, all parameters deteriorated during the tests with eyes closed in both groups. Conclusions: In static balance assessed with eyes closed, more proprioceptive deficits may appear in the LARS group.

System wspomagający “LARS” do obsługi urządzeń wydobywczych z dna morskiego

Szczotka M.

Autobusy : technika, eksploatacja, systemy transportowe

2016

R. 17, nr 12

733--738

Wiele istotnych, rozpoznanych zasobów metali rzadkich znajduje się w miejscach styku płyt kontynentalnych. Dochodzi tam do podwodnych erupcji, w wyniku których materiały transportowane są z wnętrza ziemi i osadzają się tworząc charakterystyczne formy. Metale te, znajdujące się na dnie mórz i oceanów, mogą być dostępne przy użyciu metod i technologii opracowanych dla przemysłu wydobycia ropy naftowej i gazu. Ich potencjalne wydobycie przeważnie oznacza konieczność prac na głębokości kilku kilometrów, stwarzając jednocześnie szereg wyzwań dla znanych metod i istniejących konstrukcji. W artykule przedstawiono system wspomagający operacje opuszczania i podnoszenia przy użyciu specjalistycznego systemu LARS (Launch and Recovery System), zaprojektowanego i wykonanego dla potrzeb transportu maszyn wytwarzających urobek z osadów wulkanicznych na dnie morza. Koszty oraz rozmiary tych urządzeń są znaczne, co wymusiło przyjęcie możliwie prostej konstrukcji sprzętu dźwigowego. Od bezawaryjnej pracy całego systemu zależy m.in. rentowność przedsięwzięcia, stąd próba opracowania układu wspomagającego operatora, zastępującego bardziej zaawansowane rozwiązania. Celem tego systemu jest wskazanie możliwości poderwania ładunku z dna lub posadowienia na nim urządzenia wydobywczego w taki sposób, aby nie dopuścić do niekontrolowanego kontaktu z dnem, do którego może doprowadzić ruch jednostki pływającej. Przedstawiono opis założeń systemu oraz przykładowe wyniki obliczeń.

Launch and recovery system (LARS) for a deep see mining application is considered in the paper. As the exploration of rare metals is stepping into a new phase consisting deep sea locations, the technology ap plied on such installations will be challenged. All systems must be reliable due to operational reasons, but also the safety of crew must be taken into account. As the presented LARS is not equipped with any of advanced load positioning systems (like AHC), a custom made software and model is used in order to aid both with lifting and lowering operations. The primary goal is to avoid uncontrolled contacts between subsea mining tools and the seafloor, which can be an issue during touch-down and lift-off operations. Such accidents may occur as the result of ship movements due to waves and winch speed limitation. Description of the system as well as some example results are presented.