Temat: meniscus - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Is quantitative diffusion weighted MR imaging and ADC mapping with b-values of 50-400-800 sec/mm2 a reliable method for the evaluation of meniscal tears in the knee?
Autorzy:: Aydın, Hasan
Hekimoglu, Baki
Kızılgöz, Volkan
Opis:: Background: Our aim was to evaluate the efficacy of Diffusion-Weighted Imaging (DWI) and Apparent Diffusion Coefficient (ADC) mapping with different b-factors in visualisation of meniscal tears. Material/Methods: Seventy-four patients; 30 males and 44 females, 37 left and 37 right knees with meniscal tears were involved in this study. Eleven of them were lateral meniscal tears and 63 - medial meniscal tears. DWI was obtained by 3D-SE Echo-planar Imaging (EPI) in coronal and sagittal planes. ADC mapping was carried out in coronal planes with b-factors of 50, 400, and 800 sec/mm2. The statistical analysis of DWI and ADC mapping results was performed with the use of the Fisher's test and the chi-square test. Results: 1. For both menisci and 74 tears: DWI revealed 86% sensitivity and 100% specificity (p=0.149) with a positive predictive value (PPV) of 1 and a negative predictive value (NPV) of 0.09. ADC mapping with b-value of 400 sec/mm2 had 78% sensitivity, and 100% specificity, with PPV of 1 and NPV of 0.06 (p=0.230). 2. For the lateral meniscal tears: DWI and ADC mapping with b-value of 800, for the medial meniscal tears: DWI and ADC mapping with b-factor of 400 s/mm2 revealed higher sensitivity and specificity than other methods. Conclusions: Quantitative DWI and ADC mapping, especially with b-factor of 400 sec/mm2, may be an alternative to routine MR imaging sequences for the visualisation of meniscal tears in the knee.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Scaffolds in knee joint meniscus engineering
Skafoldy w inżynierii łąkotki stawu kolanowego
Autorzy:: Pukaluk, A.
Ryniewicz, A. M.
Tematy:: anatomical meniscus
tissue engineering
scaffold
meniscus implant
anatomia łąkotki
inżynieria tkankowa
skafold
implant łąkotki; Pokaż więcej
Wydawca:: Wyższa Szkoła Techniczno-Ekonomiczna w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/135804.pdf Link otwiera się w nowym oknie
Opis:: Introduction and aims: In the knee joint are located two menisci, which play an essential role in the preservation of chondral surfaces and assurance of knee stability. Due to their activity during knee movement, they are strongly exposed to injury not only during professional sport training, but during normal, active life as well. In case of complex degeneration of the meniscal tissue, the regeneration help is needed. This help is provided by polyurethane or collagen meniscus scaffolds. Material and methods: The model of the right knee joint has been designed to in order to investigate the distribution of reduced stresses. The NASTRAN application has been used for calculations. Results: The distribution of the reduced stresses in the right knee joint model are presented in the article. Conclusion: Scaffold is a matrix that is designed to replace the damaged meniscal tissue. It is useful in case of complex tears, for which assessment of biomechanical function restoration after sewing is negative.
Wstęp i cele: W stawie kolanowym znajdują się dwie łąkotki, które odgrywają istotną rolę w zachowaniu powierzchni chrzęstnych oraz zapewniają stabilność kolana. Ze względu na ich aktywność podczas ruchu stawu kolanowego, są silnie narażone na uszkodzenia, nie tylko w profesjonalnym treningu sportowym, ale również w normalnym, aktywnym życiu. W przypadku złożonych uszkodzeń tkanki łąkotki pożądana jest jej regeneracja, która jest wspomagana przez poliuretanowe lub kolagenowe skafoldy łąkotki. Materiał i metody: W celu wykonania badań skonstruowano model prawego stawu kolanowego. Aby otrzymać wartości naprężeń zredukowanych w teście zastosowano program numeryczny NASTRAN. Wyniki: W pracy przedstawiono rozkłady naprężeń zredukowanych w modelu prawego stawu kolanowego. Wniosek: Skafold jest matrycą, która ma zastąpić uszkodzoną tkankę współpracujących powierzchni kolana. Ta metoda regeneracji jest szczególnie użyteczna w przypadkach ujemnej oceny możliwości przywrócenia biomechanicznych funkcji łąkotki po zszyciu.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparison of durability of resorbable polymer pins in in vitro and in vivo conditions: preliminary study
Autorzy:: Stodolak-Zych, E.
Pałka, K.
Szponder, T.
Nowicka, K.
Błażewicz, S.
Tematy:: meniscus
bone pins
polylactide
regeneration; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/284181.pdf Link otwiera się w nowym oknie
Opis:: The work focuses on polymeric cartilage/bone pins (pegs) that were manufactured and tested to assess their application in meniscus injuries. The bone pins measuring 1,2 and 4 mm in diameter were produced from certified resorbable PLDLA by means of hot pressing (at 126oC). In order to establish the material characteristics, tests of mechanical properties, structural testing and stability tests were performed in vitro (an immersion medium: water/PBS buffer). It was established that after three months of incubation the initial implant’s bending strength (120 MPa) decreased by 35%, whereas its tensile strength (52 Pa) weakened by 60%. The degree of degradation did not affect the pH of the immersion fluid. The observed physical changes of the implant, such as: the mass decrease, the change of shape, the increase of crystallinity (DSC/TG), the number of polymer terminal groups (-OH, -COOH), proved the advanced degradation process of PLDLA pins. Implants of particular behaviour were inoculated into the tibia of a New Zealand rabbit. In vivo tests were conducted to confirm the changes observed in vitro. Monitoring of the degradation process was performed after three months following the implantation by means of control X-ray and computed microtomography (μCT).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The utility of virtual monochromatic dual-energy computed tomography (DECT) in meniscal imaging : a technical evaluation
Autorzy:: Adams, Scott
Reis, Jodie
Shepel, Michael
van Heerden, Jacques
Mondal, Prosanta
Obaid, Haron
Opis:: Purpose: To determine the feasibility of meniscal imaging using virtual monochromatic images obtained through dualenergy computed tomography (DECT) technique, and to determine which keV levels optimise contrast resolution. Material and methods: All DECT exams were performed on a Discovery CT750 HD system from GE Healthcare. Virtual monochromatic images were reconstructed at 40 keV, 73 keV, 106 keV, and 139 keV. Contrast resolution of the medial and lateral menisci using a 5-point Likert scale at each keV level was determined through a consensus agreement by 2 fellowship-trained musculoskeletal radiologists. Friedman's and Wilcoxon signed rank tests were used to compare visualisation scores across different keV levels. Results: Seventeen knee exams from 10 patients met criteria for inclusion in the study. All patients included in the study cohort were male. The median age of patients was 46 years (interquartile range, 35-53 years). Virtual monochromatic images at 40 keV demonstrated highest contrast resolution of the menisci, with a statistically significant difference between contrast resolution scores at 40 keV and 76 keV, Friedman test: p < 0.0001.Conclusions: Meniscal imaging is feasible using DECT virtual monochromatic images at low keV levels. Improved contrast resolution at these specified KeV values could pave the way for further research in this field to determine its role in the future as an alternative option for assessment of the menisci in patients with contraindications to MRI or in the setting of a periarticular ferromagnetic foreign body obscuring the field of view.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Ultrasound assessment of the meniscus complex formation in health children and with the 1st stage of longitudinal platypodia ones
Ocena ultrasonografczna tworzenia kompleksu łąkotkowego u dzieci zdrowych i przy płaskostopiu 1.stopnia
Autorzy:: Ivantsov, Alexei
Vorobyeva, Daria
Tematy:: łekotka
dzieci
usg
meniscus
children
ultrasound investigation; Pokaż więcej
Wydawca:: Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Powiązania:: https://bibliotekanauki.pl/articles/906449.pdf Link otwiera się w nowym oknie
Opis:: Wstęp: Przy płaskostopiu jest prawie utracona funkcja stóp, zmiękczająca obciążenia udarowe, w wyniku czego rolę amorty- zatora zmuszone są przejąć łąkotki. Materiał i metoda: W trakcie badania USG grubość łąkotek mierzono na poziomie przestrzeni stawowej. Wyniki: U chorych w wieku 5-7 lat, cierpiących na płaskostopie podłużne 1. stopnia w przystosowaniu łąkotkowego kompleksu dominował typ szpotawość (varus) (43.4%), 8-12 lat - typ symetryczny (51.9%) oraz 13-17 lat (56%) - typ koślawy (valgus). U zdrowych dzieci we wszystkich okresach wieku obserwowano typ koślawy. Wnioski: Częstość występowania szpotawości kompleksu meniskowego u dzieci w wieku 5-7 lat, a następnie zmiana do koślawości przy płaskostopiu podłużnym 1. stopnia, w naszej opinii, wskazuje na zwolnienie procesu transformacji szpota- wości kończyn dolnych w pozycję koślawą, która jest bardziej wygodna ze względów funkcjonalnych u dzieci w wieku 13-17.
Objectives: Foot arch reduces the exposure of weight and buf load due to its bufer function. in longitudinal platypodia foot looses this function and articular menisci have to take the role of the bufers (shock absorbers). Materials and Methods: Ultrasound assessment of meniscus thickness was performed on the joint space level. Results: Varus type (43.4%) of the meniscus complex adaptation was dominant in 5-7 years old patients with the 1st stage longitudinal platypodia; symmetric type (51.9%) – in 8-12 years old patients; valgus type (56%) – in 13-17 years old ones. Healthy children showed the valgus type in all age periods. Conclusions: In our opinion the dominance of the varus type of the meniscus complex in 5-7 aged children and its further conversion into the valgus type in case of the 1st stage longitudinal platypodia refects the reduction of the lower extremities transformation processes from the varus into the most functional convenient valgus position at the age of 13-17.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Physical therapy following saucerisation of discoid meniscus - a case study
Autorzy:: Feluś, Jarosław
Żmijewska, Kinga
Fąfara, Alicja
Gądek, Artur
Opis:: Introduction: Discoid meniscus is a structure with altered shape, which causes it to frequently undergo injuries and lesions. Pain, limping, limited range of motion of the knee joint and swelling are characteristic signs of this pathology. Therapeutic possibilities include meniscectomy and saucerisation. Research objective: The study aim was assessment of the therapeutic effectiveness in a patient after saucerisation of discoid meniscus. Material and methods: A 12-year-old female patient after saucerisation of lower left limb lateral discoid meniscus (type I) was subjected to 32-week physical therapy treatment. Testing included determining the range of knee joint flexion and extension movements, as well as measuring the circumference of the lower extremities 15 cm above the patella. The Kujala Score (Anterior Knee Pain Scale) and Ikeuchi grading system were employed during the 1st, 3rd, 8th, 21st and 32nd weeks postoperatively. Results: In the final stage of physical therapy, complete range of knee joint motion was achieved, the Kujala Scale score totalled 98 points and the thigh circumference of the operated limb increased by 4 cm. The circumferences of the lower extremities differed by 2 cm in the final phase of physical therapy. Conclusions: The employed postoperative protocol effectively influenced the functional state of the patient.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Correlation between rotational moments of the knee and other joints during gait, including the free moment of patients with a medial meniscus tear
Autorzy:: Ibara, Takuya
Hada, Kiyotaka
Karashima, Ryosuke
Kawashima, Mahito
Anan, Masaya
Tematy:: gait
knee moment
free moment
medial meniscus tear; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/55622178.pdf Link otwiera się w nowym oknie
Opis:: Rotation of the knee puts stress on the medial meniscus and can be a factor in the progression of knee osteoarthritis. This study aimed to investigate the rotational moment (internal rotation and external rotation) of the knee during gait and relationship between the rotational moments of the knee and other joints, including the free moment during gait. Methods: We included 18 patients with medial meniscus tears (MM group) and 10 asymptomatic participants in this study. We performed 3D gait analysis. The internal ankle, knee, and hip rotational moments as well as free moment were compared between the groups. Additionally, we investigated correlations between rotational moments of the knee and other joints during gait. Results: The maximal knee external rotation moment in the MM group was smaller than that in the asymptomatic group ( p = 0.04, g = 0.76); however, there were no significant differences in the maximal internal rotation moment between the groups ( p = 0.97, g = 0.02). The internal rotation (external knee external rotation) moment positively correlated with the hip internal rotation moment ( p < 0.01, r = 0.69) in the MM group. Conclusions: The internal rotation (passive knee external rotation moment) did not decrease sufficiently, and correlation was observed between moments of the knee and hip in the MM group, especially during the late stance phase of gait. Reducing these abnormal moments during gait through rehabilitation may be important in patients with medial meniscus tears to prevent rapid progression of knee osteoarthritis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Assessment of 3-T MRI using susceptibility-weighted imaging to detect and evaluate intra- or periarticular blood metabolites and meniscal tears of the knee
Autorzy:: Drakopoulos, Dionysios
Tomalski, Maciej
Knap, Daniel
Christe, Andreas
Tombarkiewicz, Marek
Mitrakovic, Milena
Platzek, Ivan
Sieron, Dominik A.
Opis:: Purpose: The purpose of this study was to assess the suitability of susceptibility-weighted imaging (SWI) sequences using the 3T MRI-unit for assessment of potential intraarticular pathologies in patients with acute and chronic torsion trauma of the knee joint. Material and methods: Sixty-three patients with subacute and chronic rotary knee joint trauma of either the left or right knee were studied using an Achieva MRI 3T device (Philips, Amsterdam, Netherlands). Ground truth was set by two expert radiologists with seven and 10 years of experience in musculoskeletal imaging. Readings were performed separately for meniscus and joint space including synovia, ligaments, and periarticular soft tissue. Haemorrhage was defined as any lesion that was either T1 or SWI positive, without proton density (PD)-hypointensity (calcification). A lesion was defined as any pathology/variant with any signal positivity of either T1, PD, or SWI. Results: A total of 63 patients were included (F : M = 22 : 41). The median age of the cohort was 29 years (range 13 to 71 years). Thirty-nine patients showed a meniscal tear, and only three of them (7.7%) demonstrated a meniscal haemorrhage. A total of 18 patients suffered from a periarticular injury, and 16 patients (88.9%) demonstrated a concomitant periarticular haemorrhage. Conclusions: These data suggest that SWI can be used for the diagnosis of intra- or periarticular blood metabolites because their potential have an impact on mechanical conflict with the surface of the knee joints, in particular the cartilage and their effect on malacic lesions, but it performs poorly in the detection of meniscal pathologies.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: The Automatization of Alignment System for Calibration of Hydrometers
Autorzy:: Sariyerli, G.
Akcadag, U.
Sakarya, O.
Tematy:: the Cuckow method
hydrostatic weighing
hydrometer
density
calibration
meniscus; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032322.pdf Link otwiera się w nowym oknie
Opis:: In this study, the determination of weighing liquid by using automatic alignment system and the reference density standard to realize the calibration of scale division by hydrostatic weighing method introduced by Cuckow in computer controll is planned. This system serves all projects of Volume, Density and Viscosity Laboratory for the calibration process of hydrometers and makes it fully automatic, fast, more precise and efficient in comparison with manual calibration system. A new method refers automatically specific scale-marks for the calibration of hydrometers. A hydrometer calibration system adopting the new method consists of a vision system, positioning frame by servo motor and software to control the system. The vision system is composed of a camera to acquire images of meniscus level conflicted with scale level of hydrometer. The position of temperature controlled bath is provided by the positioning frame controlled with PLC. The stepping motor moves the camera, which is attached to the vessel containing a reference liquid, along the hydrometer. The aim of this study is to represent and validate the automated hydrometer calibration system of TUBITAK UME realizing the hydrometer comparison (1000-1020 kg/m³) between automated and manual hydrometer calibration system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Autorzy:: Chien, Alexander
Kinne, Erica
Omar, Imran
Weaver, Jennifer S
Opis:: Knee pain is frequently seen in patients of all ages, with a wide range of possible aetiologies. Magnetic resonance imaging (MRI) of the knee is a common diagnostic examination performed for detecting and characterising acute and chronic internal derangement injuries of the knee and helps guide patient management. This article reviews the current clinical practice of MRI evaluation and interpretation of meniscal, ligamentous, cartilaginous, and synovial disorders within the knee that are commonly encountered.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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