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  • 1
    In: Bone Reports, Elsevier BV, Vol. 14 ( 2021-04), p. 100844-
    Type of Medium: Online Resource
    ISSN: 2352-1872
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2821774-3
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  • 2
    In: Cancer Investigation, Informa UK Limited, Vol. 41, No. 2 ( 2023-02-07), p. 133-143
    Type of Medium: Online Resource
    ISSN: 0735-7907 , 1532-4192
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2023
    detail.hit.zdb_id: 2043112-0
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  • 3
    In: Journal of Bone Oncology, Elsevier BV, Vol. 25 ( 2020-12), p. 100329-
    Type of Medium: Online Resource
    ISSN: 2212-1374
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 2695887-9
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  • 4
    In: Journal of Clinical Medicine, MDPI AG, Vol. 9, No. 12 ( 2020-11-29), p. 3880-
    Abstract: The topical application of tranexamic acid (TXA) helps to prevent post-operative blood loss in total joint replacements. Despite these findings, the effects on articular and periarticular tissues remain unclear. Therefore, this in vitro study examined the effects of varying exposure times and concentrations of TXA on proliferation rates, gene expression and differentiation capacity of chondrocytes and human mesenchymal stromal cells (hMSCs), which underwent osteogenic differentiation. Chondrocytes and hMSCs were isolated and multiplied in monolayer cell cultures. Osteogenic differentiation of hMSCs was induced for 21 days using a differentiation medium containing specific growth factors. Cell proliferation was analyzed using ATP assays. Effects of TXA on cell morphology were examined via light microscopy and histological staining, while expression levels of tissue-specific genes were measured using semiquantitative RT-PCR. After treatment with 50 mg/mL of TXA, a decrease in cell proliferation rates was observed. Furthermore, treatment with concentrations of 20 mg/mL of TXA for at least 48 h led to a visible detachment of chondrocytes. TXA treatment with 50 mg/mL for at least 24 h led to a decrease in the expression of specific marker genes in chondrocytes and osteogenically differentiated hMSCs. No significant effects were observed for concentrations beyond 20 mg/mL of TXA combined with exposure times of less than 24 h. This might therefore represent a safe limit for topical application in vivo. Further research regarding in vivo conditions and effects on hMSC functionality are necessary to fully determine the effects of TXA on articular and periarticular tissues.
    Type of Medium: Online Resource
    ISSN: 2077-0383
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2662592-1
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  • 5
    In: Bone Reports, Elsevier BV, Vol. 14 ( 2021-04), p. 100860-
    Type of Medium: Online Resource
    ISSN: 2352-1872
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2821774-3
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  • 6
    In: Journal of Experimental Orthopaedics, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2022-12)
    Abstract: Despite much improved preoperative planning techniques accurate intraoperative assessment of the high tibial valgus osteotomy (HTO) remains challenging and often results in coronal over- and under-corrections as well as unintended changes of the posterior tibial slope. Noyes et al. reported a novel method for accurate intraoperative coronal and sagittal alignment correction based on a three-dimensional mathematical model. This is the first study examining preliminary data via the proposed Noyes approach for accurate intraoperative coronal and sagittal alignment correction during HTO. Methods From 2016 to 2020 a total of 24 patients (27 knees) underwent HTO applying the proposed Noyes method (Noyes-Group). Radiographic data was analyzed retrospectively and matched to patients that underwent HTO using the conventional method, i.e., gradual medial opening using a bone spreader under fluoroscopic control (Conventional-Group). All operative procedures were performed by an experienced surgeon at a single orthopaedic university center. Results From the preoperative to the postoperative visit no statistically significant changes of the posterior tibial slope were noted in the Noyes-Group compared to a significant increase in the Conventional-Group ( p  = 0.01). Regarding the axial alignment no significant differences between both groups were observed pre- and postoperatively. The number of over- and under-corrections did not differ significantly between both groups. Linear regression analysis showed a significant correlation of the postoperative medial proximal tibial angle (MPTA) with the position of the weightbearing line on the tibial plateau. Conclusion The 3-triangle method by Noyes seems to be a promising approach for preservation of the posterior tibial slope during HTO.
    Type of Medium: Online Resource
    ISSN: 2197-1153
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2780021-0
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  • 7
    In: Journal of Experimental Orthopaedics, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2022-08-19)
    Abstract: The AMADEUS (Area Measurement And DEpth and Underlying Structures) scoring and grading system has been proposed for the MRI based evaluation of untreated focal chondral defects around the knee. The clinical practicability, its correlation with arthroscopically assessed grading systems (ICRS – International Cartilage Repair Society) and thereby its clinical value in terms of decision making and guiding prognosis was yet to determine. Methods From 2008 to 2019 a total of 89 individuals were indicated for high tibial valgus osteotomy (HTO) due to tibial varus deformity and concomitant chondral defects of the medial compartment of the knee. All patients received a preoperative MRI (1.5 Tesla or 3.0 Tesla) and pre-osteotomy diagnostic arthroscopy. Chondral defects of the medial compartment were scored and graded with the MRI based AMADEUS by three independent raters and compared to arthroscopic defect grading by the ICRS system. Interrater and intrarater reliability as well as correlation analysis with the ICRS classification system were assessed. Results Intraclass correlation coefficients for the various subscores of the AMADEUS showed an overall good to excellent interrater agreement (min: 0.26, max: 0.80). Intrarater agreement turned out to be substantially inferior (min: 0.08, max: 0.53). Spearman correlation revealed an overall moderate correlative association of the AMADEUS subscores with the ICRS classification system, apart from the defect area subscore. Sensitivity of the AMADEUS to accurately identify defect severity according to the ICRS was 0.7 (0.69 for 3.0 Tesla MRI, 0.67 for 1.5 Tesla MRI). The mean AMADEUS grade was 2.60 ± 0.81 and the mean ICRS score 2.90 ± 0.63. Conclusions Overall, the AMADEUS with all its subscores shows moderate correlation with the arthroscopic chondral grading system according to ICRS. This suggests that chondral defect grading by means of the MRI based AMADEUS is well capable of influencing and guiding treatment decisions. Interrater reliability shows overall good agreement.
    Type of Medium: Online Resource
    ISSN: 2197-1153
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2780021-0
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  • 8
    In: Applied Sciences, MDPI AG, Vol. 12, No. 4 ( 2022-02-21), p. 2239-
    Abstract: (1) Background: The mesenchymal stromal cells (MSCs) of different tissue origins are applied in cell-based chondrogenic regeneration. However, there is a lack of comparability determining the most suitable cell source for the tissue engineering (TE) of cartilage. The purpose of this study was to compare the in vitro chondrogenic potential of MSC-like cells from different tissue sources (bone marrow, meniscus, anterior cruciate ligament, synovial membrane, and the infrapatellar fat pad removed during total knee arthroplasty (TKA)) and define which cell source is best suited for cartilage regeneration. (2) Methods: MSC-like cells were isolated from five donors and expanded using adherent monolayer cultures. Differentiation was induced by culture media containing specific growth factors. Transforming growth factor (TGF)-ß1 was used as the growth factor for chondrogenic differentiation. Osteogenesis and adipogenesis were induced in monolayer cultures for 27 days, while pellet cell cultures were used for chondrogenesis for 21 days. Control cultures were maintained under the same conditions. After, the differentiation period samples were analyzed, using histological and immunohistochemical staining, as well as molecularbiological analysis by RT-PCR, to assess the expression of specific marker genes. (3) Results: Plastic-adherent growth and in vitro trilineage differentiation capacity of all isolated cells were proven. Flow cytometry revealed the clear co-expression of surface markers CD44, CD73, CD90, and CD105 on all isolated cells. Adipogenesis was validated through the formation of lipid droplets, while osteogenesis was proven by the formation of calcium deposits within differentiated cell cultures. The formation of proteoglycans was observed during chondrogenesis in pellet cultures, with immunohistochemical staining revealing an increased relative gene expression of collagen type II. RT-PCR proved an elevated expression of specific marker genes after successful differentiation, with no significant differences regarding different cell source of native tissue. (4) Conclusions: Irrespective of the cell source of native tissue, all MSC-like cells showed multipotent differentiation potential in vitro. The multipotent differentiation capacity did not differ significantly, and chondrogenic differentiation was proven in all pellet cultures. Therefore, cell suitability for cell-based cartilage therapies and tissue engineering is given for various tissue origins that are routinely removed during total knee arthroplasty (TKA). This study might provide essential information for the clinical tool of cell harvesting, leading to more flexibility in cell availability.
    Type of Medium: Online Resource
    ISSN: 2076-3417
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2704225-X
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  • 9
    In: Foot & Ankle International, SAGE Publications, Vol. 38, No. 7 ( 2017-07), p. 760-766
    Abstract: Bone marrow edema syndrome (BMOS) is a phenomenon primarily affecting the lower extremity. It is characterized by a sudden onset of pain and an ill-defined osseous hyperintense signal in magnetic resonance imaging. The main cause of BMOS is still largely unknown. Its pathophysiology is presumably multifactorial and it has recently been demonstrated that it usually involves an increase in bone turnover and alterations within the bone microenvironment. Vitamin D plays a pivotal role in maintaining a healthy and well-balanced bone microenvironment. However, to date only limited information has been reported on vitamin D status in patients with BMOS. Moreover, it is still uncertain whether hypovitaminosis D is associated with the etiology and course of the disease. For this reason, the aim of this study was to determine serum vitamin D levels (25(OH)D) of patients diagnosed with BMOS of the foot and ankle. Methods: Patients were identified and laboratory results collected by retrospective review of the medical records between year 2011 and 2015. Diagnosis was based on clinical examination, the existence of prolonged foot pain, the presence of abnormal bone marrow signal intensity in T1- and T2-weighted magnetic resonance imaging, and the patient’s medical history. All patients who demonstrated other concomitant diagnoses were excluded from the study. Results: Overall, 31 patients were affected by BMOS with a mean age of 44.4 (range, 18-76) years. Notably, 84% of patients (26/31) had low vitamin D levels with a mean 25(OH)D level of 19.03 ng/mL. Specifically, 61% of patients (19/31) were vitamin D deficient, 23% (7/31) vitamin D insufficient, and only 5 patients (16%) had sufficient vitamin D levels. Statistical analysis showed no significant difference comparing vitamin D levels with patient age, sex, and time of diagnosis. Moreover, there was no correlation between vitamin D status and the number of bony foci or location of BMOS. Conclusion: We found a widespread rate of vitamin D deficiency in patients presenting with BMOS of the foot and ankle. Comparing these data to the vitamin D status of the general population in Germany and to patients living in comparable latitudes, this raises the possibility that BMOS might be associated with low vitamin D status. Level of Evidence: Level IV, retrospective case series.
    Type of Medium: Online Resource
    ISSN: 1071-1007 , 1944-7876
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2129503-7
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  • 10
    In: SICOT-J, EDP Sciences, Vol. 7 ( 2021), p. 44-
    Abstract: Introduction : High tibial medial open-wedge valgus osteotomy (HTO) is a well-established procedure for unicompartimental medial osteoarthritis of the young and active patient. However, the influence of cartilage defects of the lateral compartment on the total outcome remains obscure. Methods : From 2005 to 2012, a total of 63 patients underwent HTO for medial osteoarthritis of the knee at a single university orthopaedic center. Baseline data as well as intraoperative findings, including the grade and location of cartilage lesions, were evaluated retrospectively. Two groups were formed regarding the integrity of the lateral tibiofemoral compartment as measured by the Outerbridge score (group A: no lateral cartilage defects, group B: mild to moderate lateral cartilage defects). Functional outcome was assessed using the Knee and Osteoarthritis Outcome Score (KOOS), including its five subscores. Results : Comparing pre- and postoperative data, we identified an overall benefit of the HTO procedure as measured by the KOOS. Group A (no lateral cartilage defects) showed an increase in all five KOOS subscores ( p  = 0.00–0.01), whereas for group B (mild to moderate lateral cartilage defects), only two KOOS subscores revealed a significant increase ( p  = 0.03–0.04). There was also a statistically significant difference in the total KOOS score with higher values for group A at the postoperative visit. Cartilage defects with a higher Outerbridge score were associated with lower postoperative KOOS subscores. Discussion : Mild to moderate cartilage defects of the lateral compartment humble the total outcome after HTO procedure. Thus, indication for HTO should be made very carefully if any degree of lateral cartilage degeneration is present.
    Type of Medium: Online Resource
    ISSN: 2426-8887
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2021
    detail.hit.zdb_id: 2832091-8
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