The Experts below are selected from a list of 5958 Experts worldwide ranked by ideXlab platform
Roberto Rossi - One of the best experts on this subject based on the ideXlab platform.
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medial opening wedge high tibial osteotomy for medial compartment overload arthritis in the Varus Knee prognostic factors
American Journal of Sports Medicine, 2014Co-Authors: Davide Edoardo Bonasia, Federico Dettoni, Gabriele Sito, Davide Blonna, A Marmotti, Matteo Bruzzone, Filippo Castoldi, Roberto RossiAbstract:Background:Medial opening wedge high tibial osteotomy (OWHTO) is a widely accepted procedure for the treatment of medial compartment arthritis of the Knee. Compared with closing wedge HTO, however, the outcomes of OWHTO reported in the literature are incomplete.Purpose:To identify the positive and negative prognostic factors related to the outcomes of OWHTO through an evaluation of midterm study results and survivorship analysis.Study Design:Case series; Level of evidence, 4.Methods:From January 2001 to December 2009, a total of 141 consecutive OWHTOs were performed in 123 patients. Only patients with symptomatic medial Knee overload/arthritis were included. The patients were evaluated preoperatively and at every follow-up visit with (1) the Knee Society score, (2) the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, (3) another self-evaluation scale, (4) long-leg radiographs, and (5) plain radiographs. Preoperative, intraoperative, and postoperative variables were investigate...
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the role of high tibial osteotomy in the Varus Knee
Journal of The American Academy of Orthopaedic Surgeons, 2011Co-Authors: Roberto Rossi, Davide Edoardo Bonasia, Annunziato AmendolaAbstract:Abstract High tibial osteotomy (HTO) is a widely performed procedure, and good results can be achieved with appropriate patient selection and precise surgical technique. Clinical indications include Varus alignment of the Knee associated with medial compartment arthrosis, Knee instability, medial compartment overload following meniscectomy, and osteochondral defects requiring resurfacing procedures. Coronal alignment (ie, Varus, valgus) and sagittal alignment (ie, tibial slope) should be thoroughly evaluated in all cases. Many techniques have been described for HTO, whether alone or in combination with other procedures (eg, anterior cruciate ligament reconstruction, meniscal transplant, cartilage resurfacing). Little direct evidence exists regarding the effectiveness of HTO alone or in combination with other procedures because of the lack of randomized controlled studies. However, it is commonly accepted that correct alignment is essential in achieving durable results.
Ashkan Vaziri - One of the best experts on this subject based on the ideXlab platform.
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effect of frontal plane tibiofemoral angle on the stress and strain at the Knee cartilage during the stance phase of gait
Journal of Orthopaedic Research, 2010Co-Authors: Nicholas H Yang, Hamid Nayebhashemi, Paul K Canavan, Ashkan VaziriAbstract:Subject-specific three-dimensional finite element models of the Knee joint were created and used to study the effect of the frontal plane tibiofemoral angle on the stress and strain distribution in the Knee cartilage during the stance phase of the gait cycle. Knee models of three subjects with different tibiofemoral angle and body weight were created based on magnetic resonance imaging of the Knee. Loading and boundary conditions were determined from motion analysis and force platform data, in conjunction with the muscle-force reduction method. During the stance phase of walking, all subjects exhibited a valgus-Varus-valgus Knee moment pattern with the maximum compressive load and Varus Knee moment occurring at approximately 25% of the stance phase of the gait cycle. Our results demonstrated that the subject with Varus alignment had the largest stresses at the medial compartment of the Knee compared to the subjects with normal alignment and valgus alignment, suggesting that this subject might be most susceptible to developing medial compartment osteoarthritis (OA). In addition, the magnitude of stress and strain on the lateral cartilage of the subject with valgus alignment were found to be larger compared to subjects with normal alignment and Varus alignment, suggesting that this subject might be most susceptible to developing lateral compartment Knee OA.
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effect of frontal plane tibiofemoral angle on the stress and strain at the Knee cartilage during the stance phase of gait
Journal of Orthopaedic Research, 2010Co-Authors: Nicholas Yang, Hamid Nayebhashemi, Paul K Canavan, Ashkan VaziriAbstract:Subject-specific three-dimensional finite element models of the Knee joint were created and used to study the effect of the frontal plane tibiofemoral angle on the stress and strain distribution in the Knee cartilage during the stance phase of the gait cycle. Knee models of three subjects with different tibiofemoral angle and body weight were created based on magnetic resonance imaging of the Knee. Loading and boundary conditions were determined from motion analysis and force platform data, in conjunction with the muscle-force reduction method. During the stance phase of walking, all subjects exhibited a valgus–Varus–valgus Knee moment pattern with the maximum compressive load and Varus Knee moment occurring at approximately 25% of the stance phase of the gait cycle. Our results demonstrated that the subject with Varus alignment had the largest stresses at the medial compartment of the Knee compared to the subjects with normal alignment and valgus alignment, suggesting that this subject might be most susceptible to developing medial compartment osteoarthritis (OA). In addition, the magnitude of stress and strain on the lateral cartilage of the subject with valgus alignment were found to be larger compared to subjects with normal alignment and Varus alignment, suggesting that this subject might be most susceptible to developing lateral compartment Knee OA. © 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:1539–1547, 2010
Paul K Canavan - One of the best experts on this subject based on the ideXlab platform.
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effect of frontal plane tibiofemoral angle on the stress and strain at the Knee cartilage during the stance phase of gait
Journal of Orthopaedic Research, 2010Co-Authors: Nicholas H Yang, Hamid Nayebhashemi, Paul K Canavan, Ashkan VaziriAbstract:Subject-specific three-dimensional finite element models of the Knee joint were created and used to study the effect of the frontal plane tibiofemoral angle on the stress and strain distribution in the Knee cartilage during the stance phase of the gait cycle. Knee models of three subjects with different tibiofemoral angle and body weight were created based on magnetic resonance imaging of the Knee. Loading and boundary conditions were determined from motion analysis and force platform data, in conjunction with the muscle-force reduction method. During the stance phase of walking, all subjects exhibited a valgus-Varus-valgus Knee moment pattern with the maximum compressive load and Varus Knee moment occurring at approximately 25% of the stance phase of the gait cycle. Our results demonstrated that the subject with Varus alignment had the largest stresses at the medial compartment of the Knee compared to the subjects with normal alignment and valgus alignment, suggesting that this subject might be most susceptible to developing medial compartment osteoarthritis (OA). In addition, the magnitude of stress and strain on the lateral cartilage of the subject with valgus alignment were found to be larger compared to subjects with normal alignment and Varus alignment, suggesting that this subject might be most susceptible to developing lateral compartment Knee OA.
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effect of frontal plane tibiofemoral angle on the stress and strain at the Knee cartilage during the stance phase of gait
Journal of Orthopaedic Research, 2010Co-Authors: Nicholas Yang, Hamid Nayebhashemi, Paul K Canavan, Ashkan VaziriAbstract:Subject-specific three-dimensional finite element models of the Knee joint were created and used to study the effect of the frontal plane tibiofemoral angle on the stress and strain distribution in the Knee cartilage during the stance phase of the gait cycle. Knee models of three subjects with different tibiofemoral angle and body weight were created based on magnetic resonance imaging of the Knee. Loading and boundary conditions were determined from motion analysis and force platform data, in conjunction with the muscle-force reduction method. During the stance phase of walking, all subjects exhibited a valgus–Varus–valgus Knee moment pattern with the maximum compressive load and Varus Knee moment occurring at approximately 25% of the stance phase of the gait cycle. Our results demonstrated that the subject with Varus alignment had the largest stresses at the medial compartment of the Knee compared to the subjects with normal alignment and valgus alignment, suggesting that this subject might be most susceptible to developing medial compartment osteoarthritis (OA). In addition, the magnitude of stress and strain on the lateral cartilage of the subject with valgus alignment were found to be larger compared to subjects with normal alignment and Varus alignment, suggesting that this subject might be most susceptible to developing lateral compartment Knee OA. © 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:1539–1547, 2010
Davide Edoardo Bonasia - One of the best experts on this subject based on the ideXlab platform.
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medial opening wedge high tibial osteotomy for medial compartment overload arthritis in the Varus Knee prognostic factors
American Journal of Sports Medicine, 2014Co-Authors: Davide Edoardo Bonasia, Federico Dettoni, Gabriele Sito, Davide Blonna, A Marmotti, Matteo Bruzzone, Filippo Castoldi, Roberto RossiAbstract:Background:Medial opening wedge high tibial osteotomy (OWHTO) is a widely accepted procedure for the treatment of medial compartment arthritis of the Knee. Compared with closing wedge HTO, however, the outcomes of OWHTO reported in the literature are incomplete.Purpose:To identify the positive and negative prognostic factors related to the outcomes of OWHTO through an evaluation of midterm study results and survivorship analysis.Study Design:Case series; Level of evidence, 4.Methods:From January 2001 to December 2009, a total of 141 consecutive OWHTOs were performed in 123 patients. Only patients with symptomatic medial Knee overload/arthritis were included. The patients were evaluated preoperatively and at every follow-up visit with (1) the Knee Society score, (2) the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, (3) another self-evaluation scale, (4) long-leg radiographs, and (5) plain radiographs. Preoperative, intraoperative, and postoperative variables were investigate...
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the role of high tibial osteotomy in the Varus Knee
Journal of The American Academy of Orthopaedic Surgeons, 2011Co-Authors: Roberto Rossi, Davide Edoardo Bonasia, Annunziato AmendolaAbstract:Abstract High tibial osteotomy (HTO) is a widely performed procedure, and good results can be achieved with appropriate patient selection and precise surgical technique. Clinical indications include Varus alignment of the Knee associated with medial compartment arthrosis, Knee instability, medial compartment overload following meniscectomy, and osteochondral defects requiring resurfacing procedures. Coronal alignment (ie, Varus, valgus) and sagittal alignment (ie, tibial slope) should be thoroughly evaluated in all cases. Many techniques have been described for HTO, whether alone or in combination with other procedures (eg, anterior cruciate ligament reconstruction, meniscal transplant, cartilage resurfacing). Little direct evidence exists regarding the effectiveness of HTO alone or in combination with other procedures because of the lack of randomized controlled studies. However, it is commonly accepted that correct alignment is essential in achieving durable results.
Masashi Neo - One of the best experts on this subject based on the ideXlab platform.
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hybrid high tibial osteotomy is superior to medial opening high tibial osteotomy for the treatment of Varus Knee with patellofemoral osteoarthritis
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Shuhei Otsuki, Yoshinori Okamoto, Tomohiko Murakami, Kosuke Nakagawa, Nobuhiro Okuno, Hitoshi Wakama, Masashi NeoAbstract:To evaluate patellofemoral congruity after opening wedge high tibial osteotomy (OWHTO) and hybrid HTO. Twenty-four Knees with hybrid HTO and 24 with OWHTO were evaluated in this study. The Caton–Deschamps and modified Miura–Kawamura indices were used to evaluate pre- and post-operative patellar heights for both types of surgery. Tibial tuberosity–trochlear groove (TT–TG) distance, patellar tilt, and medial and lateral joint space at the patellofemoral joint were compared. Anterior Knee pain was assessed using the Kujala anterior Knee pain scale. There was no significant difference between the correction angles of the hybrid HTO and OWHTO. Pre- and post-operative values for the Caton–Deschamps and modified Miura–Kawamura indices in patients who underwent hybrid HTO changed from 0.90 to 0.94 and from 0.95 to 1.03, respectively, with no significant differences noted. Following OWHTO, these values decreased significantly from 0.91 to 0.73 and from 1.06 to 0.84, respectively (p < 0.01). The post-operative patellar height after OWHTO was significantly lower than that after hybrid HTO (p < 0.01). After hybrid HTO, the TT–TG distance decreased significantly from 11.4 to 7.4 (p < 0.01), but it did not change significantly after OWHTO. Although pre- and post-operative patellar tilt were not altered significantly in either group, the medial joint space of the patellofemoral joint was significantly increased post-operatively following hybrid HTO (p = 0.035). The pre-operative Kujala scores were significantly lower in the hybrid HTO group, but post-operative scores improved in both groups. Hybrid HTO provides a better post-operative patellofemoral joint than does OWHTO with regard to patellar position and reduction of the TT–TG distance, as well as improved clinical outcomes. Hybrid HTO, rather than OWHTO, is the preferred technique for the treatment of Varus Knees combined with patellofemoral osteoarthritis. Retrospective comparative study, Level III.
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correlation between Varus Knee malalignment and patellofemoral osteoarthritis
Knee Surgery Sports Traumatology Arthroscopy, 2016Co-Authors: Shuhei Otsuki, Mikio Nakajima, Yoshinori Okamoto, Shuhei Oda, Yoshiaki Hoshiyama, Go Iida, Masashi NeoAbstract:Purpose To evaluate the relationship between patellofemoral osteoarthritis (OA) and Varus OA of the Knee with a focus on the location of joint space narrowing. Methods Eighty-five patients scheduled to undergo total Knee arthroplasty caused by Varus OA were enrolled in this study. The relationship between patellofemoral OA and Varus Knee malalignment was elucidated. To determine the alignment of the patellofemoral joint in Varus Knees, patellar tilt, and the tibial tuberosity–trochlear groove (TT–TG) distance were measured, and patellofemoral OA was classified using computed tomography. Results The femorotibial angles in patients with stage II–IV patellofemoral OA were significantly larger than those in patients with stage I patellofemoral OA, and the patellar tilt in patients with stage II–IV patellofemoral OA and the TT–TG distance in patients with stage IV patellofemoral OA were significantly larger than those in patients with stage I patellofemoral OA. The TT–TG distance was strongly correlated with patellar tilt (R 2 = 0.41, P < 0.001). Patellofemoral joint space narrowing was mainly noted at the lateral facet, and it was found on both sides as patellofemoral OA worsened. Conclusion Varus Knee malalignment was induced by patellofemoral OA, especially at the lateral facet. Patellar tilt and the TT–TG distance are considered critical factors for the severity of patellofemoral OA. Understanding the critical factors for patellofemoral OA in Varus Knees such as the TT–TG distance and patellar will facilitate the
