The Experts below are selected from a list of 9309 Experts worldwide ranked by ideXlab platform
Toshifumi Ozaki - One of the best experts on this subject based on the ideXlab platform.
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Transtibial fixation for Medial Meniscus posterior root tear reduces posterior extrusion and physiological translation of the Medial Meniscus in middle-aged and elderly patients
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yuya Kodama, Shin Masuda, Takayuki Furumatsu, Yoshiki Okazaki, Yusuke Kamatsuki, Yuki Okazaki, Takaaki Hiranaka, Shinichi Miyazawa, Masaharu Yasumitsu, Toshifumi OzakiAbstract:Purpose To investigate changes in meniscal extrusion during knee flexion before and after pullout fixation for Medial Meniscus posterior root tear (MMPRT) and determine whether these changes correlate with articular cartilage degeneration and short-term clinical outcomes. Methods Twenty-two patients (mean age 58.4 ± 8.2 years) diagnosed with type II MMPRT underwent open magnetic resonance imaging preoperatively, 3 months after transtibial fixation and at 12 months after surgery, when second-look arthroscopy was also performed. The Medial Meniscus Medial extrusion (MMME) and the Medial Meniscus posterior extrusion (MMPE) were measured at knee 10° and 90° flexion at which Medial Meniscus (MM) posterior translation was also calculated. Articular cartilage degeneration was assessed using International Cartilage Research Society grade at primary surgery and second-look arthroscopy. Clinical evaluations included Knee Injury and Osteoarthritis Outcome Score, International Knee Documentation Committee subjective knee evaluation form, Lysholm score, Tegner activity level scale, and pain visual analogue scale. Results MMPE at 10° knee flexion was higher 12 months postoperatively than preoperatively (4.8 ± 1.5 vs. 3.5 ± 1.2, p = 0.01). MMPE at 90° knee flexion and MM posterior translation were smaller 12 months postoperatively than preoperatively (3.5 ± 1.1 vs. 4.6 ± 1.3, 7.2 ± 1.7 vs. 8.9 ± 2.0, p
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Time-Dependent Increase in Medial Meniscus Extrusion after Medial Meniscus Posterior Root Tear Analyzed by Using Magnetic Resonance Imaging
Knee surgery & related research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p
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time dependent increase in Medial Meniscus extrusion after Medial Meniscus posterior root tear analyzed by using magnetic resonance imaging
Knee Surgery and Related Research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p<0.001). A good correlation was observed between ΔMME and the interval of MRI scans (R2=0.621), and the MME progression rate was 0.020 mm per day. A moderate correlation was observed between the MME increase rate and the MJSW (R2=0.432). Conclusions: The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME. Level of Evidence: V, Cross-sectional study
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Meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee-flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:Purpose The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. Methods This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. Results On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p
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meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p < 0.001). All parameters did not differ between the three groups on postoperative MRI. In addition, the posterior width and extrusion of the Medial Meniscus were decreased significantly after meniscal repair concurrent with ACL reconstruction. This study demonstrated that the Medial Meniscus shifted posteriorly at 90° of knee flexion in ACL-deficient knees complicated with Medial Meniscus tears. Medial meniscal repair concurrent with ACL reconstruction improved the deformed morphology and posterior extrusion. MRI measurements of the posterior extrusion at the knee-flexed position may be clinically useful to assess the functional improvement of the Medial Meniscus following meniscal repair combined with ACL reconstruction. III.
Takayuki Furumatsu - One of the best experts on this subject based on the ideXlab platform.
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Transtibial fixation for Medial Meniscus posterior root tear reduces posterior extrusion and physiological translation of the Medial Meniscus in middle-aged and elderly patients
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yuya Kodama, Shin Masuda, Takayuki Furumatsu, Yoshiki Okazaki, Yusuke Kamatsuki, Yuki Okazaki, Takaaki Hiranaka, Shinichi Miyazawa, Masaharu Yasumitsu, Toshifumi OzakiAbstract:Purpose To investigate changes in meniscal extrusion during knee flexion before and after pullout fixation for Medial Meniscus posterior root tear (MMPRT) and determine whether these changes correlate with articular cartilage degeneration and short-term clinical outcomes. Methods Twenty-two patients (mean age 58.4 ± 8.2 years) diagnosed with type II MMPRT underwent open magnetic resonance imaging preoperatively, 3 months after transtibial fixation and at 12 months after surgery, when second-look arthroscopy was also performed. The Medial Meniscus Medial extrusion (MMME) and the Medial Meniscus posterior extrusion (MMPE) were measured at knee 10° and 90° flexion at which Medial Meniscus (MM) posterior translation was also calculated. Articular cartilage degeneration was assessed using International Cartilage Research Society grade at primary surgery and second-look arthroscopy. Clinical evaluations included Knee Injury and Osteoarthritis Outcome Score, International Knee Documentation Committee subjective knee evaluation form, Lysholm score, Tegner activity level scale, and pain visual analogue scale. Results MMPE at 10° knee flexion was higher 12 months postoperatively than preoperatively (4.8 ± 1.5 vs. 3.5 ± 1.2, p = 0.01). MMPE at 90° knee flexion and MM posterior translation were smaller 12 months postoperatively than preoperatively (3.5 ± 1.1 vs. 4.6 ± 1.3, 7.2 ± 1.7 vs. 8.9 ± 2.0, p
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Time-Dependent Increase in Medial Meniscus Extrusion after Medial Meniscus Posterior Root Tear Analyzed by Using Magnetic Resonance Imaging
Knee surgery & related research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p
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time dependent increase in Medial Meniscus extrusion after Medial Meniscus posterior root tear analyzed by using magnetic resonance imaging
Knee Surgery and Related Research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p<0.001). A good correlation was observed between ΔMME and the interval of MRI scans (R2=0.621), and the MME progression rate was 0.020 mm per day. A moderate correlation was observed between the MME increase rate and the MJSW (R2=0.432). Conclusions: The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME. Level of Evidence: V, Cross-sectional study
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Meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee-flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:Purpose The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. Methods This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. Results On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p
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meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p < 0.001). All parameters did not differ between the three groups on postoperative MRI. In addition, the posterior width and extrusion of the Medial Meniscus were decreased significantly after meniscal repair concurrent with ACL reconstruction. This study demonstrated that the Medial Meniscus shifted posteriorly at 90° of knee flexion in ACL-deficient knees complicated with Medial Meniscus tears. Medial meniscal repair concurrent with ACL reconstruction improved the deformed morphology and posterior extrusion. MRI measurements of the posterior extrusion at the knee-flexed position may be clinically useful to assess the functional improvement of the Medial Meniscus following meniscal repair combined with ACL reconstruction. III.
Yoshiki Okazaki - One of the best experts on this subject based on the ideXlab platform.
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Transtibial fixation for Medial Meniscus posterior root tear reduces posterior extrusion and physiological translation of the Medial Meniscus in middle-aged and elderly patients
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yuya Kodama, Shin Masuda, Takayuki Furumatsu, Yoshiki Okazaki, Yusuke Kamatsuki, Yuki Okazaki, Takaaki Hiranaka, Shinichi Miyazawa, Masaharu Yasumitsu, Toshifumi OzakiAbstract:Purpose To investigate changes in meniscal extrusion during knee flexion before and after pullout fixation for Medial Meniscus posterior root tear (MMPRT) and determine whether these changes correlate with articular cartilage degeneration and short-term clinical outcomes. Methods Twenty-two patients (mean age 58.4 ± 8.2 years) diagnosed with type II MMPRT underwent open magnetic resonance imaging preoperatively, 3 months after transtibial fixation and at 12 months after surgery, when second-look arthroscopy was also performed. The Medial Meniscus Medial extrusion (MMME) and the Medial Meniscus posterior extrusion (MMPE) were measured at knee 10° and 90° flexion at which Medial Meniscus (MM) posterior translation was also calculated. Articular cartilage degeneration was assessed using International Cartilage Research Society grade at primary surgery and second-look arthroscopy. Clinical evaluations included Knee Injury and Osteoarthritis Outcome Score, International Knee Documentation Committee subjective knee evaluation form, Lysholm score, Tegner activity level scale, and pain visual analogue scale. Results MMPE at 10° knee flexion was higher 12 months postoperatively than preoperatively (4.8 ± 1.5 vs. 3.5 ± 1.2, p = 0.01). MMPE at 90° knee flexion and MM posterior translation were smaller 12 months postoperatively than preoperatively (3.5 ± 1.1 vs. 4.6 ± 1.3, 7.2 ± 1.7 vs. 8.9 ± 2.0, p
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Time-Dependent Increase in Medial Meniscus Extrusion after Medial Meniscus Posterior Root Tear Analyzed by Using Magnetic Resonance Imaging
Knee surgery & related research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p
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time dependent increase in Medial Meniscus extrusion after Medial Meniscus posterior root tear analyzed by using magnetic resonance imaging
Knee Surgery and Related Research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p<0.001). A good correlation was observed between ΔMME and the interval of MRI scans (R2=0.621), and the MME progression rate was 0.020 mm per day. A moderate correlation was observed between the MME increase rate and the MJSW (R2=0.432). Conclusions: The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME. Level of Evidence: V, Cross-sectional study
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Meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee-flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:Purpose The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. Methods This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. Results On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p
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meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p < 0.001). All parameters did not differ between the three groups on postoperative MRI. In addition, the posterior width and extrusion of the Medial Meniscus were decreased significantly after meniscal repair concurrent with ACL reconstruction. This study demonstrated that the Medial Meniscus shifted posteriorly at 90° of knee flexion in ACL-deficient knees complicated with Medial Meniscus tears. Medial meniscal repair concurrent with ACL reconstruction improved the deformed morphology and posterior extrusion. MRI measurements of the posterior extrusion at the knee-flexed position may be clinically useful to assess the functional improvement of the Medial Meniscus following meniscal repair combined with ACL reconstruction. III.
Yusuke Kamatsuki - One of the best experts on this subject based on the ideXlab platform.
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Transtibial fixation for Medial Meniscus posterior root tear reduces posterior extrusion and physiological translation of the Medial Meniscus in middle-aged and elderly patients
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yuya Kodama, Shin Masuda, Takayuki Furumatsu, Yoshiki Okazaki, Yusuke Kamatsuki, Yuki Okazaki, Takaaki Hiranaka, Shinichi Miyazawa, Masaharu Yasumitsu, Toshifumi OzakiAbstract:Purpose To investigate changes in meniscal extrusion during knee flexion before and after pullout fixation for Medial Meniscus posterior root tear (MMPRT) and determine whether these changes correlate with articular cartilage degeneration and short-term clinical outcomes. Methods Twenty-two patients (mean age 58.4 ± 8.2 years) diagnosed with type II MMPRT underwent open magnetic resonance imaging preoperatively, 3 months after transtibial fixation and at 12 months after surgery, when second-look arthroscopy was also performed. The Medial Meniscus Medial extrusion (MMME) and the Medial Meniscus posterior extrusion (MMPE) were measured at knee 10° and 90° flexion at which Medial Meniscus (MM) posterior translation was also calculated. Articular cartilage degeneration was assessed using International Cartilage Research Society grade at primary surgery and second-look arthroscopy. Clinical evaluations included Knee Injury and Osteoarthritis Outcome Score, International Knee Documentation Committee subjective knee evaluation form, Lysholm score, Tegner activity level scale, and pain visual analogue scale. Results MMPE at 10° knee flexion was higher 12 months postoperatively than preoperatively (4.8 ± 1.5 vs. 3.5 ± 1.2, p = 0.01). MMPE at 90° knee flexion and MM posterior translation were smaller 12 months postoperatively than preoperatively (3.5 ± 1.1 vs. 4.6 ± 1.3, 7.2 ± 1.7 vs. 8.9 ± 2.0, p
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Time-Dependent Increase in Medial Meniscus Extrusion after Medial Meniscus Posterior Root Tear Analyzed by Using Magnetic Resonance Imaging
Knee surgery & related research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p
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time dependent increase in Medial Meniscus extrusion after Medial Meniscus posterior root tear analyzed by using magnetic resonance imaging
Knee Surgery and Related Research, 2019Co-Authors: Yoshiki Okazaki, Takayuki Furumatsu, Yusuke Kamatsuki, Yuki Okazaki, Yasunori Shimamura, Kenta Saiga, Hideki Ohashi, Takahiko Uchino, Toshifumi OzakiAbstract:Purpose: Medial Meniscus posterior root tear (MMPRT) causes progression of Medial Meniscus extrusion (MME). This study aims to calculate the progression rate of MME based on findings in two preoperative magnetic resonance imaging (MRI) scans and determine the associated factors. Materials and Methods: We retrospectively reviewed 33 patients (27 females and 6 males; mean age, 60 years) who underwent MRI twice, at a mean interval of 48 days. We measured the Medial Meniscus body width, Medial joint space width (MJSW), and MME. The MME progression rate was derived from regression analysis of the increase in MME (ΔMME) between the two MRI scans. In addition, the correlations of the MME increase rate with age, body mass index, femorotibial angle, and MJSW were evaluated. Results: The mean MME increased from 3.4 mm to 4.5 mm (p<0.001). A good correlation was observed between ΔMME and the interval of MRI scans (R2=0.621), and the MME progression rate was 0.020 mm per day. A moderate correlation was observed between the MME increase rate and the MJSW (R2=0.432). Conclusions: The MME progression rate was rapid in MMPRT and narrowing of the MJSW was associated with the progression of MME. Level of Evidence: V, Cross-sectional study
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Meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee-flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:Purpose The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. Methods This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. Results On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p
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meniscal repair concurrent with anterior cruciate ligament reconstruction restores posterior shift of the Medial Meniscus in the knee flexed position
Knee Surgery Sports Traumatology Arthroscopy, 2019Co-Authors: Yoshiki Okazaki, Shin Masuda, Takayuki Furumatsu, Yusuke Kamatsuki, Yuya Kodama, Shinichi Miyazawa, Tomohito Hino, Toshifumi OzakiAbstract:The purpose of this study was to evaluate the shape and shift of the Medial Meniscus before and after meniscal repair concurrent with anterior cruciate ligament (ACL) reconstruction using magnetic resonance imaging (MRI) at 90° of knee flexion. This study included 18 patients with ACL-deficient knees without Meniscus tears (group A), 11 patients with Medial Meniscus tears alone (group M), and 15 patients with ACL-deficient knees complicated with Medial Meniscus tears (group AM). The posterior segment shape was evaluated using open MRI at 90° of knee flexion preoperatively and at 3 months postoperatively. The length, height, width, and posterior extrusion of the Medial Meniscus and posterior tibiofemoral distance were measured. These measurements were compared between the three groups. On preoperative MRI, a significant difference was observed in the posterior extrusion of the Medial Meniscus (group A, 1.2 ± 0.5 mm; group M, 1.7 ± 0.3 mm; group AM, 4.1 ± 1.5 mm, p < 0.001). All parameters did not differ between the three groups on postoperative MRI. In addition, the posterior width and extrusion of the Medial Meniscus were decreased significantly after meniscal repair concurrent with ACL reconstruction. This study demonstrated that the Medial Meniscus shifted posteriorly at 90° of knee flexion in ACL-deficient knees complicated with Medial Meniscus tears. Medial meniscal repair concurrent with ACL reconstruction improved the deformed morphology and posterior extrusion. MRI measurements of the posterior extrusion at the knee-flexed position may be clinically useful to assess the functional improvement of the Medial Meniscus following meniscal repair combined with ACL reconstruction. III.
Michael R. Krogsgaard - One of the best experts on this subject based on the ideXlab platform.
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Tibial avulsion fracture of the posterior root of the Medial Meniscus in children
Knee Surgery Sports Traumatology Arthroscopy, 2012Co-Authors: Jonas Vestergård Iversen, Michael R. KrogsgaardAbstract:Few reports have described avulsion fractures of the posterior root of the Medial Meniscus in skeletally immature patients. This lesion should not be overlooked as it damages the load absorptive (distributive) function of the Meniscus, increasing the risk of cartilage degeneration. Two cases of displaced avulsion fractures of the posterior root of the Medial Meniscus in children are presented along with a concise report of the literature regarding avulsion fractures of the posterior root of the Medial Meniscus. Both avulsions were reattached arthroscopically by trans-tibial pull-out sutures with a good clinical result at 2-years follow-up, and in one case, the avulsion was found at re-arthroscopy after 6 weeks to have healed.
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Tibial avulsion fracture of the posterior root of the Medial Meniscus in children
Knee surgery sports traumatology arthroscopy : official journal of the ESSKA, 2012Co-Authors: Jonas Vestergård Iversen, Michael R. KrogsgaardAbstract:Few reports have described avulsion fractures of the posterior root of the Medial Meniscus in skeletally immature patients. This lesion should not be overlooked as it damages the load absorptive (distributive) function of the Meniscus, increasing the risk of cartilage degeneration. Two cases of displaced avulsion fractures of the posterior root of the Medial Meniscus in children are presented along with a concise report of the literature regarding avulsion fractures of the posterior root of the Medial Meniscus. Both avulsions were reattached arthroscopically by trans-tibial pull-out sutures with a good clinical result at 2-years follow-up, and in one case, the avulsion was found at re-arthroscopy after 6 weeks to have healed. Level of evidence IV.