Article
Orthopedics
Ahmed Siddiqi, Hiba Anis, Ilya Borukhov, Nicolas S. Piuzzi
Summary: This study analyzed CT scans of healthy and osteoarthritic knees and found significant differences in the posterior condylar axis, condylar offset, and condylar radius, as well as tibial slope in both the sagittal and coronal planes.
JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME
(2022)
Article
Health Care Sciences & Services
Yaron Bar Ziv, Ahmad Essa, Konstantin Lamykin, Najib Chacar, Gilad Livshits, Salah Khatib, Yoav Comaya, Noam Shohat
Summary: The study aimed to evaluate the safety and functional outcomes of excessive varus cuts in kinematic alignment total knee arthroplasty. The results showed that unrestricted tibial component cuts in kinematic alignment total knee arthroplasty were safe and efficient in relieving pain and restoring function for at least two years.
JOURNAL OF PERSONALIZED MEDICINE
(2022)
Review
Medicine, General & Internal
Eugenio Cammisa, Iacopo Sassoli, Matteo La Verde, Stefano Fratini, Vito Gaetano Rinaldi, Giada Lullini, Vittorio Vaccari, Stefano Zaffagnini, Giulio Maria Marcheggiani Muccioli
Summary: This review discusses the outcomes of bilateral knee arthroplasty in patients with windswept deformity (WSD). The results show that knee replacement surgery improves knee function and reduces axial deviation in both valgus and varus knees. Unicompartmental knee arthroplasty (UKA) allows for limited axial correction, while kinematic alignment (KA) provides similar results in both knees. The choice of implant is important for functional outcomes.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Orthopedics
Yanfeng Jia, Leilei Zhai, Shiqi Qin, Juncai Xu, Wei Gao, Boxuan Zhang, Xiaofeng Wang, Kezhen Zhou, Zhiwen Sun, Yingzhen Niu, Hongwei Bao, Ran Sun
Summary: This study aimed to investigate the relationship between lower limb alignment and soft tissue balance after total knee arthroplasty (TKA). The results showed that the relaxation of soft tissues around the knee joint changed over time after TKA, but this change did not significantly affect the alignment of the lower limbs.
BMC MUSCULOSKELETAL DISORDERS
(2023)
Article
Orthopedics
An-Sofie van de Kelft, Kris De Mulder, Jo De Schepper, Jan Victor, Bart Vundelinckx
Summary: The purpose of this study is to determine if the flexion first balancing technique leads to better restoration of joint line height and medial posterior condylar offset compared to the classic extension first gap balancing technique. The study also aims to show non-inferiority of the flexion first balancing technique in terms of clinical outcomes. The results showed that the flexion first balancing technique resulted in better preservation of posterior condylar offset, greater postoperative flexion, and better KOOS scores.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Haoran Lin, Qi Cheng, Guangjian Li, Jie Zhao, Qiang Wang
Summary: This study assessed the functional outcomes of mechanical alignment (MA) and kinematic alignment (KA) procedures in total knee arthroplasty (TKA) patients. The results showed that compared to the MA method, the KA procedure provided pain relief and improved active motion range within 6 weeks after the surgery. Additionally, the KA procedure significantly increased the Knee Disability and Osteoarthritis Outcome Score for Joint Replacement (KOOS JR) at 6 weeks, 6 months, and 1 year post-operation.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2023)
Article
Orthopedics
Naicheng Diao, Fei Yu, Bo Yang, Lifeng Ma, Heyong Yin, Ai Guo
Summary: This study investigated the relationship between changes in hip-knee-ankle (HKA) angle and hindfoot alignment after total knee arthroplasty (TKA) for varus knee osteoarthritis. The results showed that HFA was significantly adjusted by 3 months after TKA, and the change in HFA was weakly correlated with the change in HKA angle, with age impacting this correlation. In patients under 65 years old, there was a greater correlation between changes in HFA and HKA angle, while no correlation was observed in patients above 65 years old.
BMC MUSCULOSKELETAL DISORDERS
(2021)
Article
Orthopedics
Yong Zhi Khow, Ming Han Lincoln Liow, Merrill Lee, Jerry Yongqiang Chen, Ngai Nung Lo, Seng Jin Yeo
Summary: The study found significant correlations between posterior tibial slope (PTS), posterior condylar offset (PCO), and femoral sagittal angle (FSA). Surgeons should consider factors such as patient age, BMI, implant type, preoperative flexion, PTS, and preservation of PCO to achieve greater postoperative flexion. The optimal range for PTS is between 2 to 8 degrees, and PCO should be restored to 1.5 mm of native values.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Orthopedics
Chiara Suardi, Davide Stimolo, Luigi Zanna, Christian Carulli, Matassi Fabrizio, Roberto Civinini, Matteo Innocenti
Summary: The study aimed to determine the major factor contributing to varus osteoarthritic knee and its surgical implications in total knee arthroplasty. The results revealed that proximal tibia deformity was the major contributor to osteoarthritic varus knee alignment, suggesting that correction should primarily be made on the tibia during the surgery.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2022)
Review
Orthopedics
Xu-feng Wan, Yang Yang, Duan Wang, Hong Xu, Chao Huang, Zong-ke Zhou, Jin Xu
Summary: In patients with preoperative varus knees, residual mild varus alignment after total knee arthroplasty may lead to similar or superior outcomes compared to neutral alignment. However, the available evidence is insufficient to replace the current gold standard of neutral alignment. Severe varus alignment should be avoided.
ORTHOPAEDIC SURGERY
(2022)
Article
Biotechnology & Applied Microbiology
Dai-Soon Kwak, Yong Deok Kim, Nicole Cho, Yong In, Man Soo Kim, Dohyung Lim, In Jun Koh
Summary: The study demonstrates that kinematically aligned total knee arthroplasty (KA TKA) better reproduces native knee biomechanics during mid-flexion compared to mechanically aligned total knee arthroplasty (MA TKA). Restoration of the joint line after KA TKA effectively replicates the native mid-flexion rollback and medial collateral ligament (MCL) strain, resulting in superior outcomes and more natural knee sensations for patients.
BIOENGINEERING-BASEL
(2022)
Article
Orthopedics
Kai Zheng, Feng Zhu, Weicheng Zhang, Houyi Sun, Jun Zhou, Rongqun Li, Yaozeng Xu
Summary: The new alignment technique of arKA aims to treat severe varus deformity through balancing the extension and flexion gap, restoring the native pre-arthritic alignment, which may be a promising alignment strategy for severe varus deformity. Further studies and comparisons with other alignment techniques are needed to confirm its effectiveness.
ORTHOPAEDIC SURGERY
(2022)
Article
Orthopedics
Shigeru Takagi, J. David Blaha, Tomoharu Mochizuki
Summary: The study aimed to assess the clinical outcomes of revision total knee arthroplasty (TKA) using a medial-pivot implant, particularly in terms of stability and anterior knee pain. Results showed that revision TKA with the medial-pivot implant lowered the joint line and positioned the tibia anteriorly compared to primary TKA. Furthermore, medial pivot revision TKA significantly improved AP stability. Therefore, revision TKA using a medial-pivot design can improve stability and anterior knee pain.
JOURNAL OF ARTHROPLASTY
(2023)
Article
Orthopedics
Tomoyuki Matsumoto, Naoki Nakano, Kazunari Ishida, Yuichi Kuroda, Shinya Hayashi, Hirotsugu Muratsu, Ryosuke Kuroda
Summary: This study aimed to compare kinematically aligned total knee arthroplasty (KA-TKA) targeting the neutral ground mechanical axis (MA) with tibia-restricted modified KA-TKA. The study found that the ground KA-TKA group achieved a significantly deeper postoperative flexion angle compared to the modified KA-TKA group.
INTERNATIONAL ORTHOPAEDICS
(2023)
Article
Orthopedics
Benjamin L. Schelker, Celine S. Moret, Manuel P. Sava, Ruediger von Eisenhart-Rothe, Heiko Graichen, Markus P. Arnold, Vincent Leclercq, Michael T. Hirschmann
Summary: The purpose of this study was to investigate the influence of alignment strategy on bone resection in varus knee phenotypes by visualizing the corresponding bone sections. The results showed that different alignment strategies require different amounts of bone resection depending on the varus phenotype, and individual decision-making for the phenotype is more important than the dogmatically correct alignment strategy.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Naoki Umatani, Shinichi Kuriyama, Kohei Nishitani, Shinichiro Nakamura, Hiromu Ito, Shuichi Matsuda
Summary: This study evaluated the impact of specific lower limb morphological factors on mechanically aligned total knee arthroplasty (TKA). The results showed that femoral bowing affects the alignment of femoral components but has little impact on patient satisfaction.
EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY
(2023)
Correction
Orthopedics
Naoki Umatani, Shinichi Kuriyama, Kohei Nishitani, Shinichiro Nakamura, Hiromu Ito, Shuichi Matsuda
EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY
(2023)
Article
Orthopedics
Yugo Morita, Shinichi Kuriyama, Takahiro Maeda, Shinichiro Nakamura, Kohei Nishitani, Hiromu Ito, Shuichi Matsuda
Summary: This study used the finite element method to analyze data from patients with Type III lateral hinge fracture who underwent open-wedge high tibial osteotomy. Simulation models were developed to predict fracture occurrence, and it was found that a posterior osteotomy extension of at least 70% could prevent Type III LHF.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Shinichiro Nakamura, Yoshihisa Tanaka, Shinichi Kuriyama, Kohei Nishitani, Mutsumi Watanabe, Kenshiro Yamauchi, Young D. Song, Shuichi Matsuda
Summary: During single-bundle anterior cruciate ligament (ACL) reconstruction, the tunnel position of the tibia has a greater impact on knee kinematics than that of the femur. Using the anteromedial (AM) tibial attachment can restore normal knee kinematics, while using the posterolateral (PL) tibial attachment may result in residual rotational instability during high-demand activities.
JOURNAL OF KNEE SURGERY
(2023)
Article
Orthopedics
Young Dong Song, Shinichiro Nakamura, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Yugo Morita, Yusuke Yamawaki, Shuichi Matsuda
Summary: This study compared the motion, contact forces, and contact stress between mechanically aligned and kinematically aligned models in a medial pivot knee design. The results showed that the kinematically aligned models can achieve near-normal knee kinematics, but there may be higher contact stresses on the tibial insert.
JOURNAL OF KNEE SURGERY
(2023)
Article
Orthopedics
Kazuma Yabu, Shinichiro Nakamura, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Young Dong Song, Yugo Morita, Yusuke Yamawaki, Shuichi Matsuda
Summary: The study aimed to evaluate the mediolateral tilt in patients undergoing total knee arthroplasty (TKA) during stair ascent and examine its correlation with static measurements. The results showed that the dynamic mediolateral tilt varied throughout the stair ascent, while the static mediolateral tilt remained constant. There was no correlation between static and dynamic mediolateral tilts, suggesting that static lower limb alignment does not reflect coronal alignment during motion.
JOURNAL OF KNEE SURGERY
(2023)
Article
Rheumatology
Yugo Morita, Hiromu Ito, Shuji Kawaguchi, Kohei Nishitani, Shinichiro Nakamura, Shinichi Kuriyama, Tome Ikezoe, Tadao Tsuboyama, Noriaki Ichihashi, Yasuharu Tabara, Fumihiko Matsuda, Shuichi Matsuda
Summary: This study explored the relationship between systemic chronic diseases and locomotive syndrome. Results showed that hypertension, stroke, coronary heart disease, rheumatoid arthritis, and other chronic diseases were independently associated with locomotive syndrome. Osteoporosis and kidney disease were also significantly correlated with the worsening of locomotive dysfunction.
MODERN RHEUMATOLOGY
(2023)
Article
Rehabilitation
Gakuto Kitamura, Manabu Nankaku, Takuma Yuri, Shinichi Kuriyama, Shinichiro Nakamura, Kohei Nishitani, Ryosuke Ikeguchi, Shuichi Matsuda
Summary: This study used CART analysis to clarify the interactive combinations of various clinical factors associated with physical activity (PA) at 2 years after total knee arthroplasty (TKA). The results showed that gait speed (≥1.05m/s) at the acute phase after TKA was the primary predictor for postoperative PA at 2 years.
ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION
(2023)
Article
Rheumatology
Shigeo Yoshida, Kohei Nishitani, Hiroyuki Yoshitomi, Shinichi Kuriyama, Shinichiro Nakamura, Takayuki Fujii, Motoo Saito, Yu Kobori, Akinori Murakami, Koichi Murata, Hiromu Ito, Hideki Ueno, Shuichi Matsuda
Summary: This study aimed to investigate the impact of high tibial osteotomy (HTO) on the intraarticular microenvironment of osteoarthritic (OA) knees. The results showed that HTO attenuated synovial inflammation and changed macrophage polarization, suggesting an improved intraarticular environment.
ARTHRITIS & RHEUMATOLOGY
(2023)
Article
Orthopedics
Mutsumi Watanabe, Shinichi Kuriyama, Kohei Nishitani, Shinichiro Nakamura, Shuichi Matsuda
Summary: This study examined the relationship between postoperative posterior cruciate ligament (PCL) laxity and patient satisfaction after PCL-retaining total knee arthroplasty (CR-TKA). The results showed that moderate PCL laxity (2-4 mm) was associated with the highest postoperative satisfaction.
JOURNAL OF ARTHROPLASTY
(2023)
Article
Orthopedics
Shinichi Kuriyama, Kohei Nishitani, Shinichiro Nakamura, Shuichi Matsuda
Summary: This study evaluated the ability of a commercially available insert-shaped electronic force sensor to detect increased or decreased soft tissue tension during primary total knee arthroplasty (TKA). The sensor accurately identified increased joint loads associated with increased ligament tension and predicted knee flexion contracture. However, it did not accurately detect excessively decreased ligament tension.
Article
Multidisciplinary Sciences
Kohei Nishitani, Shinichi Kuriyama, Shinichiro Nakamura, Young Dong Song, Yugo Morita, Hiromu Ito, Shuichi Matsuda
Summary: This study investigates the biomechanical effect of excessive flexion of the femoral component in total knee arthroplasty (TKA). The results show that excessive flexion leads to abnormal kinematics and increased contact/ligament forces. Avoiding excessive flexion and maintaining mild flexion of the femoral component would provide better kinematics and biomechanical effects in TKA.
SCIENTIFIC REPORTS
(2023)
Article
Orthopedics
Takahiro Maeda, Shinichi Kuriyama, Shigeo Yoshida, Kohei Nishitani, Shinichiro Nakamura, Shuichi Matsuda
Summary: The objective of this study was to evaluate the elastic modulus of knee joint cartilage using macroscopic methods and compare it with gross and histological findings of degeneration. The results showed that the elastic modulus of cartilage decreased as cartilage degeneration progressed and was correlated with the severity of degeneration according to the ICRS grading system and the Mankin score.
Article
Rheumatology
Yugo Morita, Yoichiro Kamatani, Hiromu Ito, Shiro Ikegawa, Takahisa Kawaguchi, Shuji Kawaguchi, Meiko Takahashi, Chikashi Terao, Shuji Ito, Kohei Nishitani, Shinichiro Nakamura, Shinichi Kuriyama, Yasuharu Tabara, Fumihiko Matsuda, Shuichi Matsuda
Summary: This study aimed to develop an accurate genetic risk score for knee osteoarthritis in the Japanese population using a multi-population PRS and multi-trait PRS. The results showed that the multi-trait PRS, combined with traditional risk factors, significantly improved the predictive accuracy for knee osteoarthritis in the Japanese population.
ARTHRITIS RESEARCH & THERAPY
(2023)
Article
Rheumatology
Akio Umemoto, Takeshi Kuwada, Koichi Murata, Masahiro Shiokawa, Sakiko Ota, Yoshiki Murotani, Akihiro Itamoto, Kohei Nishitani, Hiroyuki Yoshitomi, Takayuki Fujii, Akira Onishi, Hideo Onizawa, Kosaku Murakami, Masao Tanaka, Hiromu Ito, Hiroshi Seno, Akio Morinobu, Shuichi Matsuda
Summary: This study investigated the role of anti-citrullinated osteopontin (anti-cit-OPN) antibodies in the pathogenesis of rheumatoid arthritis (RA). The results showed that approximately 44% of RA patients had anti-cit-OPN antibodies, which aggravated RA and decreased the survival rate of TNF inhibitors.
ARTHRITIS RESEARCH & THERAPY
(2023)