Article
Orthopedics
Edgar A. Wakelin, Sami Shalhoub, Jeffrey M. Lawrence, John M. Keggi, Jeffrey H. DeClaire, Amber L. Randall, Corey E. Ponder, Jan A. Koenig, Stephen Lyman, Christopher Plaskos
Summary: This study aimed to determine the association between medio-lateral gap balance in extension, midflexion, and flexion with improved outcome scores at one-year post-operatively. The results showed that achieving balanced or tighter medial compartment in extension, medial laxity compared to the final insert thickness in midflexion, and a medio-lateral imbalance of less than 1.5 mm in flexion generated significantly improved KOOS pain scores at one year. Combining these balance windows resulted in further improved outcomes, with the greatest improvement observed when all three targets were satisfied.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
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
Jeffrey A. Geller, Alirio J. deMeireles, Anastasia Gazgalis, Walkania Santos, Alexander L. Neuwirth, Roshan P. Shah, H. John Cooper
Summary: The study examined the association between compartment pressures during total knee arthroplasty (TKA) and patient-reported outcome measurements (PROMs). The results showed that higher medial compartment pressures were observed during TKA. However, although compartment pressures are an important factor, they are not the sole predictor of patient satisfaction.
JOURNAL OF ARTHROPLASTY
(2023)
Article
Orthopedics
Simon W. Young, Gavin W. Clark, Christina I. Esposito, Matthew Carter, Matthew L. Walker
Summary: This study aimed to compare initial alignment and balance using mechanical alignment (MA) and kinematic alignment (KA) techniques in total knee arthroplasty (TKA), and to analyze the percentage of knees that could achieve balance with limited adjustments to component position. The results showed that less than 5% of TKAs were initially balanced. Limited adjustments to component position increased the percentage of TKAs that could be balanced, with no difference between MA and KA start points. A higher percentage of TKAs could be balanced when a greater range for lateral gap laxity was allowed. Balancing from KA resulted in increased joint line obliquity in the final implant alignment.
JOURNAL OF ARTHROPLASTY
(2023)
Article
Orthopedics
Atsuhito Kakuta, Ryo Ikeda, Biyu Takeshita, Tomoaki Takamatsu, Takuya Otani, Mitsuru Saito
Summary: This study evaluated the intraoperative changes in medial joint gap during total knee arthroplasty (TKA). The results showed that the medial joint gap significantly increased after posterior femoral condylar resection and posterior osteophyte removal. Surgeons need to measure the medial joint gap before and after each procedure or assume the changes in those values to achieve superior patient satisfaction following TKA.
Review
Orthopedics
Pawel Skowronek, Markus Arnold, Christian Starke, Agnieszka Bartyzel, Lukas B. Moser, Michael T. Hirschmann
Summary: This study reviewed the issue of malrotation of the femoral component after total knee arthroplasty, highlighting the recommendation to use 3D CT images to accurately evaluate the rotation of the femoral prosthetic component, especially in unsatisfied patients. It also found that the measured resection technique using at least two landmarks is preferred by surgeons for determining femoral component rotation.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2021)
Article
Orthopedics
Francesco Zambianchi, Andrea Giorgini, Andrea Ensini, Vincenzo Lombari, Valerio Daffara, Fabio Catani
Summary: The study investigated femoral component alignment in patients undergoing soft tissue-guided, navigated TKA. Results showed that with a mechanically aligned tibial component and tensioned soft tissues, the femoral component was placed at an average of 1.7 degrees varus in the coronal plane, aligning with the preoperative distal femoral joint line. Satisfactory knee function and excellent pain relief were demonstrated postoperatively based on KOOS and KSS scores.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2021)
Article
Orthopedics
Kazuki Sohmiya, Hiroyasu Ogawa, Yutaka Nakamura, Masaya Sengoku, Tetsuya Shimokawa, Kazuichiro Ohnishi, Haruhiko Akiyama
Summary: The reproducibility of gap measurements and the consistency of the gap distraction force produced by manual stress were investigated in this study. The results showed that the joint gap produced by manual stress is not reproducible depending on the surgeon's experience, and the distraction force applied by manual stress throughout the range of motion is not constant.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Biotechnology & Applied Microbiology
Tobias Winkler, Louisa Bell, Alwina Bender, Adam Trepczynski, Georg N. Duda, Alexander J. D. Baur, Philipp Damm
Summary: This study assessed the status of periarticular muscles in long-term follow-up after TKA and found that fatty infiltration reduction may lead to increased tibio-femoral joint contact forces. Functional muscle recovery after surgery is important for reducing joint loads and improving long-term outcomes of TKA.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Orthopedics
Ji Hoon Bae, Ja-Woon Lee, Soo-Hyun Kim, Sang-Gyun Kim, Young-Sik Jeon, Jeong Seok Choi
Summary: The study aimed to investigate the effects of the tibiofemoral synchronization technique on tibial torsion and lower limb rotation after primary total knee arthroplasty. The results showed that this technique had minimal impact on tibial torsion but resulted in changes in femoral anteversion and femoral neck-malleolar angle.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Medicine, General & Internal
Kao-Chang Tu, Han-Ting Shih, Shih-Chieh Tang, Cheng-Hung Lee, Wei-Jen Liao, Shun-Ping Wang
Summary: Maintaining gap balance is crucial for total knee arthroplasty (TKA). This study showed that resecting the posterior cruciate ligament (PCL) during TKA significantly increased the flexion gap but not the extension gap. The tensioning maneuver in open-chain was more effective in detecting gap differences before and after PCL resection.
JOURNAL OF CLINICAL MEDICINE
(2021)
Article
Orthopedics
Ryota Yamagami, Hiroshi Inui, Shuji Taketomi, Kenichi Kono, Kohei Kawaguchi, Sakae Tanaka
Summary: This study found that joint gap laxity during total knee arthroplasty is positively correlated with mediolateral laxity postoperatively, especially at mid-flexion angles. However, correlations weaken in patients with higher BMIs and when lower distraction forces are used for gap measurement.
Article
Medicine, General & Internal
Constantin Dlaska, Petros Ismailidis, Kenji Doma, Benjamin Brandon, Matthew Wilkinson, Kaushik Hazratwala
Summary: This study describes a technique for femoral component rotation in total knee arthroplasty using a tibia-first, gap-balancing, functional alignment approach. The results show that this technique allows for appropriate femoral rotation without resulting in patellar maltracking.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Engineering, Biomedical
Shin Sameshima, Hiroshi Inui, Shuji Taketomi, Ryota Yamagami, Kenichi Kono, Kohei Kawaguchi, Tomofumi Kage, Sakae Tanaka
Summary: The study found that key factors affecting the intraoperative gap difference include preoperative hip-knee-ankle angle and patient's body mass index, especially in the lateral compartment of the knee.
CLINICAL BIOMECHANICS
(2022)
Article
Orthopedics
Changjiao Sun, Zhe Zhao, Woo Guan Lee, Qi Ma, Xiaofei Zhang, Jianjin Zhu, Xu Cai
Summary: This study compared the clinical outcomes of sensor-guided balancing and conventional gap balancing techniques in total knee arthroplasty (TKA). The findings indicated that while sensor-guided balancing required more balancing procedures, it resulted in a reduction in the rate of manipulation under anesthesia.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2022)
Article
Orthopedics
Tomoyuki Matsumoto, Yoshinori Takashima, Koji Takayama, Kazunari Ishida, Naoki Nakano, Yuichi Kuroda, Masanori Tsubosaka, Tomoyuki Kamenaga, Takehiko Matsushita, Takahiro Niikura, Shinya Hayashi, Ryosuke Kuroda
Summary: Modified kinematically aligned total knee arthroplasty using single-radius or multi-radius prostheses showed similar clinical outcomes and patellar tracking when appropriate lateral retinacular release was performed.
JOURNAL OF KNEE SURGERY
(2022)
Article
Orthopedics
Yuichi Kuroda, Shingo Hashimoto, Masayoshi Saito, Tomoyuki Matsumoto, Naoki Nakano, Ryosuke Kuroda, Shinya Hayashi
Summary: This study found that the labral lengths in patients with developmental dysplasia of the hip were associated with radiographic parameters and the FEAR index. Specifically, the lateral labral length showed a strong positive correlation with the FEAR index, while the anterior labral length had a strong negative correlation with the anterior wall index.
ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY
(2022)
Article
Orthopedics
Masanori Tsubosaka, Hirotsugu Muratsu, Naoki Nakano, Tomoyuki Kamenaga, Yuichi Kuroda, Takao Inokuchi, Hidetoshi Miya, Ryosuke Kuroda, Tomoyuki Matsumoto
Summary: This study compared the medial preserving gap technique (MPGT) with the measured resection technique (MRT) in terms of postoperative knee stability after posterior-stabilized total knee arthroplasty (PS-TKA). The results showed that MPGT provided better postoperative medial knee stability, especially at 3 years after PS-TKA.
JOURNAL OF KNEE SURGERY
(2023)
Article
Orthopedics
Yoshinori Takashima, Tomoyuki Matsumoto, Naoki Nakano, Tomoyuki Kamenaga, Yuichi Kuroda, Shinya Hayashi, Takehiko Matsushita, Takahiro Niikura, Ryosuke Kuroda
Summary: The study aimed to investigate whether the transplantation of human cells from a non-reattached injured anterior cruciate ligament (ACL) remnant could enhance tendon-bone healing. The results showed that the non-reattachment group exhibited higher and earlier healing, with induction of endochondral ossification-like integration and mature bone ingrowth. This enhanced healing potential was attributed to increased intrinsic angiogenesis/osteogenesis. In comparison, the reattachment group showed poorer tendon-bone healing.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2023)
Article
Orthopedics
Tomoyuki Matsumoto, Naoki Nakano, Kazunari Ishida, Yoshinori Takashima, Toshihisa Maeda, Yuichi Kuroda, Shinya Hayashi, Tekehiko Matsushita, Takahiro Niikura, Hirotsugu Muratsu, Ryosuke Kuroda
Summary: This study aimed to compare intraoperative soft-tissue balance and clinical outcomes of kinematically aligned total knee arthroplasty (KA-TKA) using single-radius (SR) or multiradius (MR) prostheses. The results showed that joint component gaps differed between the two groups during flexion, with the SR group having significantly larger gaps at 60 to 120 degrees. However, there were no significant differences in varus/valgus balance and postoperative clinical outcomes between the two groups.
JOURNAL OF KNEE SURGERY
(2023)
Article
Orthopedics
Yoshinori Takashima, Naoki Nakano, Kazunari Ishida, Tomoyuki Kamenaga, Masanori Tsubosaka, Yuichi Kuroda, Shinya Hayashi, Ryosuke Kuroda, Tomoyuki Matsumoto
Summary: The study aims to compare the differences in trochlear shape and knee anatomy between four types of prostheses and preoperative native knee. It was found that the prostheses had a deeper and more medial trochlear groove compared to the native knee under kinematic alignment.
JOURNAL OF KNEE SURGERY
(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
Tomoyuki Matsumoto, Naoki Nakano, Shinya Hayashi, Koji Takayama, Toshihisa Maeda, Kazunari Ishida, Yuichi Kuroda, Takehiko Matsushita, Takahiro Niikura, Hirotsugu Muratsu, Ryosuke Kuroda
Summary: This study compared the prosthetic orientation, limb alignment, soft tissue balance, and early clinical outcomes between the use of a handheld robot and a conventional alignment guide for TKA. Results showed that the robot group had better accuracy in prosthetic orientation, stable soft tissue balance, and higher patient-reported scores for early clinical outcomes compared to the control group.
INTERNATIONAL ORTHOPAEDICS
(2023)
Article
Orthopedics
Tomoyuki Matsumoto, Naoki Nakano, Kazunari Ishida, Toshihisa Maeda, Shotaro Tachibana, Yuichi Kuroda, Shinya Hayashi, Takehiko Matsushita, Ryosuke Kuroda
Summary: This study aimed to present a ground kinematically aligned (KA)-total knee arthroplasty (TKA) technique, which targets the hip-to-calcaneus axis as an alternative to the conventional hip-to-talus axis. The results showed that using ground KA-TKA can achieve individual physiological alignment and may provide a more similar alignment to the native knee compared to other kinematic alignment techniques.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2023)
Article
Orthopedics
Kenichi Kikuchi, Naoki Nakano, Kazunari Ishida, Yuichi Kuroda, Shinya Hayashi, Masanori Tsubosaka, Tomoyuki Kamenaga, Takehiko Matsushita, Ryosuke Kuroda, Tomoyuki Matsumoto
Summary: This study investigated the influence of different surgical techniques on lower limb alignment after total knee arthroplasty. The results showed that there were no significant changes in alignment parameters between the mechanically aligned TKA group and the kinematically aligned TKA group after surgery. However, preoperative varus deformity was associated with a change in alignment deviation after surgery.
JOURNAL OF KNEE SURGERY
(2023)
Article
Cell & Tissue Engineering
Kensuke Anjiki, Tomoyuki Matsumoto, Yuichi Kuroda, Masahiro Fujita, Shinya Hayashi, Naoki Nakano, Masanori Tsubosaka, Tomoyuki Kamenaga, Yoshinori Takashima, Kenichi Kikuchi, Kenmei Ikuta, Yuma Onoi, Shotaro Tachibana, Yoshihito Suda, Kensuke Wada, Takehiko Matsushita, Ryosuke Kuroda
Summary: This study aimed to investigate the therapeutic effects of heterogeneous cells in rabbit stromal-vascular fraction (SVF) on rabbit chondrocytes. It was found that the SVF group showed superior therapeutic effects compared to the low-dose adipose-derived stromal cells (lADSC) group. The SVF group mainly consisted of M2 macrophages, which secreted growth factors and chondrocyte-protective cytokines, benefiting chondrocytes and knee joint homeostasis.
STEM CELL REVIEWS AND REPORTS
(2023)
Article
Cell & Tissue Engineering
Masahiro Fujita, Tomoyuki Matsumoto, Satoshi Sobajima, Masanori Tsubosaka, Takehiko Matsushita, Hideki Iwaguro, Ryosuke Kuroda
Summary: This study aimed to compare the clinical and radiological outcomes of single and double stromal vascular fraction (SVF) cell injections in patients with knee osteoarthritis (OA). The results showed that the total WOMAC score improved significantly in the single injection group from 3 to 24 months, while the double injection group showed significant improvement at 24 months. In conclusion, double injections may provide better treatment outcomes for patients with severe varus knee alignment.
CELL TRANSPLANTATION
(2023)
Article
Endocrinology & Metabolism
Koji Nukuto, Takehiko Matsushita, Kohei Kamada, Kyohei Nishida, Kanto Nagai, Noriyuki Kanzaki, Yuichi Hoshino, Tomoyuki Matsumoto, Takahiro Niikura, Ryosuke Kuroda
Summary: This study successfully developed the first MMPRT mouse model, which can be used to investigate the pathological changes of MMPRT.
CALCIFIED TISSUE INTERNATIONAL
(2023)
Article
Orthopedics
Masahiro Fujita, Shinya Hayashi, Tomoyuki Kamenaga, Takaaki Fujishiro, Tomoyuki Matsumoto, Ryosuke Kuroda
Summary: The objective of this study was to investigate the influence of preserving hip capsular ligaments on leg length and femoral offset discrepancy following total hip arthroplasty.
ACTA ORTOPEDICA BRASILEIRA
(2022)
Article
Orthopedics
Masahiro Fujita, Takafumi Hiranaka, Tomoyuki Kamenaga, Masanori Tsubosaka, Naoki Nakano, Shinya Hayashi, Ryosuke Kuroda, Tomoyuki Matsumoto
Summary: This study investigated the relationship between PFJ degeneration and clinical outcomes following lateral UKA, as well as the changes in lower-limb and PFJ alignment. The results showed significant improvement in clinical scores after lateral UKA, no significant progression in PFJ degeneration, tilting angle, and lateral shift, and no negative impact of knee-joint alignment correction on PFJ condition.
JOURNAL OF KNEE SURGERY
(2022)
Article
Engineering, Biomedical
Mitchel A. Magrini, Rashelle Hoffman, Taylor Barnett, Jennifer Bruursema, Jacob Siedlik
Summary: This study aimed to assess the effect of a multicomponent rehabilitation protocol on functional outcomes in a post-acute care facility. The results showed that the protocol was able to improve clinical mobility and balance outcomes, such as gait speed, balance scores, and sit-to-stand velocity, in medically complex older patients.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
K. Doslikova, N. D. Reeves, C. N. Maganaris, V. Baltzopoulos, S. M. P. Verschueren, F. P. Luyten, R. K. Jones, D. T. Felson, M. J. Callaghan
Summary: This study aimed to examine the effect of a sleeve knee brace on knee biomechanics during stair negotiation in patellofemoral joint osteoarthritis patients. The findings showed that the knee brace significantly reduced the maximal flexion angle, adduction angle, sagittal and frontal range of motion, and sagittal peak extension moment during stair ascent. During stair descent, the knee brace significantly reduced the maximal flexion angle and total sagittal range of motion compared to control.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
Savitha Subramaniam, Shuaijie Wang, Tanvi Bhatt
Summary: This study investigates the dance movement kinematics of people with chronic stroke under different types of assistance, including no assistance, safety harness assistance, and contact guard assistance with gait belt. The results show that there is a decrease in joint angle excursions in the no assistance condition compared to the safety harness assistance and contact guard assistance conditions for all song paces. The safety harness and contact guard assistance conditions have similar levels of joint angle excursions, except for higher hip (slow and fast pace) and ankle (medium pace) joint angle excursions in the contact guard assistance condition compared to the safety harness assistance condition.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
Richa Gupta, Lauren Judkins, Chet S. Friday, Joseph B. Ulsh, Stephen J. Kovach III, Samir Mehta, Charles Tomonto, Guha Manogharan, Michael W. Hast
Summary: The study compared novel additively manufactured rib implants with a clinically used Control implant, finding that the novel implants had better construct stiffness and rotational performance than the control group, with all implants failing via bone fracture in the end.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
Matteo Cioni, Antonino Casabona, Rosario Ferlito, Mariangela Pisasale, Domenico Marco Romeo, Giulia Messina, Maria Stella Valle
Summary: The study aimed to investigate the temporal changes of electromyographic activity in lower limb muscles during walking after injecting botulinum toxin A into the calf muscles of children with spastic cerebral palsy. The results showed that botulinum toxin A had a significant effect on electromyographic activity, with the most noticeable changes occurring between 4 and 8 weeks post-injection and full recovery at 16 weeks. Significant changes in muscle co-contraction were also observed on the treadmill.
CLINICAL BIOMECHANICS
(2024)
Review
Engineering, Biomedical
Vitor La Banca, Joao Artur Bonadiman, Felipe Fernandes Gonzalez, Jonathan Adam Gustafson, Gustavo Leporace, Grant E. Garrigues, Jorge Chahla, Leonardo Metsavaht
Summary: Background: Latissimus dorsi transfer is a surgical procedure that can be used for treating posterosuperior rotator cuff tears. However, there is still no consensus on the biomechanical changes resulting from latissimus dorsi transfer.
Methods: We performed a systematic review of the literature on 3D motion analysis studies evaluating the effects of latissimus dorsi transfer on shoulder kinematics.
Findings: Our meta-analysis revealed a significant improvement in forward flexion and abduction following latissimus dorsi transfer. When comparing the latissimus transferred shoulder with an uninjured contralateral side, the meta-analysis found no significant difference in flexion range of motion, while abduction and external rotation were significantly higher in the uninjured shoulders.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
Judith Bleuel, Igor Komnik, Iris Mittendorfer, Bjoern Michel, Steffen Willwacher
Summary: This study assessed the walking mechanics of patients with total knee arthroplasty during downhill hiking and compared them to a healthy control group. It was found that patients had lower knee flexion angles and weaker muscle strength compared to the controls. The muscle balance between quadriceps and hamstring muscles was related to the persistence of a stiff knee gait pattern after knee arthroplasty.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
Sangsoo Park, Hyun-Joon Yoo, Jin Su Jang, Sang-Heon Lee
Summary: This study utilizes a neural network to measure spine curvature, providing a real-time, automated, and non-contact method for measuring spine posture. The trained model demonstrates low error rates and holds potential for practical applications.
CLINICAL BIOMECHANICS
(2024)
Article
Engineering, Biomedical
Victor-Estuardo Leon-Roman, David Garcia-Mato, Irene Isabel Lopez-Torres, Javier Vaquero-Martin, Jose Antonio Calvo-Haro, Javier Pascau, Pablo Sanz-Ruiz
Summary: This study compared the tibial rotation between rotating hinge knee prosthesis and constrained condylar knee prosthesis in a clinical setting. The results showed that the postoperative Knee Injury and Osteoarthritis Outcome Score was significantly higher in the rotating hinge knee prosthesis group compared to the constrained condylar knee group, and the degrees of tibial rotation measured by inertial sensors were also significantly higher in the rotating hinge knee prosthesis group.
CLINICAL BIOMECHANICS
(2024)