Article
Surgery
Yan Jin, Pingyue Li, Yiming Yang, Xianli Zeng, Hongyuan Shen, Lihang Zhang, Tsung-Yuan Tsai, Jiarong Chen
Summary: This study aimed to introduce and verify the reliability of a new reference axis for tibial rotation in total knee arthroplasty (TKA). A coordinate system was established based on the standard TKA tibial cut, and specific lines were identified as the reference axis. The reliability of the new axis was evaluated by measuring the angle between the reference lines and a specific axis. The results showed that the new reference axis had excellent intra- and inter-observer reliability, making it a preferred option for rotational alignment of the tibial component in TKA.
FRONTIERS IN SURGERY
(2022)
Article
Orthopedics
Jocelyn Compton, Jessell Owens, Jesse Otero, Nicolas Noiseux, Timothy Brown
Summary: Obesity does not affect the coronal plane alignment of the tibial component when using an extramedullary guide during primary TKA in this study population.
JOURNAL OF KNEE SURGERY
(2021)
Article
Orthopedics
Qianjin Wang, Xiaofeng Zhang, Tianshu Shi, Zhengyuan Bao, Bin Wang, Yao Yao, Dengxian Wu, Zheng Liu, Honggang Cai, Dongyang Chen, Jin Dai, Qing Jiang, Zhihong Xu
Summary: This retrospective study compared the accuracy of postoperative limb alignment using two femoral alignment techniques in patients with severe coronal femoral bowing. The study found that the IM femoral cutting system is imprecise for the coronal alignment in severe lateral bowing of the femur, while the EM cutting system can achieve accurate alignment.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(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)
Article
Mathematics
Muhammad Sohail, Jaehyun Park, Jun Young Kim, Heung Soo Kim, Jaehun Lee
Summary: This passage describes the aim of successful total knee arthroplasty, which is to restore the natural range of motion of the infected joint. However, assigning a perfect coordinate system to the knee joint is a challenge. This study proposes a modified Whiteside's line method for the selection of the optimal TEA.
Article
Orthopedics
Sachin R. Tapasvi, Anshu Shekhar, Madhav Chowdhry, Matthew Dipane, Edward J. McPherson
Summary: This study compared the use of anterior-posterior axis line (APAL) versus transepicondylar axis line (TEAL) in patients undergoing simultaneous bilateral total knee arthroplasty (TKA), and found no significant difference in radiographic, operative, and clinical parameters except for postoperative radiographic limb alignment. Two-year follow-up indicated no difference in knee flexion and Oxford Knee Scores, with 75% of patients having no preference for either technique.
JOURNAL OF ARTHROPLASTY
(2022)
Article
Orthopedics
Hiroyasu Ogawa, Masaya Sengoku, Tetsuya Shimokawa, Yutaka Nakamura, Kazuichiro Ohnishi, Kazu Matsumoto, Haruhiko Akiyama
Summary: This study aimed to investigate the anatomical factors that affect ligament balancing in mechanically aligned total knee arthroplasty (MA-TKA). The results showed that extra-articular factors such as femoral valgus angle, mLDFA, and TSC were associated with the mediolateral imbalance of compartmental loading.
ORTHOPAEDICS & TRAUMATOLOGY-SURGERY & RESEARCH
(2022)
Article
Orthopedics
Matthew A. Follett, Prerna Arora, William J. Maloney, Stuart B. Goodman, James Huddleston, Derek F. Amanatullah
Summary: The technical differences between simultaneous and staged total knee arthroplasties (TKAs) can affect the clinical and radiographic outcomes. The study found that the second knee in simultaneous TKAs had a higher risk of establishing the mechanical axis outside neutral compared to staged TKAs. Staged TKAs had an increased risk of deep venous thrombosis. There were no significant differences in perioperative complications and range of motion between the two procedures.
JOURNAL OF ARTHROPLASTY
(2022)
Article
Orthopedics
Theofilos Karasavvidis, Cale A. Pagan Moldenhauer, Fares S. Haddad, Michael T. Hirschmann, Mark W. Pagnano, Jonathan M. Vigdorchik
Summary: In an effort to increase patient satisfaction with total knee arthroplasty (TKA), surgeons are gradually moving away from traditional neutral mechanical alignment (MA) towards individualized alignment techniques. This review discusses the differences in alignment techniques for TKA, the concept of knee phenotypes, and comparative studies between MA and individualized alignment. It also provides guidance for surgeons on incorporating individualized alignment into their practice. Alignment and implant positioning are now central to TKA, and a more personalized approach is being explored by surgeons.
JOURNAL OF ARTHROPLASTY
(2023)
Article
Orthopedics
Mingjiang He, Hongmei Zhang, Peiyan Hu, Lin Jing, Pengcheng Shan
Summary: A MEMS system based on spatial alignment and navigation technology was developed to assist with femoral extramedullary alignment osteotomy (FEAO) in total knee arthroplasty (TKA). The system can locate and adjust the femoral distal condylar osteotomy (FDCO) to achieve optimal femoral prosthesis placement. This portable navigation device provides a novel approach for FDCO.
ORTHOPAEDIC SURGERY
(2023)
Article
Surgery
Dejin Yang, Xiang-Dong Wu, Yixin Zhou, Xinghua Yin, Yong Huang, Hongyi Shao, Hao Tang
Summary: This study compared the morphology of resected tibial surface between valgus and well-aligned tibias in total knee arthroplasty. The results showed that patients with valgus tibias had smaller aspect ratios for the medial plateau, suggesting the need for consideration in tibial component design and selection.
FRONTIERS IN SURGERY
(2023)
Article
Orthopedics
Hideki Mizu-uchi, Hidehiko Kido, Tomonao Chikama, Kenta Kamo, Satoshi Kido, Yasuharu Nakashima
Summary: This study found that acceptable tibial coronal alignment can still be achieved even with some displacement of the distal end from the ideal position after adjusting the rotational alignment of the distal end of the guide to the AP axis of the proximal tibia.
JOURNAL OF KNEE SURGERY
(2022)
Article
Medicine, Research & Experimental
Richard Steer, Beth Tippett, R. Nazim Khan, Dermot Collopy, Gavin Clark
Summary: This study aims to compare the effects of traditional mechanically aligned knee arthroplasty and functional alignment knee arthroplasty on joint function scores and other relevant indicators after 2 years, to explore which surgical approach is more beneficial for patients.
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
Health Care Sciences & Services
Jobe Shatrov, Constant Foissey, Moussa Kafelov, Cecile Batailler, Stanislas Gunst, Elvire Servien, Sebastien Lustig
Summary: Functional alignment (FA) is a novel philosophy in total knee arthroplasty (TKA) that respects individual bony and soft tissue phenotypes within defined limits. This paper focuses on describing the rationale and technique of FA in the valgus morphotype using an image-based robotic platform. The principles for valgus phenotype involve personalized pre-operative planning, restoration of native coronal alignment, dynamic sagittal alignment, matching implant sizing, and achieving defined soft tissue laxity through implant manipulation. FA aims to restore constitutional alignment and balance soft tissue laxity by considering individual anatomy and variations within predefined boundaries.
JOURNAL OF PERSONALIZED MEDICINE
(2023)
Article
Clinical Neurology
Koichi Yoshikane, Katsuhiko Kikuchi, Ken Okazaki
Summary: This retrospective cohort study investigated the usefulness of selective single-level lumbar endoscopic unilateral laminotomy for bilateral decompression (LE-ULBD) in patients with radiological multilevel lumbar spinal stenosis (LSS). The study found that selective single-level LE-ULBD provided favorable results for multilevel LSS.
GLOBAL SPINE JOURNAL
(2023)
Article
Orthopedics
Ayano Kuwasawa, Ken Okazaki, Kuniko Noda, Takashi Fukushima, Kotaro Nihei
Summary: This study aimed to evaluate the clinical outcomes of intra-articular administration of adipose tissue-derived stem cells (ADSC) in knee osteoarthritis (OA). The results showed that patients with KL grade 2 or 3 had better clinical outcomes at 6 months, and the changes in KOOS scores were not related to changes in cartilage volumes.
JOURNAL OF ORTHOPAEDIC SCIENCE
(2023)
Article
Clinical Neurology
Tomohisa Inoue, Keiji Wada, Ayako Tominaga, Ryo Tamaki, Tomoya Hirota, Ken Okazaki
Summary: This study compared the accuracy of C-arm fluoroscopy and O-arm assisted surgery in pedicle screw placement in the cervicothoracic spinal junction. The results showed that O-arm assisted surgery improved the accuracy of pedicle screw placement.
WORLD NEUROSURGERY
(2022)
Article
Orthopedics
Junya Itou, Umito Kuwashima, Masafumi Itoh, Ken Okazaki
Summary: This study aimed to evaluate short-term clinical outcomes after Oxford UKA in knees with a greater degree of preoperative varus alignment. The results showed that PROMs improved significantly after surgery in these knees, and there was no significant difference between the severe varus group and the mild varus group.
JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH
(2022)
Article
Orthopedics
Ken Okazaki
Summary: Adopting joint line theory for bone resection can prevent the flexion gap tightness that likely occurs in cruciate-retaining TKA.
ORTHOPAEDIC SURGERY
(2022)
Article
Medicine, General & Internal
Umito Kuwashima, Masafumi Itoh, Junya Itou, Ken Okazaki
Summary: We present a case of tibial shaft fracture after open-wedge distal tibial tuberosity osteotomy (OWDTO). The use of a lag screw for lateral hinge fracture in OWDTO requires careful postoperative rehabilitation and follow-up. We discuss concerns regarding mechanical strength at the osteotomy site after OWDTO to prevent fracture.
CLINICAL CASE REPORTS
(2022)
Article
Orthopedics
Masafumi Itoh, Junya Itou, Ken Okazaki, Kiyotaka Iwasaki
Summary: This meta-analysis revealed that the risk of failure in ACL reconstruction surgery decreases significantly with each 0.5-mm increase in graft diameter. Within the range of 9.0 mm, the failure rate decreased from 3.63% to 1.79% as the graft diameter increased. Therefore, increasing the graft diameter appropriately is an effective strategy to reduce the risk of failure.
AMERICAN JOURNAL OF SPORTS MEDICINE
(2023)
Article
Cell & Tissue Engineering
M. Itoh, J. Itou, S. Imai, K. Okazaki, K. Iwasaki
Summary: This study investigated clinical trials of the use of decellularized tissue grafts in orthopaedic surgery and found that there are currently limited commercially available decellularized tissue products, especially for knee joint surgeries. However, the variety of available decellularized products has recently increased, and decellularized grafts may become a promising option in orthopaedic surgery.
BONE & JOINT RESEARCH
(2023)
Article
Orthopedics
Junya Itou, Masafumi Itoh, Umito Kuwashima, Ken Okazaki
Summary: The purpose of this study was to investigate the association between the flexion joint gap after ROCC TKA and clinical outcomes. The study found that lateral joint tightness in flexion decreases postoperative range of motion and PROMs.
JOURNAL OF ISAKOS JOINT DISORDERS & ORTHOPAEDIC SPORTS MEDICINE
(2023)
Article
Orthopedics
Junya Itou, Umito Kuwashima, Masafumi Itoh, Ken Okazaki
Summary: This study compared the incidence of deep vein thrombosis (DVT) after robotic-assisted total knee arthroplasty (RATKA) with conventional manual TKA (mTKA), and found no significant difference between the two.
JOURNAL OF EXPERIMENTAL ORTHOPAEDICS
(2023)
Article
Orthopedics
Junya Itou, Umito Kuwashima, Masafumi Itoh, Ken Okazaki
Summary: The aim of this study was to investigate the effect of OWHTO on preoperative neutral alignment of the knee. The study found that there were no significant differences in clinical outcomes between the neutral alignment group and the varus alignment group after OWHTO.
JOURNAL OF EXPERIMENTAL ORTHOPAEDICS
(2023)
Article
Immunology
Takeshi Mochizuki, Takaki Hori, Koichiro Yano, Katsunori Ikari, Ken Okazaki
Summary: This study aimed to evaluate changes in SARS-CoV-2 antibody titers before and after the booster dose of the BNT162b2 COVID-19 vaccine among health care workers. The results showed that the antibody titers significantly increased at 1 month after the booster dose and started to decrease from 1 to 6 months. Therefore, another booster may be needed soon to prevent infection.
CLINICAL AND EXPERIMENTAL VACCINE RESEARCH
(2023)
Article
Orthopedics
Junya Itou, Yutaro Munakata, Yujiro Kuramitsu, Hiromi Madarame, Ken Okazaki
Summary: This study retrospectively analyzed 182 consecutive cases of primary ALS THA in 164 patients, and found that the incidence of perioperative DVT was approximately 10%. Most DVTs occurred in the soleal vein of the lower leg and showed isoechoic or hypoechoic echogenicity. This has important clinical implications for the prevention and treatment of VTE in THA patients.
ORTHOPEDIC RESEARCH AND REVIEWS
(2023)
Article
Orthopedics
Junya Itou, Umito Kuwashima, Masafumi Itoh, Ken Okazaki
Summary: This study aimed to evaluate the clinical outcomes of medial open-wedge high tibial osteotomy (HTO) for medial meniscus posterior root tear (MMPRT) with neutral alignment. The results showed that favorable clinical results were obtained in the short term for patients with MMPRT and moderate varus alignment who underwent medial open-wedge HTO. Therefore, surgeons should consider the indications for medial open-wedge HTO when planning treatment for MMPRT with persistent knee pain.
JOURNAL OF EXPERIMENTAL ORTHOPAEDICS
(2022)
Article
Rheumatology
Haruki Tobimatsu, Katsunori Ikari, Koichiro Yano, Ken Okazaki
Summary: This study presented a 76-year-old patient with rheumatoid arthritis who underwent a double first metatarsal osteotomy to remove a large bony erosion and correct hallux valgus. The 30-month follow-up demonstrated excellent radiographical and patient-reported outcomes, suggesting a successful joint-preserving surgery approach for rheumatoid forefoot deformities.
MODERN RHEUMATOLOGY CASE REPORTS
(2021)