Faculty Profiles - TAKEGAMI Yasuhiko

Papers - TAKEGAMI Yasuhiko

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Long-term oral meclozine administration improves survival rate and spinal canal stenosis during postnatal growth in a mouse model of achondroplasia in both sexes. Reviewed International journal

Hiroto Funahashi, Masaki Matsushita, Ryusaku Esaki, Kenichi Mishima, Bisei Ohkawara, Yasunari Kamiya, Yasuhiko Takegami, Kinji Ohno, Hiroshi Kitoh, Shiro Imagama

JBMR plus Vol. 8 ( 4 ) page： ziae018 2024.3

Language：English Publishing type：Research paper (scientific journal)

Achondroplasia (ACH) is a skeletal dysplasia characterized by short-limbed short stature caused by the gain-of-function mutations in the fibroblast growth factor receptor 3 (FGFR3) gene. Activated FGFR3, which is a negative regulator of bone elongation, impairs the growth of long bones and the spinal arch by inhibiting chondrocyte proliferation and differentiation. Most patients with ACH have spinal canal stenosis in addition to short stature. Meclozine has been found to inhibit FGFR3 via drug repurposing. A 10-d treatment with meclozine promoted long-bone growth in a mouse model of ACH (Fgfr3ach mice). This study aimed to evaluate the effects of long-term meclozine administration on promoting bone growth and the spinal canal in Fgfr3ach mice. Meclozine (2 mg/kg/d) was orally administered to Fgfr3ach mice for 5 d per wk from the age of 7 d to 56 d. Meclozine (2 mg/kg/d) significantly reduced the rate of death or paralysis and improved the length of the body, cranium, and long bones in male and female Fgfr3ach mice. Micro-computed tomography analysis revealed that meclozine ameliorated kyphotic deformities and trabecular parameters, including BMD, bone volume/tissue volume, trabecular thickness, and trabecular number at distal femur of Fgfr3ach mice in both sexes. Histological analyses revealed that the hypertrophic zone in the growth plate was restored in Fgfr3ach mice following meclozine treatment, suggesting upregulation of endochondral ossification. Skeletal preparations demonstrated that meclozine restored the spinal canal diameter in Fgfr3ach mice in addition to improving the length of each bone. The 2 mg/kg/d dose of meclozine reduced the rate of spinal paralysis caused by spinal canal stenosis, maintained the growth plate structure, and recovered the bone quality and growth of axial and appendicular skeletons of Fgfr3ach mice in both sexes. Long-term meclozine administration has the potential to ameliorate spinal paralysis and bone growth in patients with ACH.

DOI： 10.1093/jbmrpl/ziae018

A large preoperative pelvic oblique angle affects perception of leg length discrepancy after total hip arthroplasty. Reviewed

Genta Takemoto, Yusuke Osawa, Taisuke Seki, Yasuhiko Takegami, Daisaku Kato, Masanori Okamoto, Hiroki Iida, Shiro Imagama

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association Vol. 29 ( 2 ) page： 566 - 573 2024.3

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: In some cases, patients feel a perceived leg length discrepancy (P-LLD) despite no radiographic leg length discrepancy (R-LLD) after total hip arthroplasty (THA). We aimed to investigate the rate of postoperative P-LLD and the factors that cause postoperative P-LLD. METHODS: A retrospective study was conducted on 100 patients with R-LLD ≤5 mm after THA. Patients were classified into two groups based on P-LLD post-THA: group P (with P-LLD) and group E (without P-LLD). Relevant data on the general characteristics and radiological findings between the two groups were compared. RESULTS: We observed that 25 & 75% of patients belonged to group P and group E, respectively, with no significant difference in patient background. Postoperative Japanese Orthopedic Association (JOA) classification of pain and activities of daily living scores were significantly lower in group P than in group E (37.2 ± 3.9 vs. 39.1 ± 2.2, respectively; P = 0.013, and 16.2 ± 4.2 vs. 18.2 ± 2.2, respectively; P = 0.011). The preoperative pelvic oblique angle (POA) was significantly larger in group P than in group E (3.3 ± 2.3° vs. -0.2 ± 2.1°; respectively; P < 0.01). The pelvis tilted toward the surgical side was significantly higher in group P than in group E(88% vs 57%; respectively; P = 0.013). The preoperative C7 coronal vertical axis (C7 CVA) was significantly larger in group P than in group E (6.7 ± 14.7 mm vs. -0.2 ± 10.3 mm; respectively; P = 0.028). Multivariate logistic analysis revealed that preoperative POA (OR, 3.71; 95% CI: 1.86-8.12; P < 0.01) and the pelvis tilted toward the surgical side (OR, 4.14; 95% CI: 2.07-9.71; P = 0.022) were independent risk factors for P-LLD after THA. CONCLUSION: Even though there was no postoperative R-LLD, 25% of patients had P-LLD. A large preoperative POA and the pelvis tilted toward the surgical side were independent risk factors for P-LLD after THA.

DOI： 10.1016/j.jos.2023.01.013

Effect of anaesthesia on cemented hemiarthroplasty -A multicentre retrospective study (TRON study). Reviewed

Shigeto Yamamoto, Yasuhiko Takegami, Katsuhiro Tokutake, Ryo Nakashima, Kenta Naito, Keisuke Ogura, Daizo Kato, Shiro Imagama

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association Vol. 29 ( 2 ) page： 585 - 588 2024.3

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

INTRODUCTION: This study aimed to investigate the survival rate, postoperative complications, and walking ability in cemented hemiarthroplasty (HA) for displaced femoral neck fractures according to the anaesthesia method. METHODS: We conducted a retrospective study of a multicentre group (the TRON group). Three hundred fifty-eight patients who underwent cemented HA between 2015 and 2019 were selected; 289 patients of ≥75 years of age with no missing data were included. Patient background factors were matched and patients were assigned to spinal anaesthesia (SA) and general anaesthesia (GA) groups. The primary outcome was death at any time during the follow-up period. Secondary outcomes included postoperative complications and walking ability assessed using the Parker mobility score (PMS). Overall survival was evaluated using the Kaplan-Meier method, and differences were compared using the log-rank test. The incidence of each complication and PMS were compared between the two groups using Fisher's exact test. RESULTS: Overall survival during follow-up was significantly higher in the SA group in comparison to the GA group (p = 0.037). In the SA and GA groups, the survival rate at 3 months postoperatively was 98.4% and 95.5%, respectively. The incidence of postoperative pneumonia was significantly higher in the GA (p = 0.012), and PMS at 3 months postoperatively was significantly higher in the SA group (p = 0.016). CONCLUSION: The survival rate of elderly patients who underwent cemented HA was better in the SA group. General anaesthesia in cemented HA may be associated with lower life expectancy, increased incidence of pneumonia, and decreased walking ability.

DOI： 10.1016/j.jos.2023.02.005

Comparison of the Outcomes of Plating, Screw Fixation, and Pinning in Sanders Type II Fractures: A Multicenter (TRON) Retrospective Study. Reviewed International journal

Mihoko Kato, Yasuhiko Takegami, Katsuhiro Tokutake, Yuta Asami, Yu Takahashi, Hidetane Takahashi, Hiroaki Kumagai, Shiro Imagama

The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons Vol. 63 ( 2 ) page： 171 - 175 2024.3

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Calcaneus fractures Sanders type II have been historically treated with various modalities. However, few studies compared these procedures directly. The multicenter (TRON group) retrospective study compared the radiographic and clinical outcomes of operative procedures using Kirschner wires (K-wires), cannulated cancellous screws (CCSs) and plates. Between 2014 and 2020, 121 patients with Sanders type II calcaneus fractures were surgically treated in our group using K-wire (Group K: n = 31), CCS (Group C: n = 60) or plate (Group p: n = 30) fixation. We assessed the American Orthopedic Foot and Ankle Society (AOFAS) score and infection after operation as clinical outcomes and Böhler's and Preiss' angles as radiographic outcomes. The AOFAS scores of the 3 groups showed a significant difference, with Group P showing significantly inferior scores to Group C at 6 months postoperatively and at the final follow-up examination (p = .015 and p < .001, respectively). The rate of infection did not differ to a statistically significant extent, but the incidence in Group P tended to be higher in comparison to the other groups. Among the three groups, Böhler's angle did not differ to a statistically significant extent immediately after the operation (p = .113) or at the final follow-up examination (p = .383). Postoperatively, Preiss' angle did not differ to a statistically significant extent (p = .251) but was significantly smaller in the Group C at the final follow-up examination (p = .0331). In Sanders type II calcaneus fracture, CCS fixation may obtain the best functional outcomes.

DOI： 10.1053/j.jfas.2023.10.002

A Longitudinal Study on the Effect of Exercise Habits on Locomotive Syndrome and Quality of Life during the Coronavirus Disease 2019 Pandemic. Reviewed International journal Open Access

Sadayuki Ito, Hiroaki Nakashima, Naoki Segi, Jun Ouchida, Ryotaro Oishi, Ippei Yamauchi, Shinya Ishizuka, Yasuhiko Takegami, Taisuke Seki, Yukiharu Hasegawa, Shiro Imagama

Journal of clinical medicine Vol. 13 ( 5 ) 2024.3

Language：English Publishing type：Research paper (scientific journal)

During the COVID-19 pandemic, this study investigated the potential of exercise habits to improve quality of life (QOL) and prevent locomotive syndrome (LS) in residents of Yakumo-cho, Hokkaido, Japan. Participants from the 2018 health checkup were surveyed in February 2022, focusing on 200 respondents. These individuals were divided based on their 2018 exercise habits (at least 1 h per week): the exercise group (E group) and the non-exercise group (N group), further categorized in 2022 into the 2022E and 2022N groups. QOL was measured using the SF-36 (physical functioning, general health, physical role, physical pain, vitality, social functioning, emotional role, and mental health) and EuroQoL 5-dimension 5-level questionnaires (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression), and LS was assessed with the 25-question geriatric locomotive function scale. These showed no significant change in exercise habits from 2018 to 2022. In the non-LS group, the 2022E group had higher vitality and emotional role functioning scores compared to the 2022N group. For those with LS, the 2022E group reported less physical pain. Notably, the LS incidence was significantly lower in the 2022E group. This study concludes that consistent exercise habits positively impact QOL and reduce the LS risk, underscoring the importance of regular physical activity, especially during challenging times like a pandemic. These findings highlight the broader benefits of maintaining exercise routines for public health, particularly in periods of global health crises. Based on our findings, we recommend that people continue to exercise at least one hour per week to prevent LS.

DOI： 10.3390/jcm13051385

新型コロナウイルス感染症流行期間の生活様式および心身の変化とフレイルの関連 Reviewed

中江雅弥, 山田宏哉, 坪井良樹, 藤井亮輔, 奥深山寛, 渡邊真巳, 竹上靖彦, 石塚真哉, 中島宏彰, 今釜史郎, 鈴木康司

日本衛生学雑誌 Vol. 79 ( Suppl. ) page： S208 - S208 2024.3

高齢者上腕骨骨幹部骨折に対する治療方法が生命予後に与える影響手術治療と保存治療の比較 Reviewed

佐藤健, 竹上靖彦, 徳武克浩, 島本祐哉, 上野浩輝, 安藤智洋, 今釜史郎

日本整形外科学会雑誌 Vol. 98 ( 2 ) page： S224 - S224 2024.3

高齢者上腕骨骨幹部骨折の生命予後とその危険因子について多施設共同後方視的研究(TRON study) Reviewed

佐藤健, 竹上靖彦, 徳武克浩, 島本祐哉, 上野浩輝, 安藤智洋, 今釜史郎

日本整形外科学会雑誌 Vol. 98 ( 2 ) page： S224 - S224 2024.3

Cellular senescence is associated with osteonecrosis of the femoral head while mesenchymal stem cell conditioned medium inhibits bone collapse. Reviewed International journal Open Access

Masanori Okamoto, Hiroaki Nakashima, Kiyoshi Sakai, Yasuhiko Takegami, Yusuke Osawa, Junna Watanabe, Sadayuki Ito, Hideharu Hibi, Shiro Imagama

Scientific reports Vol. 14 ( 1 ) page： 3329 - 3329 2024.2

Language：English Publishing type：Research paper (scientific journal)

Osteonecrosis of the femoral head (ONFH) is a type of ischemic osteonecrosis that causes pain, loss of function, and femoral head collapse. Here, we analyzed samples of femoral heads excised from patients with ONFH to clarify the relationship between ischemic osteonecrosis and cellular senescence. X-gal staining was strong and p16INK4a-positive cells were abundant in the transitional region of ONFH. The β-galactosidase-positive cells in the transitional region were also positive for nestin, periostin, or DMP-1. In contrast, no β-galactosidase-positive cells were detected in the healthy region. The senescence-associated p16INK4a, p21, and p53 were upregulated in ONFH tissue. We also examined and analyzed a mouse ischemic femoral osteonecrosis model in vivo to verify the association between ONFH and cellular senescence. Human mesenchymal stem cell-conditioned medium (MSC-CM) was administered to determine its therapeutic efficacy against cellular senescence and bone collapse. MSC-CM reduced the number of senescent cells and downregulated the aforementioned senescence-related genes. It also decreased the number of empty lacunae 4 weeks after ischemia induction and promoted bone formation. At 6 weeks post-surgery, MSC-CM increased the trabecular bone volume, thereby suppressing bone collapse. We conclude that cellular senescence is associated with ONFH and that MSC-CM suppresses bone collapse in this disorder.

DOI： 10.1038/s41598-024-53400-w

Extension of the Antero-Posterior Necrotic Regions Associated With Collapse Cessation in Osteonecrosis of the Femoral Head. Reviewed International journal

Yusuke Osawa, Taisuke Seki, Yasuhiko Takegami, Masanori Okamoto, Hiroki Iida, Shiro Imagama

The Journal of arthroplasty Vol. 39 ( 2 ) page： 387 - 392 2024.2

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Collapse cessation is of utmost importance following a long period of collapse due to osteonecrosis of the femoral head (ONFH). This study investigated the relationship between collapse cessation and the extent of the necrotic regions of ONFH. METHODS: Overall, 74 patients who had symptomatic ONFH (collapse < 3 mm) at the first visit with a minimum follow-up of 3 years were included in this study. Patients were categorized based on collapse progression or cessation into the progression and stable groups. The extent of the antero-posterior (AP) and medio-lateral necrotic regions between the groups was assessed using sagittal and coronal sections of T1-magnetic resonance imaging. Additionally, the most effective cutoff value was determined from the receiving operating characteristic curve where collapse cessation could be obtained, while the survival rates were determined with collapse progression as the endpoints were evaluated. RESULTS: Overall, 45 and 29 patients were in the progression and stable groups, respectively. The AP and medio-lateral necrotic regions were significantly different (P < .01 and P < .01, respectively) between the progression and stable groups. A cutoff value of 62.1% of the AP necrotic regions was determined from the receiving operating characteristic curve analysis. The 5-year survival rates with collapse progression as the endpoints were 5.4 and 77.8% in the AP necrotic regions of ≥62.1 and <62.1%, respectively (P < .01). CONCLUSIONS: Cases with AP necrotic regions of ≤62.1% can be expected to have collapse cessation, which could be a useful index for ONFH treatment strategies. LEVEL OF EVIDENCE: Level IV.

DOI： 10.1016/j.arth.2023.08.020

Early versus delayed weight bearing after internal fixation for femoral neck fracture in younger adults: A multicenter retrospective study. Reviewed International journal

Kanta Hasegawa, Yasuhiko Takegami, Katsuhiro Tokutake, Hiroaki Nakashima, Kenichi Mishima, Kazuyoshi Kobayashi, Shiro Imagama

Injury Vol. 55 ( 2 ) page： 111292 - 111292 2024.2

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

INTRODUCTION: Femoral neck fracture (FNF) is among the most common and devastating injuries that orthopedic surgeons encounter. However, the incidence of FNF is lower in younger adults than in elderly individuals. In elderly FNF patients, early weight bearing (EWB) is preferred to prevent loss of function and decreased activity. In younger adults, some surgeons decide on delayed-weight bearing (DWB) after surgery because EWB may cause femoral neck shortening. We aimed to compare the postoperative results (clinical outcome, radiological evaluation, and complications) of EWB and DWB after FNF surgery in younger adults. METHODS: The study included 151 younger adults (age: ≤65 years at injury; nondisplaced, n = 100; displaced, n = 51) who underwent internal fixation at 11 university-affiliated hospitals in 2016-2020, and who were followed for ≥1 year. Patients were divided into the EWB (EWB in early postoperative period) and DWB (beginning weight bearing at 4 weeks after surgery) groups. The two groups were matched for age, and nondisplaced (EWB and DWB, both n = 24) and displaced (EWB and DWB, both n = 11) FNF were analyzed. The study items were age, sex, body mass index (BMI), Charlson Comorbidity Index (CCI), presence of diabetes, days waiting for surgery, fracture type, Parker mobility score (PMS) at last follow-up examination, pain (Numerical Rating Scale: NRS), radiological evaluation (femoral neck shortening, Canulated Cancellous screws (CCS) backout, and complications (nonunion, femoral head osteonecrosis). RESULTS: The patient backgrounds of the nondisplaced and displaced types did not differ. The PMS was significantly higher in the DWB group at the last follow-up examination (nondisplaced: 8.00±2.20 vs. 6.67±2.22, p = 0.005, displaced: 8.67±0.89 vs. 6.91±2.77, p<0.001). NRS and the amount of femoral neck shortening were significantly lower in the DWB group (nondisplaced: 1.65±0.70 mm vs. 3.94±3.03 mm, p<0.001, displaced: 4.26± 2.64 mm vs. 8.91±5.69 mm, p<0.001). CCS backout did not differ between the groups. One case of each of nonunion and femoral head osteonecrosis were observed in the displaced EWB and DWB groups; these differences were not significant. CONCLUSIONS: DWB after internal fixation for FNF in younger adults was associated with better outcomes than EWB.

DOI： 10.1016/j.injury.2023.111292

Do Postural and Walking Stabilities Change over a Decade by Aging? A Longitudinal Study. Reviewed International journal Open Access

Naoki Segi, Hiroaki Nakashima, Sadayuki Ito, Jun Ouchida, Ryotaro Oishi, Ippei Yamauchi, Yuichi Miyairi, Yoshinori Morita, Yasuhiko Takegami, Shinya Ishizuka, Taisuke Seki, Yukiharu Hasegawa, Shiro Imagama

Journal of clinical medicine Vol. 13 ( 4 ) 2024.2

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Previous studies have demonstrated that the center of gravity (COG) is more unstable in the elderly than in young people. However, it is unclear whether aging itself destabilizes the COG. This study aimed to investigate changes in COG sway and gait kinematics over time by a longitudinal study of middle-aged and elderly adults. METHODS: This study included 198 healthy middle-aged and elderly people who underwent stabilometry at ten-year intervals. The participants' mean age at baseline was 62.9 ± 6.5 years, and 77 (39%) of them were male. The results of stabilometry (mean velocity, sway area, postural sway center in the medial-lateral direction [X center], and postural sway center in the anterior-posterior direction [Y center]), and results of exercise tests (the height-adjusted maximum stride length [HMSL] and the 10 m walk test [10MWT]) were analyzed. The destabilized group with 11 participants, whose mean velocity exceeded 3 cm/s after 10 years, was compared with the stable group with 187 participants, whose mean velocity did not exceed 3 cm/s. RESULTS: Mean velocity increased significantly over ten years (open-eye, from 1.53 ± 0.42 cm to 1.86 ± 0.67 cm, p < 0.001); however, the sway area did not change significantly. X center showed no significant change, whereas Y center showed a significant negative shift (open-eye, from -1.03 ± 1.28 cm to -1.60 ± 1.56 cm, p < 0.001). Although the results of 10MWT and initial HMSL did not differ significantly, the HMSL in the destabilized group at ten years was 0.64, which was significantly smaller than the 0.72 of others (p = 0.019). CONCLUSIONS: The ten-year changes in COG sway in middle-aged and elderly adults were characterized by a significant increase in mean velocity but no significant difference in sway area. Because the destabilized group had significantly smaller HMSL at ten years, instability at the onset of movement is likely to be affected by COG instability.

DOI： 10.3390/jcm13041081

Association between locomotive syndrome and fall risk in the elderly individuals in Japan: The Yakumo study. Reviewed

Hiroki Iida, Taisuke Seki, Yasuhiko Takegami, Yusuke Osawa, Daisaku Kato, Genta Takemoto, Kei Ando, Shinya Ishizuka, Yukiharu Hasegawa, Shiro Imagama

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association Vol. 29 ( 1 ) page： 327 - 333 2024.1

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Patients with locomotive syndrome (LS) are poor ambulatory status and a high risk of requiring nursing care. The purpose of this study is to investigate the relationship between LS and fall risk among community-dwelling elderly individuals. METHODS: The subjects were Japanese elderly individuals aged 65 and over who participated in Yakumo study 2019 (N = 189). We defined the fall risk index 5 items version (FRI-5) ≥6 points as the fall risk group. LS was evaluated by stand-up test, two-step test, and 25-Geriatric Locomotive Function Scale (GLFS-25). We divided the subjects into two groups according to the presence or absence of fall risk, and investigated factors associated with fall risk. RESULTS: The fall risk group (30 patients, 15.9%) had higher GLSF-25 (P = 0.001). The results of logistic regression analysis adjusted for age, sex, BMI, and knee osteoarthritis revealed that GLFS-25 (OR: 1.052; 95%CI: 1.009-1.097) was independent factor associated with fall risk. In the ROC analysis, the optimal cut-off value of the GLFS-25 to predict fall risk was 12, which is equivalent to LS stage 1 (AUC 0.688; 95% CI: 0.588-0.787; sensitivity: 0.467, specificity: 0.836). CONCLUSIONS: GLFS-25 was associated with fall risk among community-dwelling elderly individuals aged 65 and over.

DOI： 10.1016/j.jos.2022.11.023

Early weight bearing versus late weight bearing after intramedullary nailing for distal femoral fracture (AO/OTA 33) in elderly patients: A multicenter propensity-matched study. Reviewed Open Access

Kentaro Komaki, Yasuhiko Takegami, Katsuhiro Tokutake, Masahiro Hanabayashi, Yutaro Kuwahara, Yotaro Yamada, Shiro Imagama

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association Vol. 29 ( 1 ) page： 268 - 272 2024.1

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: This study aimed to assess differences in implant failure and bone union rates, amount of change in alignment of lower extremities, and walking ability between early weight-bearing (EWB) and late weight-bearing (LWB) groups following retrograde intramedullary nailing (RIMN) for distal femoral fracture (AO/OTA 33) (DFF) at multiple centers using propensity score matching. METHODS: The data of 213 patients who underwent RIMN from 2012 to 2019 in multiple tertiary hospitals were extracted from our database. Cases with the following factors were excluded: age <60, open fracture, AO/OTA-type 33-C3 fracture, preoperative New Mobility Score (NMS) < 3, postoperative follow-up <3 months, and unknown weight-bearing start time. Eighty-four patients were divided into the EWB and LWB groups. EWB group patients were encouraged to perform partial weight-bearing walking at ≤4 weeks after surgery. LWB group patients were not allowed weight bearing for >4 weeks after surgery. After propensity score matching was applied, 26 cases remained in each group. RESULTS: There were no cases of nail failure in either the EWB group or LWB group (P = 1). Screw failure occurred in 0 cases in the EWB group and in 1 case (4.5%) in the LWB group (P = 1.0). Non-union occurred in 5 patients (19.2%) in the EWB group and 4 patients (15.3%) in the LWB group (P = 1). The mean amount of change in lower extremities alignment did not differ between the two groups. The median Knee Society Score was 95.5 (59-100) vs. 93 (72-100) points (P = 0.39). The median NMS was 7 (0-9) vs. 7 (4-9) points (P = 0.82). CONCLUSIONS: There were no significant intergroup differences in the rates of implant failure, bone union at one year after surgery, amount of change in lower extremities alignment, or walking ability. We suggest that early weight bearing after RIMN for DFF may not be harmful in elderly people.

DOI： 10.1016/j.jos.2022.10.023

What factors are associated with loss of alignment after open reduction and internal fixation for tibial plateau fractures? A retrospective multicenter (TRON group) study. Reviewed

Keita Shimizu, Yasuhiko Takegami, Katsuhiro Tokutake, Keita Naruse, Yoshito Sudo, Yuji Matsubara, Shiro Imagama

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association Vol. 29 ( 1 ) page： 286 - 291 2024.1

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Tibial plateau fractures (TPFs) are one of the most challenging intra-articular fractures to treat. Along with reconstruction of the articular surfaces, appropriate alignment of the knee joints must be obtained and maintained after open reduction and internal fixation (ORIF) for TPFs because loss of alignment (LA) is associated with worse clinical outcomes. We aimed to investigate and clarify the risk factors related to LA after ORIF for TPFs. METHODS: This multicenter, retrospective cohort study used data of hospitals of the Trauma Research Group (TRON group) from January 1, 2011, to December 31, 2020. Among 293 TPFs extracted from the database, we evaluated the alignment of the articular surface to the anatomical axis of the tibia in the immediate postoperative and last follow-up radiographs. We defined a change of alignment from the immediate postoperative radiograph as LA. We evaluated the risk factors of LA using univariate and multiple logistic regression analyses. RESULTS: LA was observed in 27 fractures (9.2%). In multiple logistic regression analyses, preoperative articular step-off and postoperative condylar widening were statistically associated with LA (OR = 1.1, 95% CI: 1.02-1.19 and P = 0.012; OR = 1.04, 95% CI: 1.00-1.08, P = 0.045, respectively). We calculated the threshold by drawing a receiver operating characteristic curve using the final regression model. The threshold of postoperative widening was 8.2 mm. We divided the 293 TPFs into two groups according to this threshold and determined differences between the two groups using Fisher's exact test. The two groups were statistically significantly different (P = 0.00502). CONCLUSIONS: Preoperative articular step-off and postoperative condylar widening could be associated with LA after ORIF for TPFs. We suggest that intraoperative restoration of condylar widening is important for the prevention of malalignment following ORIF for TPF.

DOI： 10.1016/j.jos.2022.12.008

Predictive factors for one-year mortality after surgery for periprosthetic femoral fracture: A retrospective multicenter (TRON group) study. Reviewed

Hiroshi Kurokawa, Yasuhiko Takegami, Katsuhiro Tokutake, Hideomi Takami, Manato Iwata, Satoshi Terasawa, Hidenori Inoue, Shiro Imagama

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association Vol. 29 ( 1 ) page： 299 - 305 2024.1

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Periprosthetic femoral fracture (PFF) after total hip arthroplasty (THA) or bipolar hip arthroplasty (BHA) represents a challenging situation and the treatment is associated with high rates of complications and mortality. The aims of this multicenter retrospective study were to determine 1-year mortality and to identify predictors associated with mortality, including patient characteristics and surgical factors, in patients undergoing surgery for PFF after THA or BHA. METHODS: We collected 249 cases of PPF after THA or BHA that were treated in our 11 hospitals (named the TRON group) between January 2010 and December 2019. We excluded patients who were conservatively treated, cases in which the 1-year postoperative outcome was unknown, and Vancouver type A cases. Finally, we analyzed 161 patients. Univariate and multivariate Cox regression analyses were performed to identify factors affecting 1-year mortality. Patient-side factors such as age, BMI, fracture type, and preoperative mobility, and surgical factors such as surgical procedure, time to surgery, and operation time were analyzed respectively. RESULTS: Eighteen of 161 patients (11.2%) died one year after surgery. The multivariate Cox regression analysis identified older age, wheelchair status before injury, and operation time as independent predictors of 1-year mortality (older age: hazard ratio [HR] 1.07, 95% CI 1.01-1.15, P = 0.048; wheelchair status: HR 5.82, 95% CI 1.01-33.47, P = 0.049; operation time: [HR] 1.01, 95% CI 1.00-1.01, P = 0.00929). Meanwhile, fracture type according to the Vancouver classification, body mass index, presence of previous fragility fractures, type of ﬁxation, blood loss during operation, and time to surgery were not independent predictors of 1-year mortality in this analysis. ConclusionThe 1-year mortality rate after surgery for PPFs patients was 11.2%. Factors associated with older and poor activity of daily living (ADL) performance (e.g., wheelchair status before injury), and longer operative time were associated with 1-year mortality after surgery for PPF. Surgeons should carefully plan treatment according to each patient's condition.

DOI： 10.1016/j.jos.2022.12.015

Home exercises after volar locking plate fixation for distal radius fracture in the elderly are as effective as supervised physiotherapy -multicenter retrospective study- Reviewed

Yuma Saito, Yasuhiko Takegami, Katsuhiro Tokutake, Ryutaro Shibata, Hiroyuki Matsubara, Shiro Imamaga

Journal of Orthopaedic Science Vol. 29 ( 1 ) page： 146 - 150 2024.1

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Background: Although home exercises are used for postoperative rehabilitation of distal radius fractures (DRF), the superiority of home exercise over supervised physiotherapy rehabilitation is controversial. This study aimed to compare the function of home exercise and supervised physiotherapy rehabilitation during postoperative rehabilitation for DRF. Methods: We conducted a multicenter, retrospective study in which we included 1949 patients over 65 years old who underwent volar locking plate fixation for DRF. After propensity score matching, 308 patients were assigned to each of an independent home exercise group (IHG) and supervised physiotherapy group (SPG). Wrist function was assessed after 3, 6, and 12 months postoperatively. Results: The results showed that the Mayo Wrist Score did not differ significantly within the observation period. Range of motion of the wrist was better in the SPG up to 3 months postoperatively but was almost the same as that in the IHG at 6 months. However, the Numerical Rating Scale score was lower in the IHG during all observation periods. Conclusions: Home exercise may be as effective as supervised physiotherapy in the medium term, but supervised physiotherapy rehabilitation should be considered if early recovery and good wrist function are desired.

DOI： 10.1016/j.jos.2022.11.017

An age-matched comparative study on intramedullary nailing and plate fixation of both-bone diaphyseal forearm fracture in adolescents. Reviewed International journal

Noriko Ishihara, Katsuhiro Tokutake, Yasuhiko Takegami, Yuta Asami, Hiroaki Kumagai, Hideyuki Ota, Yoshihiko Kimura, Kazuma Ohshima, Shiro Imagama

European journal of orthopaedic surgery & traumatology : orthopedie traumatologie Vol. 34 ( 1 ) page： 441 - 450 2024.1

Language：English Publishing type：Research paper (scientific journal)

OBJECTIVE: This study aimed to compare radiological and functional outcomes and complication rates between intramedullary nailing (IMN) and plate fixation for diaphyseal forearm fractures in adolescents via an age-matched analysis. METHODS: Data were collected from medical records at 11 hospitals from 2009 to 2019, and the age-matched study was conducted between IMN and plate fixation. Functional outcomes, radiographic outcomes, and postoperative complication rates were compared. RESULTS: The IMN group (Group N) and plate fixation group (Group P) each comprised 26 patients after age matching. The mean age after matching was 13.42 years old. Bone maturities at the wrist of the radius and ulna were not significantly different between the two groups (p = 0.764 and p = 1). At the last follow-up period, functional outcomes using the Price criteria were over 90% in both groups, and the rotational range of motion was comparable to that of the healthy side. Over 70% of cases in Group N were performed by closed reduction, and operation time was half that of Group P. Postoperative neurological symptoms and refractures were more common in Group P than in Group N, although not statistically significantly so. CONCLUSIONS: Treatment outcomes for age-matched adolescent diaphyseal forearm fractures were excellent with IMN, as well as with plate fixation in many cases despite fewer complications, better cosmesis, and shorter operative times with IMN. IMN for diaphyseal forearm fractures is a useful treatment option even in adolescents although the indications for the best procedure to perform should be considered depending on individual patient needs. LEVEL OF EVIDENCE IV: Multicenter retrospective study.

DOI： 10.1007/s00590-023-03679-8

Fall risk in patient with dysplastic hip osteoarthritis. Reviewed International journal

Takamune Asamoto, Yusuke Osawa, Yasuhiko Takegami, Masanori Okamoto, Hiroki Iida, Shiro Imagama

International orthopaedics Vol. 48 ( 1 ) page： 221 - 227 2024.1

Language：English Publishing type：Research paper (scientific journal)

PURPOSE: Patients with dysplastic hip osteo arthritis (DHOA) often have a spinopelvic imbalance, and they are more likely to experience falls. This study aimed to evaluate the risk factors for falls in patients with DHOA, including spinopelvic parameters. METHODS: In this cross-sectional study, a total of 103 patients with DHOA were included from 2019 to 2021. Fall risk was evaluated using the Fall Risk Index 5 items version (FRI-5). Demographics, functional outcomes, and spinopelvic parameters were compared between the high-risk group (FRI-5 ≥ 6) and the low-risk group (FRI-5 < 6). Multivariate analysis was performed using factors with significant differences in univariate analysis. RESULTS: High-risk and low-risk groups comprised 54 and 49 patients, respectively. Females were significantly more common in the high-risk group than in the low-risk group. The Harris Hip Score was significantly lower in the high-risk group than in the low-risk group (p = 0.02). Pelvic incidence, tilt, and obliquity were significantly higher in the high-risk group than in the low-risk group (p < 0.01). In multivariate analysis, female sex (odds ratio [OR]: 3.76, 95% confidence interval [CI]: 1.11-12.64, p = 0.03), pelvic obliquity (OR: 1.36, 95% CI: 1.09-1.71, p < 0.01), and Harris hip score (OR: 0.96, 95% CI: 0.93-0.99, p = 0.02) were identified as risk factors. CONCLUSION: Female sex, pelvic obliquity, and low Harris hip score were associated with an increased risk of falls among patients with DHOA.

DOI： 10.1007/s00264-023-05938-z

Locked Tension Band Wiring: A Modified Technique for Olecranon Fractures-A Multicenter Study Comparing Clinical Outcomes and Complications with Conventional Methods. Reviewed International journal

Yutaro Kuwahara, Yasuhiko Takegami, So Mitsuya, Katsuhiro Tokutake, Kenichi Yamauchi, Shiro Imagama

Indian journal of orthopaedics Vol. 57 ( 12 ) page： 2024 - 2030 2023.12

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

PURPOSE: Tension band wiring is the standard treatment for olecranon fractures, but it is associated with high rate of implant-related complication. To reduce this high complication rate, we developed a modified technique, locked tension band wiring (LTBW). The aim of this study was to investigate whether LTBW reduces complication and reoperation rates compared to conventional methods (CTBW). METHODS: We identified 213 olecranon fractures treated with tension band wiring: 183 were treated with CTBW, and 30 were treated with LTBW, and patients in each group were selected using propensity score matching. We evaluated operation time, intraoperative bleeding, complication and reoperation rates, the amount of Kirschner's wire (K-wire) back-out, and Mayo Elbow Performance Index (MEPI). Complications included nonunion, loss of fracture reduction, implant failure, infection, neurological impairment, heterotopic ossification, and implant irritation. Implant removal included at the patient's request with no symptoms. RESULTS: We finally investigated 29 patients in both groups. The mean operation time was significantly longer in the LTBW (106.7 ± 17.5 vs. 79.7 ± 21.1 min; p < 0.01). Complication rates were significantly lower in the LTBW than the CTBW group (10.3 vs. 37.9%; p = 0.03). The rate of implant irritation was more frequent in the CTBW, but there was no significant difference (3.4 vs. 20.7%; p = 0.10). Removal rate was significantly lower in the LTBW (41.4 vs. 72.4%; p = 0.03). The mean amount of K-wire backout at last follow-up was significantly less in the LTBW (3.79 ± 0.65 mm vs. 8.97 ± 3.54 mm; p < 0.01). There were no significant differences in mean MEPI at all follow-up periods (77.4 ± 9.0 vs. 71.5 ± 14.0; p = 0.07, 87.4 ± 7.2 vs. 85.2 ± 10.3; p = 0.40, 94.6 ± 5.8 vs. 90.4 ± 9.0; p = 0.06, respectively). CONCLUSION: Our modified TBW significantly increased operation time compared to conventional method, but reduced the complication and removal rate and had equivalent functional outcomes in this retrospective study.

DOI： 10.1007/s43465-023-01017-y

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