Publications by authors named "Nagakazu Shimada"

Article Synopsis
  • Orthotic treatment is commonly used for osteoporotic vertebral fractures (OVF), but there's limited evidence on its effectiveness, leading to this study investigating its clinical benefits.
  • The research involved a retrospective cohort study of 160 patients with fresh OVF, comparing outcomes between those who wore braces and those who did not, measuring factors like pain levels and vertebral height over time.
  • The results showed no significant improvement in pain or vertebral height between the brace and no-brace groups; however, the angular change in fractured vertebrae was notably less in patients using braces, particularly rigid braces, suggesting some benefits in fracture stability.
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Objectives: It is unclear whether improvements in knee pain or physical function lead to improvements in activities of daily living (ADL) and quality of life (QOL) in patients with moderate to severe knee osteoarthritis (KOA). This study aimed to investigate whether improvements in knee pain and physical function, achieved through exercise therapy, lead to improvements in ADL and QOL in patients with moderate to severe KOA.

Methods: This case-control study included 18 patients with KOA.

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To determine whether the mechanical properties of joint soft tissues such as cartilage can be calculated from quantitative magnetic resonance imaging (MRI) data, we investigated whether the mechanical properties of articular cartilage and meniscus scheduled to be resected during arthroplasty are correlated with the T2 relaxation time on quantitative MRI at the same location. Six patients who had undergone knee arthroplasty and seven who had undergone hip arthroplasty were examined. For the knee joint, the articular cartilage and lateral meniscus of the distal lateral condyle of the femur and proximal lateral tibia were examined, while for the hip joint, the articular cartilage above the femoral head was studied.

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Study Design: Prospective cohort study.

Objective: To identify the effects of multidisciplinary approaches (MAs) to improve social functioning (SF) on 1-year surgical outcomes in patients with cervical myelopathy.

Summary Of Background Data: Despite significant improvement in cervical myelopathy, a patient's quality of life (QOL) sometimes does not improve postoperatively.

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Purpose: Although several factors related to the concomitant meniscal injury at anterior cruciate ligament reconstruction (ACL-R) have been investigated in a general population, few studies have identified the risk factors of meniscal tear severity in young patients in which the majority of ACL tears occur. The purpose of this study was to analyze the associated factors with meniscal injury and irreparable meniscal tear and the timeline for medial meniscal injury at ACL-R in young patients.

Methods: A retrospective analysis of young patients (13 to 29 years of age) who underwent ACL-R by a single surgeon from 2005 to 2017 was conducted.

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No reports have previously evaluated the association between surgical technique and the incidence of postoperative spinal epidural hematoma (PSEH) following microendoscopic decompression surgery (MED). This study aimed to evaluate the association between the development of radiographic PSEH (rPSEH) following MED and microendoscopic surgical experience and postoperative clinical outcomes related to the quality of life (QoL). This retrospective cohort study included 3922 patients who had undergone MED performed by a single surgeon.

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Patient satisfaction is crucial in pay-for-performance initiatives. To achieve further improvement in satisfaction, modifiable factors should be identified according to the surgery type. Using a prospective cohort, we compared the overall treatment satisfaction after microendoscopic lumbar decompression between patients treated postoperatively with a conventional physical therapy (PT) program (control; n = 100) and those treated with a PT program focused on low back pain (LBP) improvement (test; n = 100).

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Backgrounds: The current prolonging state of the coronavirus disease (COVID-19), could affect many aspects of people's lives, especially the elderly population who experience a decrease in regular exercise. However, whether this decrease in regular exercise affects health-related quality of life (HRQOL) of the elderly population, remains unclear.

Methods: The current population-based cross-sectional survey aimed to identify the relationship between the decrease in regular exercise since the COVID-19 pandemic and any changes in the HRQOL in the general elderly Japanese population.

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Background: Restrictions during the coronavirus disease 2019 (COVID-19) pandemic have decreased physical activity levels, which may result in locomotive syndrome. This study evaluated the change in locomotive syndrome prevalence and associated risk factors among an elderly population before and after a coronavirus outbreak.

Methods: This written self-administered cross-sectional survey was conducted in conjunction with the coronavirus disease vaccination program in Habikino City, Japan.

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Parrot beak tear is a white-white meniscal injury that often occurs in isolated injuries. Partial meniscectomy for parrot beak tears is often recommended, owing to the avascular zone; however, partial meniscectomy, especially with the lateral meniscus, has a high failure rate for return to sports, leading to residual meniscus extrusion and lateral compartment osteoarthritis. Thus, we have developed a repair technique to preserve the parrot beak tear of the avascular zone.

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Article Synopsis
  • Percutaneous laser disc decompression (PLDD) has a 4-5% recurrence rate for lumbar disc herniation (LDH), leading to this study comparing outcomes of microendoscopic discectomy (MED) in patients with prior PLDD versus those without.
  • The research analyzed 2678 MED patients, focusing on a matched group of 42 with previous PLDD, revealing no significant differences in disc degeneration severity or clinical outcomes post-surgery.
  • While the PLDD group exhibited more frequent Modic changes, the history of PLDD did not adversely affect the clinical results of subsequent MED, suggesting that previous PLDD does not hinder recovery.
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Background: Few studies have attempted to identify risk factors associated with irreparable meniscal tears at anterior cruciate ligament reconstruction (ACLR) and to describe follow-up data, such as the failure rate, after meniscal repair.

Purpose: To investigate the associations of age, sex, body mass index (BMI), time to surgery (TTS), and preinjury Tegner score with the presence of meniscal injuries and irreparable meniscal tears at primary ACLR.

Study Design: Cross-sectional study; Level of evidence, 3.

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Objective: Although minimally invasive endoscopic surgery techniques are established standard treatment choices for various degenerative conditions of the lumbar spine, the surgical indications of such techniques for specific cases, such as segments with ossification of the ligamentum flavum (OLF) or calcification of the ligamentum flavum (CLF), remain under investigation. Therefore, the authors aimed to demonstrate the short-term outcomes of minimally invasive endoscopic surgery in patients with degenerative lumbar disease with CLF or OLF.

Methods: This is a retrospective cohort study including consecutive patients who underwent microendoscopic posterior decompression at the authors' institution, where the presence of OLF and CLF did not influence the surgical indication.

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Purpose: The purpose was to assess the incidence of postoperative osteochondritis dissecans (OCD) and the related epidemiologic factors following meniscal surgery for juvenile discoid lateral meniscus (DLM).

Methods: The study was a retrospective review of 103 knees in 89 patients with a mean age of 12.1 years who underwent arthroscopic meniscal surgery for DLM.

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We evaluated the abnormal displacement of a complete discoid lateral meniscus in two patients with symptoms of a large popping sound during knee flexion and extension, so-called "snapping", and no displacement of the discoid meniscus on routine Magnetic Resonance Imaging (MRI) analysis. MRI images indicated an anterocentral shift of the lateral discoid meniscus on knee deep flexion in one case and a posterocentral shift of the meniscus on knee full extension in the other case. Abnormal meniscal instability was confirmed under arthroscopy in both knees.

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Article Synopsis
  • Osteochondral autograft transplantation (OAT) is used to treat capitellar osteochondritis dissecans (OCD) in juvenile athletes, but the impact of donor site morbidity (DSM) from harvesting tissue is not well understood.
  • A study of 86 athletes showed that while some experienced DSM, overall clinical outcomes were positive, with all patients able to return to their competitive sports and a high mean knee score of 99.0.
  • Radiographic assessments indicated that abnormal findings were present in 35% of patients, with better outcomes in those without DSM, highlighting the need to consider donor site health in future evaluations.
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Purpose: To investigate the prevalence of cyst formation after using all-inside meniscal repair device and analysed the risk factors associated with it.

Methods: Between August 2008 and September 2013, 51 menisci of 46 patients were included in the study, 46 menisci of which had concomitant anterior cruciate ligament (ACL) ruptures and had an ACL reconstruction. Magnetic resonance imaging (MRI) of the knee was performed at 3, 6, 12 and 24 months after meniscal surgery.

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Purpose: The purpose of this study was to compare femoral graft bending angle between patients with femoral tunnel reamed at less than 80° of knee flexion and those with 80° and above in anatomical anterior cruciate ligament (ACL) reconstruction using modified transtibial technique.

Methods: Forty-eight patients who underwent ACL reconstruction using bone-patellar-tendon-bone autograft in modified transtibial technique and CT scan at 1 week postoperatively were included in this study. A femoral guidewire insertion into aimed femoral position at the medial wall of the femoral lateral condyle was started at about 75° of knee flexion.

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Article Synopsis
  • Clinical studies show that osteochondral autograft transplantation (OAT) works well for central lesions of unstable osteochondritis dissecans (OCD) in the elbow, but results for lateral lesions are less clear.
  • Researchers analyzed 87 juvenile athletes who underwent OAT, comparing outcomes between those with central (43 patients) and lateral (44 patients) lesions over an average follow-up of about 43 months.
  • Findings suggested that central lesions had better overall outcomes, including range of motion and lower rates of complications like postoperative radial head subluxation and osteoarthritis, compared to lateral lesions.
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Purpose: The purpose of this study is to assess the results of revision anterior cruciate ligament (ACL) reconstruction after the failure of primary ACL double bundle reconstruction (ACL-DBR).

Methods: Twenty-two knees in 22 patients (group R) that underwent ACL revision surgery using bone-patellar tendon-bone (BTB) autograft after the failure of primary ACL-DBR were included in this study. Intraoperative findings and postoperative knee laxity and clinical outcomes in group R were assessed.

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Article Synopsis
  • The study investigates the impact of femoral tunnel location and drilling techniques on graft bending angle in ACL double bundle reconstruction (ACL-DBR).
  • Two techniques were used: outside-in (26 patients) and transportal (25 patients), with CT scans taken a week after surgery to measure tunnel positions and graft angles.
  • Results show that the outside-in technique resulted in a more anterior and proximal femoral tunnel exit, leading to a greater bending angle for the anteromedial bundle (AMB) compared to the transportal technique.
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Article Synopsis
  • * A total of 55 patients were examined, divided into two groups based on their drilling technique: outside-in (Group A) and transportal (Group B), with CT scans taken at 1 week and 6 months post-surgery.
  • * Results showed no significant difference in the rate of post-operative femoral tunnel communication between the two groups, though the mean distance of the bone bridge was greater in those without communication compared to those with.
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Background: For peroneal tendon dislocation, various surgical procedures have been described. Das De et al. reported good clinical results using retinaculum repair.

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Osteochondritis dissecans (OCD) of the lateral femoral condyle sometimes occurs with a discoid lateral meniscus. Recently, it was reported that OCD of the lateral femoral condyle occurred after total removal of the lateral meniscus. We report the case of a 12-year-old boy with bilateral OCD of the lateral femoral condyle following bilateral total removal for discoid lateral meniscus.

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Aim: To investigate the factors in the progression of renal failure in type 2 diabetes in elderly people.

Materials And Methods: The subjects were 2034 patients hospitalized for type 2 diabetes therapy at Osaka City University Hospital from 1993 to 2000. Among them, 362 patients had diabetic non-dialyzed renal failure.

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