Publications by authors named "Kazufumi Yamamoto"

Purpose: Monthly regimen of minodronate for osteoporosis more than two years has not been reported yet. The aim of this study is to elucidate the effect of monthly minodronate (M-MIN) on bone mineral density (BMD) and serum pentosidine (Pen) during 27 months.

Materials And Methods: The study consisted of 52 newly treated patients (73.

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Background: Elderly patients with hip fracture are at risk for cardiac complications. N-terminal pro-brain type natriuretic peptide (NT-proBNP) has been shown to predict cardiac complications in surgical patients; however, to our knowledge, only two studies have evaluated the utility of this test in patients with hip fracture. We believe it is important to assess a more accurate cutoff value of NT-proBNP with exclusion of patients with renal failure.

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The incidence of second hip fractures occurring within a year of initial fractures is 20%-45%. The high incidence of second hip fractures in this period can be attributed to the rapid bone loss that occurs during this time. Restoring bone mass at an early stage after hip fractures is critical for preventing subsequent fractures.

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Objective: The aim of the present study was to investigate the efficacy of arthroscopic enlargement of unidirectional valvular slits for the treatment of popliteal cysts and to evaluate potential factors affecting the outcomes of our arthroscopic procedure.

Methods: Twenty-nine patients aged 43-77 years with popliteal cysts were treated with arthroscopic cyst decompression. Surgery was performed via two posterior portals after creating a transseptal portal.

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Arthroscopic debridement of the posterior compartment of the knee after total knee arthroplasty is difficult because it is tough to obtain intercondylar notch views. Herein, we performed arthroscopic debridement of the posterior compartment of an infected knee after total knee arthroplasty by using a transseptal portal in a 62-year-old woman with rheumatoid arthritis. Palpation of anatomical landmarks and posterior capsule protection are important for safe creation of a transseptal portal following to making 2 posterior portals.

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Snapping phenomenon around the medial aspect of the knee is rare. We present this case of snapping knee caused by the sartorius muscle over a large medial meniscal cyst in a 66-year-old female. Magnetic resonance images demonstrated a large medial meniscal cyst with a horizontal tear of the medial meniscus.

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Background: To evaluate medial extrusion of the posterior segment of the medial meniscus in posterior horn tears.

Methods: This study enrolled 72 patients without medial meniscal tears (group N), 72 patients with medial meniscal tears without posterior horn tears (group PH-), 44 patients with posterior horn tears of the medial meniscus (group PH+). All meniscal tears were confirmed by arthroscopy.

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We present this case of a meniscal ossicle of the posterior horn of the medial meniscus that was treated by an arthroscopic ossicle resection followed by a pullout repair of the remaining meniscus. A 49-year-old businessman complained of catching and left knee pain. Radiographic and arthroscopic findings revealed a meniscal ossicle embedded in the posterior horn of the medial meniscus and posterior horn tear.

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Velocity of ultrasound waves has proved to be a useful indicator of bone biomechanical competence. A detailed understanding of the dependence of ultrasound parameters such as velocity on bone characteristics is a key to the development of bone quantitative ultrasound (QUS). The objective of this study is to investigate the relative contributions of porosity and mineralized matrix properties to the bulk compressional wave velocity (BCV) along the long bone axis.

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Quantitative ultrasound (QUS) is now widely used for evaluating bone in vivo, because obtained ultrasonic wave properties directly reflect the visco-elasticity. Bone tissue is composed of minerals like hydroxyapatite (HAp) and a collagen matrix. HAp crystallites orientation is thus one parameter of bone elasticity.

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Osteochondroma is usually located outside of the joint and is asymptomatic. We have witnessed the symptoms of intra-articular osteochondroma of the knee joint and resected it arthroscopically. A 54-year-old woman with multiple osteochondromatosis presented with pain and a click on the right knee.

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