[Magnetic resonance imaging (MRI) of avascular necrosis of the femoral head].
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Adult↗
Biomedical subjects
Y Takatori
Publications and source records attributed to Y Takatori.
Magnetic resonance imaging and histopathology in femoral head necrosis.
We correlated preoperative magnetic resonance (MR) images and histopathology of eight femoral heads from patients with osteonecrosis. The signal intensity of the MR image was low in the area where fibrovascular tissue, disintegrated fibrovascular tissue, or amorphous necrotic material occupied the medullary space. On the other hand, the necrotic marrow without revascularization showed high signal intensity. Osteonecrosis can be detected by MR imaging as soon as a certain amount of bone marrow is replaced by fibrovascular tissue.
Adult↗
[Subcutaneous operation and examination under the universal endoscope].
Endoscopes are mainly used to study the internal structures of organs and tissues with inherent space. These include the gastrointestinal tract, abdominal space and joint space. The standard endoscope, however, cannot be used to evaluate tissues without such space. We have invented a new type of operation tube to be used with the arthroscope. This combination enables us to study subcutaneous soft tissues without inherent space. Our new device is a powerful tool to be used for evaluation of subcutaneous soft tissues in any part of the body. Surgical procedures can also be carried out with this device. Areas of future applications of our device will be extremely wide including orthopaedic surgery, plastic surgery and general surgery. The presentation will discuss the procedure for utilizing this new instrument.
Adult↗
Peritoneoscopy as an aid in intravenous injection of indocyanine green (ICG).
Peritoneoscopy as an aid in intravenous injection of indocyanine green (ICG) was clinically evaluated. Hepatic parenchyma was stained after intravenous injection of ICG, while interstitial connective tissue, fatty deposition and hepatoma tissue were not. Regenerative hepatic cell mass including dark reddish patchy marking (Shimada's code No. 7) and semispherical areas of regeneration or nodules (Shimada's code No. 8) was well stained and clearly contrasted. There were some cases of chronic active hepatitis, in which liver surface showed spotty staining at sites expected to become regenerative nodules in the future, in contrast to being judged as "no abnormal findings" peritoneoscopically. On the other hand, periportal reddish marking (Shimada's code No. 4) representing piecemeal or bridging hepatic cell necrosis was not stained.
Carcinoma, Hepatocellular↗
Orthotic management of severe genu varum and tibia vara.
In two cases of severe genu varum and one case of infantile tibia vara, we employed double-upright knee-ankle-foot orthoses with free knee and ankle joints. The patients tolerated these orthoses well and were able to walk. The results were satisfactory.
Ankle Joint↗
MR demonstration of intraosseous beta-2-microglobulin amyloidosis.
We present a case of intraosseous beta-2-microglobulin amyloidosis of a patient receiving long-term hemodialysis. Magnetic resonance imaging clearly demonstrated intraosseous amyloid deposits as hypointense masses in the femoral head.
Aged↗
Fat intensity within the hypointense zone on MR imaging of avascular necrosis of the femoral head.
In some patients with avascular necrosis of the femoral head (ANFH), an area of signal intensity similar to that of subcutaneous fat tissue is found within or proximal to the hypointense zone of spin echo MR images. We refer to these MR findings as the "fat intensity" sign. This fat intensity sign was positive in 62 (47%) of 133 MR examinations of femoral heads with radiographically proven ANFH; this sign was negative in all hips with other diseases including degenerative joint disease, transient osteoporosis, rapidly destructive coxoarthrosis, and rheumatoid arthritis.
Adipose Tissue↗
Lateral longitudinal stress fracture of the patella: report of three cases.
Stress fracture of the patella is a rare occurrence. Two types, longitudinal and transverse, are known. We report three lateral longitudinal fractures of the patella caused by running, Japanese fencing, and long distance walking. Patients returned to physical activities after 2-3 months of conservative treatment.
Athletic Injuries↗