Biomedical subjects

Y Ohneda

Publications and source records attributed to Y Ohneda.

3 recordsLinked to original sources

PubMed1995

[Triple osteotomy (modified Tönnis method) for advanced coxarthrosis].

The results of 79 triple osteotomies (modified Tönnis method) for advanced coxarthrosis in 76 patients, performed between 1986 and 1991 in our clinic, were evaluated. The operation was performed for 72 females and 4 males, with a mean age of 45.6 years, ranging from 20 to 59 years. The mean follow-up period was 4 years and 2 months, ranging from 1.6 to 9 years. The operative technique used was a modified Tönnis method originally described by Tönnis in 1981. Using a dorsal approach, the ischium is first osteotomized and then turning the patient to the supine position, the osteotomies of the pubis and ilium are performed through an anterior approach. The osteotomized acetabulum is rotated antero-laterally as much as possible to cover the femoral head sufficiently and is fixed with 4 or 5 Steinmann pins. For the clinical evaluation, we used the Japanese Orthopaedic Association Hip Score. The average score improved from 68 points preoperatively to 90 points postoperatively. The roentogenological evaluation confirmed the following results; excellent in 36 hips (46%) with good joint space and good joint congruity, fair in 35 hips (44%) with good joint space and fair joint congruity, and poor in 8 hips (10%) with narrowed joint space. The average CE angle at follow-up was 40.3 degrees in 36 hips with excellent result, 33.8 degrees in 35 hips with fair, and 32.4 degrees in 8 hips with poor (p < 0.01). Good remodelings are obtained, if the CE angle becomes more than 40 degrees postoperatively in acetabular rotational osteotomy for advanced coxarthrosis.

Adult↗

PubMed1992

[Assessment of limp in patients with coxarthrosis--three-dimensional measurement of the pelvic rotation].

To assess the gait characteristics of the patients with coxarthrosis objectively, the rotation of the pelvis during ambulation was measured on the frontal, sagittal and horizontal planes using 3 gas-rate-sensors(Rotational Angle Measurement System G-2210, Anima Inc., Tokyo). In the normal subjects, the waveforms of the rotational angle on the frontal plane were symmetrical, highly reproducible and had 2 peaks. In contrast, the waveforms of the patients were asymmetrical and poorly reproducible. This was shown objectively using Fourier transform technique. The mean rotational angle of the patients was smaller than that of the normal subjects on the frontal plane, and larger on the sagittal plane. We can distinguish the patients from the normal subjects by observation of the waveform on the frontal plane and the ratio of the rotational angle on the sagittal plane to that on the frontal plane.

Adult↗

PubMed1992

[A histopathological study on the femoral head necrosis in spontaneously hypertensive rats (SHR)].

The histopathological study was conducted in the femoral head of spontaneously hypertensive rats (SHR), which had frequently manifested osteonecrosis and a delay in the ossification at the femoral epiphysis. In order to elucidate the course of necrosis and its repair process, the bone dynamic of the femoral head was investigated with bone fluorochrome labelling technique. Femoral epiphyses in the SHR were classified into five groups, according to their histopathological changes in relation to osteonecrosis, its repair process and the delay in ossification. Changes in the growing rate of the growth plate at the femoral head and neck were measured quantitatively. As a result, the articular cartilage remained viable and overgrowing, while the epiphyseal plates were affected by the necrosis and there was early physeal maturation occurred. It is concluded that SHR appear to be a useful experimental model for Perthes' disease.

Animals↗