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Biomedical subjects

Y Takatori

Publications and source records attributed to Y Takatori.

At least 37 records · Page 2Linked to original sources
PubMed1993

Polylactide screws in acetabular osteotomy. 28 dysplastic hips followed for 1 year.

Absorbable polylactide screws were used for internal fixation of rotational acetabular osteotomy (RAO) in 28 dysplastic hips. No cast was used and the patients were allowed to walk with partial weight bearing 1 month after surgery. Clinical and radiographic results were evaluated after 14 (6-24) months. Union occurred in all cases within 4 months without displacement of the osteotomy. No foreign-body inflammatory reaction on radiographs was observed, nor were there any local reactions, such as redness or swelling. Polylactide screws seem to provide sufficient strength for the internal fixation of RAO. Further observation is necessary to identify any late foreign body reaction.

Acetabulum↗
PubMed1993

Results of endoscopic management of carpal-tunnel syndrome in long-term haemodialysis versus idiopathic patients.

The purpose of this paper is to compare the results of our endoscopic management of carpal-tunnel syndrome caused by long-term haemodialysis to that with no apparent cause (idiopathic). We have operated on 551 hands in 370 patients using the Universal Subcutaneous Endoscope system under local anaesthesia without a pneumatic tourniquet on an out-patient basis since 1986. Ninety-six hands in 64 patients who suffered from carpal-tunnel syndrome from long-term haemodialysis and 85 hands in 52 patients who suffered from carpal-tunnel syndrome for no apparent cause were statistically analysed using complete pre- and postoperative electrophysiological and clinical studies for periods of time ranging from over 6 months to 4.8 years (mean 16.9 months). Electrophysiological and clinical results showed that our endoscopic management in long-term haemodialysis patients is effective, safe and yields the same results as in patients who suffered from carpal-tunnel syndrome for no apparent cause.

Adult↗
PubMed1993

Results of endoscopic management of carpal tunnel syndrome.

This paper is a retrospective study of 27 women with carpal tunnel syndrome (39 hands) who underwent a new endoscopic operative procedure utilizing the Universal Subcutaneous Endoscope system developed by the lead author. Operations on 199 hands were performed under local anesthesia on an outpatient basis. The etiology was considered idiopathic in all cases. Complete preoperative and postoperative clinical and electrophysiologic data were analyzed in 39 hands. The follow-up period ranged from 12 to 45.8 months (mean, 18.3 months). Symptoms of sensory disturbances disappeared in an average of 20 weeks in all patients. Electrophysiologic studies showed definite improvement when compared with preoperative studies. No complications were recorded. Clinical and electrophysiologic results showed that the less-invasive management of carpal tunnel syndrome by endoscopy is safe and effective.

Ambulatory Surgical Procedures↗
PubMed1992

Coracoacromial ligament release for shoulder impingement syndrome using the Universal Subcutaneous Endoscope system.

We developed a new operative procedure of coracoacromial ligament release for shoulder impingement syndrome. The operative procedure was confirmed by cadaveric studies and applied to clinical cases in 40 shoulders of 37 patients who suffered from shoulder impingement without bony abnormalities. The subacromial space was observed under local anesthesia using the Universal Subcutaneous Endoscope (USE) system on an outpatient basis. A popping phenomenon was observed between the coracoacromial ligament and the greater tuberosity of the humerus, which was covered by the rotator cuff, and the coracoacromial ligament was resected with a rongeur under endoscopic visualization in all shoulders. Resection of the coracoacromial ligament relieved the impingement and clinical signs, as in open or arthroscopic resection of the coracoacromial ligament. Resection of the coracoacromial ligament using the USE system is a safe and less-stressful surgical invasion than open or standard arthroscopic resection of the coracoacromial ligament.

Anesthesia, Local↗
PubMed1992

Magnetic resonance imaging and scintigraphy of avascular necrosis of the femoral head. Prediction of subsequent segmental collapse.

For the purpose of an effective management of patients at high risk for nontraumatic avascular necrosis of the femoral head (ANFH), it is expedient to examine the femoral heads of patients most likely to undergo subsequent segmental collapse. The purpose of this study was to evaluate the ability of magnetic resonance imaging (MRI) and radionuclide bone scanning (RS) to predict segmental collapse of the femoral head at the roentgenographically normal stage. Fifty-five hips in 37 patients at risk for ANFH and having normal roentgenograms were included in this study. Magnetic resonance imaging was performed in all hips and RS in 29 hips. The patients were observed during a period of more than two years without any invasive intervention, and nine femoral heads manifested collapse during this period. Predictive values for subsequent segmental collapse of a positive test of MRI and RS were 31% and 13%, respectively, whereas those indicative of a negative test were 100% and 76%, respectively. Magnetic resonance imaging was more useful than RS in detecting patients in need of intensive follow-up examination. In particular, a bandlike area of low intensity that traversed the femoral head in midcoronal slices on MR images seemed to be a significant indicator of subsequent collapse.

Adult↗
PubMed1991

Endoscopic management of shoulder pain in long-term haemodialysis patients.

In 48 shoulders of 29 patients receiving long-term haemodialysis and complaining of intolerable shoulder pain, endoscopic resection of the coracoacromial ligament was performed under local anaesthesia on an outpatient basis, using the Universal Subcutaneous Endoscope system. Predominant endoscopic findings were proliferation of the subacromial bursae and popping between the coracoacromial ligament and the rotator cuff. Amyloid originating from beta 2 microglobulin (beta 2-M) was demonstrated in 87% of the resected coracoacromial ligaments and 86% of the subacromial bursae. Resection of the coracoacromial ligament relieved the shoulder pain in all patients.

Adult↗
PubMed1991

Retinal vasculitis in a mother and her son with human T-lymphotropic virus type 1 associated myelopathy.

A 53-year-old woman had difficulty in walking, raised titres to human T-lymphotropic virus type 1 (HTLV-1) in serum and cerebrospinal fluid, and yellowish white retinal lesions and vasculitis in the right eye. Her 20-year-old son also had difficulty in walking, raised titres to HTLV-1 in serum and cerebrospinal fluid, and retinal vasculitis and multiple whitish vitreoretinal spots in both eyes.

Adult↗
PubMed1991

Transient osteoporosis of the hip. Magnetic resonance imaging.

Magnetic resonance (MR) images of seven hips were reviewed in six patients with transient osteoporosis of the hip. The MR images of the affected joint showed increased joint fluid and diffuse signal abnormalities in the marrow of the femoral head, corresponding to a decreased signal intensity on T1-weighted images and an increased signal intensity on T2-weighted images. The MR images at the time of clinical improvement showed regression of the abnormalities. These MR abnormalities reflect the pathophysiology of this condition.

Acute Disease↗
PubMed1991

[Correlation between the findings of magnetic resonance imaging and prognosis of patients with predisposing factors of aseptic necrosis of the femoral head].

Eighteen patients with the predisposing factors for aseptic necrosis of the femoral head were followed up for more than two years after the initial magnetic resonance (MR) imaging. At the time of the initial examination, 24 femoral heads showed abnormal low-intensity areas on MR images without abnormal findings on plain radiographs. Among them, six femoral heads collapsed in the follow-up period. The initial mid-coronal T1-weighted MR images of these femoral heads had shown characteristic findings, that is, band-shaped low-intensity areas with the lateral end not covered by the acetabulum. Subchondral fracture of the femoral head occurred in the vicinity of the lateral end of the band. The findings of initial MR imaging seem to predict subsequent collapse of the femoral head.

Adult↗
PubMed1990

[Avascular necrosis of the femoral head: chronological change of MR images].

Tl-weighted MR images of thirty-six hips in 25 patients with avascular necrosis of the femoral head were obtained two to five times during the course of 2 to 26 months. We investigated these MR images in the light of the chronological change and compared them with plain radiographs. MR images change in 16 femoral heads; in general, the abnormal low intensity area in the femoral head reduced in extent and the internal high intensity area became smaller of disappeared. Thirteen femoral heads among them became more flattened on plain radiographs in the same period. It is noted that four different zones are defined in the femoral head after bone necrosis takes place: the dead bone marrow, the dead marrow which still contains fat, the reactive interface and the hyperemic bone marrow. In Tl-weighted MR images, the dead bone marrow, the reactive interface and the hyperemic bone marrow are demonstrated as low intensity area, while the dead marrow containing fat may remain high in intensity. On the basis of this knowledge of histopathology and MR images of this disease, we suggest that reduction of the abnormal low intensity area and disappearance of the internal high intensity area on MR images can be regarded as diminution of hyperemia in the living bone marrow and loss of fat in the dead bone marrow, respectively.

Adult↗
PubMed1990

[Difference between T1 and T2 weighted MR images in avascular necrosis of the femoral head].

T1 and T2 weighted MR images were compared in 32 hips with avascular necrosis, and the difference between them was discussed. In 27 of 32 hips, abnormal low intensity area in the affected femoral head is smaller in T2 weighted images than in T1 weighted images. The area of low intensity on T1 weighted image and high on T2 weighted image might be granuloma in reactive tissue and surrounding hyperemia. The difference between T1 and T2 weighted images must be taken into consideration especially in determination of the border of affected bone.

Adult↗
PubMed1990

[MR imaging of idiopathic transient osteoporosis of the hip].

Four patients with idiopathic transient osteoporosis of the hip were examined by magnetic resonance imaging (MRI). MRI clearly showed low signal intensity in the affected femoral head on T1-weighted images and high signal intensity on T2-weighted images. After regression of hip pain, MR images became normal. MRI was a useful method for diagnosis and follow-up study of idiopathic transient osteoporosis of the hip.

Adult↗
PubMed1989

Endoscopic management of carpal tunnel syndrome.

This article describes a subcutaneous endoscopic operative procedure for carpal tunnel syndrome and analyzes its effectiveness using electrophysiological data. Subcutaneous transverse carpal ligament release under universal subcutaneous endoscope (USE) was performed using local anesthesia without pneumotourniquet in 54 hands of 45 patients since June 1986. The mean follow-up period was 13.8 months. Sensory disturbances began to subside immediately after the operation and disappeared within 2 months in all cases. After the disappearance of sensory disturbances, we performed postoperative electrophysiological studies in 27 patients (33 hands). Postoperative electrophysiological data were significantly improved in all cases. Patients did not suffer from any serious complications such as motor branch injuries of the median nerve, hypesthesia of the palm, or injuries of the superficial palmar arch. From these results, we conclude that the transverse carpal ligament can be safely incised by this procedure.

Adult↗
PubMed1989

Five cases of ectopic liver and a case of accessory lobe of the liver.

Five cases of ectopic liver, two of retro-peritoneal cavity and three of gallbladder, and a case of accessory lobe of the liver, are reported. One of these cases with ectopic liver was accompanied by multiple cysts of the liver and kidney, and biliary microhamartoma, which was observed laparoscopically on the surface of the main liver and histologically proven in the ectopic liver.

Adult↗
PubMed1989

Pancreatic biopsy under visual control in conjunction with laparoscopy for diagnosis of pancreatic cancer.

Two cases of histologically confirmed pancreatic cancer are reported. Histological diagnosis was obtained after pancreatic biopsy was carried out under visual control in conjunction with laparoscopy using pancreatic biopsy forceps designed by us. In Case 1, localized swelling of the pancreas was observed on abdominal ultrasonography (US) and computer tomography (CT) scan, and interruption of the main pancreatic duct was demonstrated by endoscopic retrograde cholangiopancreatography (ERCP). In Case 2, a pancreatic tumor was detected by abdominal US and CT scan, but ERCP findings were only those of chronic pancreatitis.

Adenocarcinoma↗
PubMed1989

[Magnetic resonance imaging and histopathology in the femoral head].

To correlate the magnetic resonance (MR) images with the histopathological findings in the femoral head, the histopathology of 24 femoral heads, 15 with osteonecrosis, five with osteoarthritis and four with other hip disorders were subjected to preoperative MR imaging which demonstrated low intensity areas due to long T1 relaxation time in the femoral head. The MR signal was low where fibrovascular tissue, disintegrated fibrovascular tissue, amorphous necrotic material, bone, or cartilagenous tissue occupied the medullary space. From this study, it seems possible to predict the histopathologic changes in the femoral head using MR images.

Adult↗