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  • 1
    ISSN: 1436-2023
    Keywords: Key words: hip ; acetabulum ; labrum ; MRI ; radial-sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: We investigated the usefulness of a radial-sequence magnetic resonance imaging (MRI) technique in the visualization of the acetabular labrum, which surrounds the acetabulum. In 22 hip joints of 12 volunteers, T2-weighted images were obtained on 24 radial planes of the acetabular rim, set at 15°-intervals, using the small tip angle gradient echo method. We examined 7 planes in the weight-bearing portion. The acetabular labrum in the weight-bearing portion was depicted in good contrast to the surrounding tissues. The shape of the labrum differed among individuals and also in the anterior and posterior portions of the labrum. The signal intensity of the labrum was low or partially moderate. There was a high signal intensity band on the base of the acetabular labrum in several portions, which should be carefully interpreted to avoid confusion with abnormality. We concluded that radial-sequence MRI could be a useful technique for evaluation of the condition of the acetabular labrum in the weight-bearing portion.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1436-2023
    Keywords: Key words Osteoarthritis ; Acetabular dysplasia ; Bombelli's osteotomy ; Valgus-extension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Severe osteoarthritis due to acetabular dysplasia (n = 17) was treated with valgus-extension osteotomy, and the patients' clinical outcomes 10–14 years after operation were evaluated according to clinical factors (Japanese Orthopaedic Association hip score; JOA score) and by roentgenography. The mean JOA score 10 years or later had improved by 22 points compared with the preoperative score. On roentgenography, joints which had preoperative roof osteophyte had better postoperative formation of roof osteophyte. The JOA score was higher in the 12 joints which had osteophyte 5 mm or longer than in those joints with osteophyte that was 5 mm or shorter. Postoperative joint space widening occurred in 15 joints (88.2%) 3–6 months postoperatively, and it reached the maximum at 3–5 years. In patients who had a large bone cyst in the femoral head preoperatively, the cyst collapsed, and deformation of femoral head occurred after operation, but remodeling of the joint surface occurred naturally and the congruity improved. In the 6 joints in which the preoperative acetabular head index was less than 60% and the acetabular angle was larger than 30°, the JOA score at 10 years or later was lower than that of the other joints. Based on these findings, valgus-extension osteotomy was evaluated as a useful surgical method for advanced or terminal osteoarthritis in young or middle-aged patients. Predictive factors for long-term prognosis would be the preoperative length of roof osteophyte, joint space widening, and the degree of femoral head covering.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1436-2023
    Keywords: Key words Osteonecrosis ; Femoral head ; Bone marrow edema ; MRI ; Histology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sequential magnetic resonance imaging (MRI) was performed on a 38-year-old woman with systemic lupus erythematosus who had received corticosteroid and had developed non-traumatic osteonecrosis of the femoral head. The initial MR finding was a band lesion on the T1-weighted image, which had been present before the onset of symptoms. At the onset of symptoms, a diffuse bone marrow edema pattern, with a low signal intensity on T1 and high signal intensity on T2-weighted images, was noted around the band lesion, extending to the femoral neck. Histopathologically, this region was found to consist of serous exudate, focal interstitial hemorrhage, and mild fibrosis, without any evidence of extension of osteonecrosis. It should be noted that extension of a low signal intensity area on MRI after the onset of hip pain may not be the result of the extension of osteonecrosis, but may represent concomitant edema due to collapse.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-5195
    Keywords: Transplantation ; Cartilage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Comportement et évolution du cartilage articulaire transplanté ont été étudiés chez 180 lapins adultes par microscopie électronique, colorations histologiques et autoradiographies. Quatre semaines après la transplantation, une fine couche de tissue conjonctif qui s'étend depuis les bords recouvre la jonction entre le cartilage du receveur et le cartilage transplanté. Vingt-quatre semaines après la transplantation, le tissu cartilagineux commence à dégénérer à la périphérie du greffon. Cependant, à la partie centrale de celuici, des cellules cartilagineuses survivantes peuvent être mises en évidence grâce à l'autoradiographie au S35.
    Notes: Summary Behaviour and fate of the transplanted articular cartilage were studied in 180 adult rabbits, using the scanning electron microscope, histological staining and autoradiographic examination. The junction between the host cartilage and the transplanted cartilage was covered with thin connective tissue layers which extended from the edges 4 weeks after transplantation. After the 24th week of transplantation the cartilage tissue appeared to be degenerating at the periphery of the graft. However, in the middle portion of the graft surviving cartilage cells were observed using 35S autoradiography.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé  Deux patients, l’un avec un ostéosarcome, l’autre avec un sarcome d’EWING, furent opérés en 1987–1988 avec remplacement prothétique du fémur, associéà une chimiothérapie. Ces patients ont été suivis sans qu’il soit noté de récidive. Il n’y a pas de descellement, ni de luxation de la prothèse. Un score fonctionnel évalué selon les critères de l’ISOLS, montre une conservation de 60% et 63% de la fonction du membre inférieur.
    Notes: Abstract  One patient with osteosarcoma and one with Ewing’s sarcoma of the femur were in 1987 and 1988 treated with prosthetic replacement of the femur and chemotherapy. There has been no loosening of the prostheses and no recurrence of the tumor. The patients have maintained 60% and 63% limb function scores evaluated by ISOLS criteria.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 29 (2000), S. 346-348 
    ISSN: 1432-2161
    Keywords: Key words Amyloid tumor ; Tibia ; Periosteum ; Bilateral ; MRI ; Bilateral metachronous periosteal tibial amyloid tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Localized primary periosteal amyloid tumors are extremely rare. A case of bilateral tibial amyloid tumor is presented. A 62-year-old woman initially presented with a painful mass in the anterior aspect of the right leg. There was no evidence of underlying systemic disease, including chronic infection or malignancy. Based on the results of resistance with Congo red staining to treatment with potassium permanganate and positivity for kappa light chain, we classified this particular case as AL-type amyloidosis. The patient noticed a swelling in the opposite leg 2 years later. The second tumor was also an AL-type amyloidoma. Amyloid tumors are generally solitary. This is the first case of bilateral periosteal amyloid tumors of the AL-type occurring in the tibiae.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2161
    Keywords: Key words Transient osteoporosis of the hip ; Osteonecrosis ; Osteopenia ; Bone marrow edema ; Femoral head
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. It has been proposed that transient osteoporosis of the hip (TOH) may represent the early reversible phase of osteonecrosis of the femoral head (ON). The purpose of this study was to investigate the clinicopathologic characteristics of three cases of TOH. Design and patients. A bone biopsy was performed on three patients who had been diagnosed as having TOH based on the clinical course, radiograph, bone scintigram, and MR images. The biopsy specimens were studied histopathologically by light and electron microscopy. Results. The most characteristic feature of TOH was focal areas of thin and disconnected bone trabeculae covered by osteoid seams and active osteoblasts. The surrounding bone marrow tissue showed edematous changes and mild fibrosis, frequently associated with vascular congestion and/or interstitial hemorrhage. No osteonecrotic region was observed in either the bone trabeculae or the bone marrow tissue. All patients have improved clinically and in the 3.5–9 years of follow-up have shown no evidence of ON. Conclusions. This study supports the concept that transient osteoporosis of the hip is a distinct entity.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of orthopaedic science 1 (1996), S. 214-229 
    ISSN: 1436-2023
    Keywords: peripheral nerve ; neurotmesis ; epineurial suture ; funicular suture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Peripheral nerve suture (neurorrhaphy) is a method of nerve repair that has been employed for many years, although the development and spread of microsurgery has helped to improve the techniques used. Now, by using microscopes and microsurgical techniques, peripheral nerve suturing can be performed more precisely and atraumatically than in the past. The technique is now indicated for a wider range of cases, including suturing of the brachial plexus and its branched axillary nerve, and for digital nerves. In addition to conventional epineurial sutures, a funicular suture has been introduced, and results using these two methods are now being compared. Advances have also been made in the field of rehabilitation, including the introduction of electromyogram (EMG) biofeedback therapy and re-education of sensation. Included in the issues that need to be further addressed are the treatment of nerve injuries caused by severe crushing and traction, and misdirection of regenerated nerves. It is hoped that more studies will be carried out to encompass a broad range of topics, from basic research to promote nerve regeneration to rehabilitation. In this paper, the author reviews the past 20 years, experience of peripheral nerve suturing, discusses the problems encountered, and outlines future prospects.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1436-2023
    Keywords: Key words Total hip arthroplasty ; Cementless ; Harris-Galante type ; Long-term results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Long-term clinical results of Harris-Galante type prosthesis in total hip arthroplasty (THA) were evaluated in 27 hip joints of 25 patients (2 men and 23 women). Seventeen joints also received bone grafting on the acetabulum. Mean follow-up period was 11 years and 3 months. Clinical out-come was evaluated using the hip score of the Japanese Orthopaedic Association, and the score was good and stable during the monitoring period. Implant stability, bone changes around the implant, and the occupancy rate of the stem in the medullary space were radiologically examined. As a result of stem, there was subsidence in 3 joints and loosening in 6. There were no cases of cup loosening. A pedestal was found in 12 joints, and 4 of them which were associated with a radiopaque line had stem loosening. Among the 21 joints without loosening, 8 had a pedestal but they were not associated with a radiopaque line. The 2 joints which developed osteolysis did not have loosening. Stem loosening was related to the stem occupancy rate in the distal part of the medullary cavity. Postoperative stem occupancy rate could be an important indicator for long-term clinical results. Stems for cementless THA should be designed to have a high occupancy rate in the distal part, and stems should also be carefully chosen to meet individual differences.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of orthopaedic science 5 (2000), S. 317-317 
    ISSN: 1436-2023
    Keywords: Key words Orthopedic research ; Evidence-based medicine ; Nonoperative treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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