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  • 1
    Electronic Resource
    Electronic Resource
    Spatial light modulators using ferroelectric liquid crystal (1992)
    Springer
    Optical and quantum electronics 24 (1992), S. 1151-1163 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Basic structures and functions of optically addressed spatial light modulators (SLMs) are discussed in the context of system applications. The most important functions imposed on spatial light modulators are those of image acceptance and transducers. SLMs using ferroelectric liquid crystal (FLC) satisfy essential requirements for high levels of resolution, sensitivity and response speed. We specifically surveyed the current performance of bipolar-operational spatial light modulators (BSLMs) that sufficiently exploit the bistability of FLC to output reversibly positive and negative images and to store them. The high performance of BSLMs makes them useful for many optical applications including image processing and real-time holography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620311
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Local application of basic fibroblast growth factor into the bone increases bone mass at the applied site in rabbits (1996)
    Springer
    Archives of orthopaedic and trauma surgery 115 (1996), S. 344-346 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of basic fibroblast growth factor (bFGF) applied locally into the bone under physiological conditions was investigated. An aqueous solution containing Oμg (vehicle), 100 μg or 400 μg recombinant human bFGF was percutaneously applied through a needle into the right ilium in rabbit, and the ilia were harvested 4 weeks after the application. Compared with vehicle-treated animals, bone mineral density measured by dual-energy X-ray increased in the 400 μg bFGF group. The width of trabeculae in the bFGF-treated groups was greater than in the vehicle group. These results showed that bFGF applied locally into the bone under physiological conditions affected bone formation, and suggested that such an application might have potential for increasing bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420329
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Familial occurrence of hyperplastic callus in osteogenesis imperfecta (1997)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 500-503 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract There is a hypothesis that hyperplastic callus (HC) in osteogenesis imperfecta (OI) is not merely a rare complication but could actually be inherited, although this idea has not yet been investigated. We described two cases, a mother and son, with mild OI, normal scleral colour and no dentinogenesis imperfecta, who repeatedly had HC in their femur. Familial occurrence of HC was found in 13 cases in 5 families among 21 cases in 7 families with a familial background of OI in the literature (including this report). This is higher than the reported incidence of HC, 1.5% (5 cases of 333), and the mode of transmission is concomitant with autosomal dominant inheritance in all these families. Since a review of 47 cases in the literature shows that HC occurs independently of scleral colour and the degree of bone fragility, it may be an additional criterion for subdivision within each type of the Sillence classification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387587
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A simple technique for correction of complicated tibial deformity including rotational deformity (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 259-261 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although the simplest way to correct bone deformity is one-stage correction, the problem associated with that method is overstretching of the soft tissues, which limits the correction and leads to complications such as compartment syndrome or peripheral nerve palsy. If an adequate amount of tissue necessary for correction is formed in advance, the deformity can be corrected safely at one stage without overstretching of the tissues. A leg lengthening technique was employed to form the necessary tissues. After leg lengthening with an unilateral external fixator (Hifixator), deformities were corrected manually at one stage without anesthesia, and the corrected positions were again secured with the fixator. To correct rotational deformity, two sets of pins were inserted into the proximal bone fragment of the tibia at the time of the operation, and after lengthening the proximal pin clamp of the fixator was disconnected from one pin set and reconnected to the other set. We applied this method to four tibias of three patients without any complications. The tension of the tissues was monitored using a pressure sensor built into a Hifixator to prevent the tissues from overstretching. During and after the correction, the tension of the tissue was maintained at less than before the correction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050241
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  • 5
    Electronic Resource
    Electronic Resource
    Familial occurrence of hyperplastic callus in osteogenesis imperfecta (1997)
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 500-503 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract There is a hypothesis that hyperplastic callus (HC) in osteogenesis imperfecta (OI) is not merely a rare complication but could actually be inherited, although this idea has not yet been investigated. We described two cases, a mother and son, with mild 01, normal scleral colour and no dentinogenesis imperfecta, who repeatedly had HC in their femur. Familial occurrence of HC was found in 13 cases in 5 families among 21 cases in 7 families with a familial background of OI in the literature (including this report). This is higher than the reported incidence of HC, 1.5% (5 cases of 333), and the mode of transmission is concomitant with autosomal dominant inheritance in all these families. Since a review of 47 cases in the literature shows that HC occurs independently of scleral colour and the degree of bone fragility, it may be an additional criterion for subdivision within each type of the Sillence classification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387587
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Changes of callus diameter during axial loading and after fixator removal in leg lengthening (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 464-467 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We retrospectively reviewed nine tibial lengthenings in seven achondroplastic patients. The callotasis method was used, and a unilateral type lengthener, either the Dynamic Axial Fixator (Orthofix, Italy; eight legs) or the High Functional Fixator (Matsumoto Co., Japan; one leg), was applied. The distracted length averaged 14.6 (range 10–18) cm. The minimum diameter of the callus was measured using a ruler on anteroposterior and lateral radiographs. The callus diameter ratio (%) was calculated as the callus diameter divided by the original diaphysis diameter. For periods during axial loading and after removal of the fixator in each patient, a single regression line was drawn on the callus diameter ratio data using the least squares method, and the diameter change rate (%/day) was evaluated by inclination of this line. The diameter change rates during axial loading were negative in six legs, but those after fixator removal were positive in all legs, and the latter were significantly greater than the former. The diameter change rates after fixator removal on the anteroposterior radiographs were negatively correlated with the callus diameter ratio at the time of fixator removal (r = 0.84, P = 0.0008). Simple axial loading may not be a sufficient mechanial environment for restoration of the physiological shape, and it is important to be aware that we cannot expect the callus diameter to increase by this means alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050294
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  • 7
    Electronic Resource
    Electronic Resource
    Risk factors of myelopathy at the atlantoaxial level in spondyloepiphyseal dysplasia congenita (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 468-470 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Spondyloepiphyseal dysplasia congenita (SEDC) can be accompanied by hypoplasia of the odontoid and/or lax ligaments which may lead to spinal cord compression. Since an early diagnosis of myelopathy is essential for rational treatment, identification of the high-risk factors is imperative. Sixteen patients were retrospectively reviewed, 10 male and 6 female, and their average age at the time of examination was 18 (range 3–37) years. Myelopathy was seen in 6 individuals. Five were associated with atlantoaxial subluxation, and the critical value of space available for the spinal cord at the level of the atlas was 10 mm or less. Their height was less than –7SD of average Japanese of the same age, and all were associated with severe coxa vara. Although SEDC itself is a risk factor, marked short stature of less than –7SD and severe coxa vara are particularly high-risk factors for cord compression at the level of the atlas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050295
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  • 8
    Electronic Resource
    Electronic Resource
    Remission of idiopathic thrombocytopenic purpura after femoral lengthening (1999)
    Springer
    Archives of orthopaedic and trauma surgery 119 (1999), S. 100-102 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report on a patient with chronic idiopathic thrombocytopenic purpura (ITP) who went into remission after femoral lengthening. Although it is possible that spontaneous remission (frequency 5%–10%) of chronic ITP coincided with the femoral lengthening, limb lengthening could also have caused the thrombocytosis. This case suggests a close relationship between osteogenesis and hematopoiesis during regenerate bone formation. Limb lengthening can therefore be defined as the formation not only of bone and soft tissue but also of hematopoietic tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050366
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  • 9
    Electronic Resource
    Electronic Resource
    Swelling of the dorsum of the hand and/or foot can be a first sign of Maffucci syndrome (1999)
    Springer
    Archives of orthopaedic and trauma surgery 119 (1999), S. 470-473 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cardinal feature of Maffucci syndrome is the coexistence of enchondromatosis and vascular anomalies. The patients are usually normal at birth, the disease becoming evident at any time up to puberty. Association of soft-tissue swelling has been described in this syndrome but has not been listed as a sign or symptom. We report three cases in which the initial sign was diffuse swelling of the dorsum of the hand and/or foot. This was noticed at birth in cases 1 (girl) and 3 (girl) and at the age of 1 month in case 2 (boy), who otherwise appeared normal except for case 3 who had a rectovestibular fistula. The pathology of the swollen soft tissue was adipose tissue associated with various degrees of thickened and fibrotic septum containing dilated lymphatic channels. These dilated channels within the septum were so subtle that they were initially overlooked in cases 1 and 2. Awareness that swelling of the dorsum of the hand or foot can be the sole sign and symptom of Maffucci syndrome before the typical indications become evident helps the physician establish an early diagnosis of this condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050024
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  • 10
    Electronic Resource
    Electronic Resource
    Callus formation in the humerus compared with the femur and tibia during limb lengthening (1998)
    Springer
    Archives of orthopaedic and trauma surgery 117 (1998), S. 262-264 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We investigated whether the callus formation in the humerus during the distraction period of limb lengthening proceeds at a higher rate than that in the femur and tibia. Ten achondroplastic patients underwent 3 bilateral humerus, 3 bilateral femur and 4 bilateral tibia lengthenings. To reduce the confounding effect of bone size, we used bone mineral apparent density (BMAD) to compare the three groups; this is a volumetric bone mineral density measurement. BMAD in the distracted callus space was evaluated at 8 weeks after the start of distraction using dual-energy X-ray absorptiometry (mean ± SD; g/cm3): in the humerus (0.24 ± 0.08) it was significantly higher than in the tibia (0.10 ± 0.02), while there was no difference between the humerus and femur (0.35 ± 0.11). We conclude that the callus formation in the humerus during the distraction period of limb lengthening proceeded at a significantly faster rate than in the tibia, but there was no significant difference between the humerus and femur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050242
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