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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 60-65 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this prospective study we followed the bone mineral content (BMC) changes over time in seven zones of interest around uncemented Zweymueller total hip arthroplasty (THA) components, using dual-energy X-ray absorptiometry (DEXA) combined with a radiographical analysis of the distal femoral cortices, close to the tip of the stem. In 36 women (average age 55 years) operated on for primary hip osteoarthritis, BMC of the hips was measured preoperatively and 2 weeks, 1 year and 4 years post-operatively. In particular, a significant decrease of the pre-operative values (ranging from 35% to 42.53%; P = 0.05 to 0.01) was noted immediately postoperatively in zones 2–7. Thereafter, an additional significant increase of BMC was observed between the first and last observations at the greater (30%, P 〈 0.05) and lesser (35.48%, P 〈 0.01) trochanter. The BMC changes over time were not related to the age of the patients. The BMC reduction observed immediately after implantation of the Zweymueller THA is probably related to the intraoperatively removed bone from (1) the medial and distal inner surface of the acetabulum and (2) the inner femoral cortex. Thereafter, the BMC in zones 2, 6 and 7 remained practically unchanged. The fact that a significantly delayed BMC increase was found in the region of the greater and minor trochanter 4 years later may be due to an increasing, continuous bone turnover in the intertrochanteric area. Thus, the Zweymueller screw socket becomes definitively anchored immediately postoperatively in the medial and distal thirds of the acetabulum and remains stable over time, whereas the Zweymueller stem is mainly anchored within the distal femoral cortex as well as within the mass of the greater and minor trochanter, and was still stable at the 4-year follow-up.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 116 (1996), S. 60-65 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this prospective study we followed the bone mineral content (BMC) changes over time in seven zones of interest around uncemented Zweymueller total hip arthroplasty (THA) components, using dual-energy X-ray absorptiometry (DEXA) combined with a radiographical analysis of the distal femoral cortices, close to the tip of the stem. In 36 women (average age 55 years) operated on for primary hip osteoarthritis, BMC of the hips was measured preoperatively and 2 weeks, 1 year and 4 years postoperatively. In particular, a significant decrease of the preoperative values (ranging from 35% to 42.53%; P = 0.05 to 0.01) was noted immediately postoperatively in zones 2–7. Thereafter, an additional significant increase of BMC was observed between the first and last observations at the greater (30%, P 〈 0.05) and lesser (35.48%, P 〈 0.01) trochanter. The BMC changes over time were not related to the age of the patients. The BMC reduction observed immediately after implantation of the Zweymueller THA is probably related to the intraoperatively removed bone from (1) the medial and distal inner surface of the acetabulum and (2) the inner femoral cortex. Thereafter, the BMC in zones 2, 6 and 7 remained practically unchanged. The fact that a significantly delayed BMC increase was found in the region of the greater and minor trochanter 4 years later may be due to an increasing, continuous bone turnover in the intertrochanteric area. Thus, the Zweymueller screw socket becomes definitively anchored immediately postoperatively in the medial and distal thirds of the acetabulum and remains stable over time, whereas the Zweymueller stem is mainly anchored within the distal femoral cortex as well as within the mass of the greater and minor trochanter, and was still stable at the 4-year follow-up.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0932
    Keywords: Osteoporosis ; Halo vest ; Cervical spine trauma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this prospective study we followed the bone mineral density (BMD) changes of the injured cervical spine immobilized with the halo vest. In order to define the natural history of cancellous vertebral bone loss and restoration, dual-energy densitometry was used on each of ten selected cervical spines in the lateral view (1) immediately after the application of the device, (2) at the end of the treatment and (3) 3 months after the removal of the halo vest. The halo vest produces local osteoporosis in the immobilized cervical spine with an overall reduction of BMD averaging 2.83% (P 〈 0.05). The response of the cervical spine to immobilization was only slightly different from patient to patient and between different vertebral bodies in each particular spine. The type and the level of injury of the cervical spine were not related to the changes of BMD, age or gender of the patient, whereas the local osteoporosis was mostly reversible in the follow-up evaluation of 5–6 months.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0932
    Keywords: Thoracolumbar fractures ; Harrington rods ; Zielke device
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirty consecutive patients who had suffered unstable fractures and dislocations of the thoracolumbar spine mostly associated with neurologic impairment and bony encroachment on the spinal canal were treated either with Harrington distraction rods combined with sublaminar wires or with the Zielke-VDS device. These patients were subsequently assessed for neurologic outcome, spinal canal clearance, sagittal and coronal spinal deformity correction preoperatively and postoperatively with a minimum follow-up of 26 months. In the follow-up evaluation, the patients who underwent surgery with Harrington rods showed an overall improvement of their neurologic function of 90.9%, whereas all patients who underwent the Zielke operation improved. Preoperatively, positive correlations were found between the level of injury and Frankel grades; the cord lesion tended to demonstrate more severe neurologic deficit when compared with cauda equina ones (P 〈 0.001). Furthermore, dislocation accompanying the injury resulted in a more severe neurological deficit (P 〈 0.05). Harrington rods and Zielke device offer sufficient initial correction of the frontal spinal deformity but did not significantly either restore or maintain sagittal plane alignment. The Harrington series showed an overallimprovement of the segmental kyphosis of 26% (NS), with a subsequent loss of correction of 7.38% (NS) on the follow-up observation. The Zielke device produced an immediate, much better correction of the segmental posttraumatic kyphosis of 45% (NS), but a loss of correction of 22.9% (NS) was measured in the follow-up evaluation. Correction of the anterior and posterior vertebral height was shown to be better for the Zielke patient group. The coronal deformity was completely corrected equally well by the Harrington and Zielke devices. There was no statistically significant correlation between the degree of bony encroachment of the spinal canal and the initial Frankel grade. Additionally, no statistically significant correlation was found between correction of the sagittal deformity, restoration of anterior and posterior vertebral height, coronal deformity correction, and clearance of the vertebral canal. Concerning neurological status, no patient in either group was worse in the follow-up evaluation. A significant correlation was found between the age of the patient and the neurological improvement favoring young patients (P 〈 0.001).
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0932
    Keywords: Osteoporosis ; Burst fracture ; Paraplegia ; Harrington fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This is a report of seven patients suffering from osteoporosis, who sustained unstable burst fractures in the thoracolumbar spine associated with neurological impairment, without trauma. The manner of presentation, the neurological involvement, the radiological findings, as well as the surgical treatment with respect to functional and neurological recovery are discussed.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European journal of orthopaedic surgery & traumatology 7 (1997), S. 27-32 
    ISSN: 1432-1068
    Keywords: Bone mineral changes ; Hip prosthesis ; Prothèse de hanche ; Minéralisation osseuse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Nous avons suivi dans cette étude prospective les changements dans le temps du contenu minéral osseux (CMO) selon sept zones osseuses d'intérêt bien défini (1–7), autour des composants de la prothèse totale de hanche sans ciment, en utilisant la densitométrie aux rayons X à double énergie, ainsi qu'une analyse radiologique près de la pointe de la tige de Zweymueller, afin de mesurer tout changement postopératoire de l'épaisseur de la corticale. Un groupe de 36 patientes avec une moyenne d'âge de 50 ans, ayant une ostéoarthrite primaire de la hanche, fut étudié. Les mesures du CMO ont été réalisées en pré-opératoire, et à 2 semaines, un an et quatre ans en postopératoire. Les changements du CMO concernant cette étude furent significatifs statistiquement dans les Zones 1, 3, 4, 5, 6 et 7 (valeurs P 0.05–0.01 alors que la Zone 2 ne l'était pas. Les changements dans le temps du CMO pour toutes les zones d'intérêt n'avait aucun rapport avec l'âge des patientes. Nous pensons que que la réduction du CMO, observée Zones 2 à 7, immédiatement après l'implantation de la PTH de Zweymueller, peut être expliquée par l'ablation per-opératoire de l'os. En conclusion (1) la prise de la vis trouve son ancrage définitif immédiatement après l'opération aux tiers médial et distal de la cavité cotyloïde et demeure stable dans le temps, sans aucun changement du contenu minéral osseux; (2) la tige de Zweymueller trouve son ancrage principal dans la corticale fémorale distale et reste stable jusqu'à 4 ans d'observation postopératoire, sans changement significatif du contenu minéral osseux; et (3) la tige de Zweymueller trouve deux points supplémentaires de fixation dans la masse des grand et petit trochanter, où elle induit un renouvellement osseux continu avec l'épaississement trabéculaire, qui s'étale probablement sur plus de 4 ans.
    Notes: Summary In this prospective study we followed the bone mineral content (BMC) —changes over time at seven distinct well defined bone Zones (1–7), around the uncemented Zweymueller total hip arthroplasty (THA) components, using dual energy xray densitometry, and a roentgenographical analysis close to the tip of the Zweymueller stem, to measure any postoperative cortical thickness changes. A homogenous group of 36 female patients, average age of 55 years, with primary hip osteoarthritis was studied. The BMC — measurements were made preoperatively, 2 weeks, one year and four years postoperatively. The BMC-changes in this study were showen to be statistically significant at the Zones 1, 3, 4, 5, 6 and 7 (P-values 0.05–0.01), whereas at the Zone 2 they were not. The BMC- changes over time for all Zones of interest were not related to the age of the patients. We believe that the BMC-reduction, observed at the Zones 2 to 7, immediately after implantation of the Zweymueller THA, should be related to the intraoperatively removed bone. Conclusions :(1) the Zweymueller screw socket finds its definitive anchorage immediately postoperatively at the medial and distal thirds of the acetabulum and remains stable over time, without any further bone mineral content-changes; (2) the Zweymueller stem finds its main anchorage within the distal femoral cortex and remains stable up to 4-year-observation, without significant bone mineral content changes; and (3) the Zweymueller stem finds two additional points of fixation within the mass of the greater and lesser trochanter, where it induces a continuous bone turnover with bone trabeculae thickening, which probably extends more than 4 years.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 21 (1997), S. 30-34 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé. Les auteurs ont mesuré chez 36 patientes opérées pour coxarthrose primitive les modifications de la densité osseuse autour des composants de la prothèse totale de Zweymueller en utilisant la méthode d’absorptiométrie (dual energy X-ray absorptiometrie: DEXA) selon 7 localisations. Il n’a pas été relevé de modification significative de la densité osseuse autour du cotyle vissé, ni de la région du grand trochanter, alors qu’une réduction significative de cette densitéétait mesurée juste après l’intervention: 1&;°) au niveau du petit trochanter (32,16± 18,15%, P 〈 à 0,05), et 2&;°) au niveau de la corticale fémorale interne et externe à hauteur de l’extrêmité de la tige prothétique (18,6±12,82%, P 〈 0,0005 et 21,96 ±15,8%, P 〈 0,0005 respectivement). Ces modifications de la densité ne sont pas en relation avec l’âge des patientes. La diminution de la densité au niveau du fémur est dûe principalement à la perte osseuse liée à la préparation opératoire. La fixation de la tige de Zweymueller par ajustage n’induit pas, dans cette série, d’autres modifications osseuses avec le temps. L’absence de modification de la densité osseuse au niveau de l’os acétabulaire est certainement dûe à la relative préservation de l’os sous-chondral lors de l’intervention et ensuite à la stabilité de la fixation cotyloïdienne pendant les 4 ans de l’étude.
    Notes: Summary. Changes in bone mineral density (BMD) around the components of the Zweymueller total hip arthroplasty were measured, using dual energy X-ray absorptiometry, in 36 women who were operated on for primary osteoarthritis. Seven regions of interest were studied. No changes occurred around the screw socket and the greater trochanter, but there was a significant reduction of BMD, only when measured immediately after the operation at the lesser trochanter and at the distal femoral cortex lateral and medial to the tip of the stem. These changes were not related to the age of the patients. The reduction of BMD in the femur was mostly associated with areas where bone had been removed at operation. The press-fit fixation of the Zweymueller stem and the maintenance of its fixation with time did not induce further bone turn-over around it. The absence of changes in bone mineral density was due to the relatively small amount of subchondral removed and to the continued stable fixation of the socket.
    Type of Medium: Electronic Resource
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