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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 10 (2000), S. 832-840 
    ISSN: 1432-1084
    Keywords: Key words: Osteochondroma ; Complications ; Chondrosarcoma ; Bone tumors ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Osteochondromas can be complicated by mechanical irritation, compression or injury of adjacent structures, fracture, malignant transformation, and postoperative recurrence. Magnetic resonance imaging represents the most valuable imaging modality in symptomatic cases, because it can demonstrate typical features of associated soft tissue pathology, which can be differentiated from malignant transformation. Reactive bursae formation presents as an overlying fluid collection with peripheral contrast enhancement. Dislocation, deformation, and signal alterations of adjacent soft tissue structures can be observed in different impingement syndromes caused by osteochondromas. Magnetic resonance imaging provides excellent demonstration of arterial and venous compromise and represents the method of choice in cases with compression of spinal cord, nerve roots, or peripheral nerves, depicting changes in size, position, and signal intensity of the affected neural structures. Malignant transformation as the most worrisome complication occurs in approximately 1 % of solitary and 5–25 % of multiple osteochondromas. Magnetic resonance imaging is the most accurate method in measuring cartilage cap thickness, which represents an important criterion for differentiation of osteochondromas and exostotic (low-grade) chondrosarcomas. Cartilage cap thickness exceeding 2 cm in adults and 3 cm in children should raise the suspicion for malignant transformation. Finally, MR imaging can detect postoperative recurrence by depiction of a recurrent mass presenting typical morphological features of a cartilage-forming lesion.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 475-479 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Nine patients with Ewing’s sarcomas and seven patients with osteosarcoma of the fibula were treated surgically. The bone defect after tumour resection ranged from 5 to 25 cm (median 14 cm). Ten sarcomas were located in the proximal and six in the diaphyseal or distal fibula. Nine of ten patients with sarcomas located in the proximal fibula underwent a resection of the tumour including the common peroneal nerve. In one patient with a tumour in the proximal fibula, the peroneal nerve was preserved; however, this patient underwent amputation because of surgery with an intralesional margin. In five patients with a tumour in the distal fibula, the peroneal nerve was preserved. However, two of these five patients underwent amputation as an adequate surgical margin could not be achieved during resection. All ten patients in whom the peroneal nerve was resected achieved satisfactory function by wearing a peroneal brace. In patients with Ewing’s sarcoma of the proximal fibula, preservation of the common peroneal nerve may be chosen as an alternative possibility of resection.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 475-479 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Nine patients with Ewing's sarcomas and seven patients with osteosarcoma of the fibula were treated surgically. The bone defect after tumour resection ranged from 5 to 25 cm (median 14 cm). Ten sarcomas were located in the proximal and six in the diaphyseal or distal fibula. Nine of ten patients with sarcomas located in the proximal fibula underwent a resection of the tumour including the common peroneal nerve. In one patient with a tumour in the proximal fibula, the peroneal nerve was preserved; however, this patient underwent amputation because of surgery with an intralesional margin. In five patients with a tumour in the distal fibula, the peroneal nerve was preserved. However, two of these five patients underwent amputation as an adequate surgical margin could not be achieved during resection. All ten patients in whom the peroneal nerve was resected achieved satisfactory function by wearing a peroneal brace. In patients with Ewing's sarcoma of the proximal fibula, preservation of the common peroneal nerve may be chosen as an alternative possibility of resection.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 379-384 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present the results after surgical treatment in 15 patients who suffered from calcaneo-navicular coalitio. A total of 20 operations were performed on 19 feet (3 T-arthrodesis, 5 simple resections, 9 resections with fat interposition, 3 resections with muscle interposition). At the time of follow-up, the patients were examined clinically and radiologically. In addition, different functional tests were performed (heel-tip test, balance test, single-leg high jump, single-leg jumping course). Ten of 17 patients who underwent radiographic study at the follow-up had a successful result. Patients who had a coalitio showed a tibial rotation (heel-tip test) of 11.5°, and those patients without a coalitio had a tibia rotation of 20.3°. Concerning the functional outcome, 12 of 17 patients had a successful result. The range of motion of the subtalar joint did not correlate with the functional capacity of the ankle. Seven of 20 patients subjectively judged the outcome as a failure. The worst results were found in patients with pre-existing degenerative changes at the time of resection
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 116 (1997), S. 379-384 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present the results after surgical treatment in 15 patients who suffered from calcaneo-navicular coalitio. A total of 20 operations were performed on 19 feet (3 T arthrodesis, 5 simple resections, 9 resections with fat interposition, 3 resections with muscle interposition). At the time of follow-up, the patients were examined clinically and radiologically. In addition, different functional tests were performed (heel-tip test, balance test, single-leg high jump, single-leg jumping course). Ten of 17 patients who underwent radiographic study at the follow-up had a successful result. Patients who had a coalitio showed a tibial rotation (heel-tip test) of 11.5°, and those patients without a coalitio had a tibia rotation of 20.3°. Concerning the functional outcome, 12 of 17 patients had a successful result. The range of motion of the subtalar joint did not correlate with the functional capacity of the ankle. Seven of 20 patients subjectively judged the outcome as a failure. The worst results were found in patients with pre-existing degenerative changes at the time of resection
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 20 (1996), S. 233-236 
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé. Quatre patients ayant un ostéosarcome parostéal ont été traités par résection et cimentation. Toutes les tumeurs étaient localisées dans la partie distale du fémur. La marge de résection était marginale pour 3 patients et intralésionnelle pour un. Le grade histologique était de 1 pour 3 lésions et de 2 pour la quatrième. La durée de suivie varie entre 20 et 161 mois (en moyenne 88 mois) II n’y a eu aucune rechute locale jusqu’à maintenant. La fonction du membre affecté, traité par la méthode de cimentation temporaire et de greffe différée du péroné, est excellente. Le meilleur moment pour retirer le ciment serait un an après l’implantation.
    Notes: Summary. Four patients with parosteal osteosarcoma of the distal femur were treated by resection and insertion of cement. The resection was marginal in 3 patients and intralesional in one. The histology was grade 1 in 3 and grade 2 in one. The cement was subsequently removed and a fibular autograft used for reconstruction. The average follow up was 88 months (range 20 to 161 months). The function of the affected limb was excellent. The best time to remove the cement was after one year.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Gd-DTPA-BMA ; Magnetresonanztomographie ; Dynamische Studien ; Knochenläsionen ; Präoperative Chemotherapie ; Key words Gd-DTPA-BMA ; Magnetic resonance imaging ; Dynamic studies ; Bone lesions ; Preoperative chemotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Purpose: To evaluate the efficacy of high-dose Gd-DTPA-BMA (gadodiamide, Omniscan) as a contrast for magnetic resonance imaging of malignant bone tumors and the use of high-dose dynamic studies for predicting the response to preoperative chemotherapy. Materials and methods: Examinations were performed in 22 patients with suspected malignant bone tumor on a 1.5 T system. In 8 cases a follow-up examination was done after preoperative chemotherapy. Static studies included Pd- and T2-weighted spin-echo sequences as well as T1-weighted spin-echo sequences, obtained pre- and postcontrast. Dynamic studies were performed using a FLASH 2D-gradient-echo sequence (TR 40 ms/TE 10 ms, 90 ° flip angle) every 20 s after intravenous bolus injection of Gd-DTPA-BMA (0.3 mmol/kg body weight). MR images were evaluated qualitatively by visual assessment of conspicuity size, extraosseous delineation and structure of the lesion and quantitatively by measurement of the signal intensities and calculation of the relative increase in signal intensity. Results: Qualitative image analysis showed best demonstration of the lesions on contrast-enhanced T1-weighted images. Comparison of T1-weighted pre- and postcontrast spin-echo sequences revealed significantly better assessment of tumor structure after administration of contrast media. After preoperative chemotherapy, all responders showed a markedly stronger reduction in relative increase in signal intensity in dynamic studies compared to nonresponders. Conclusion: Gd-DTPA-BMA is effective for magnetic resonance imaging of musculoskeletal lesions and improves assessment of the tumor structure. Dynamic studies may help to predict the response to preoperative chemotherapy.
    Notes: Zusammenfassung Ziel der Studie: Untersucht wurde, ob die hochdosierte Gabe von Gd-DTPA-BMA (Gadodiamid, Omniscan™) sich für die kontrastmittelunterstützte Magnetresonanztomographie maligner Knochentumoren eignet und ob dynamische Studien bei dieser Dosis eine Beurteilung des Ansprechens auf eine präoperative Chemotherapie ermöglichen. Material und Methode: Die Untersuchungen erfolgten bei 22 Patienten mit Verdacht auf malignen Knochentumor bei einer Feldstärke von 1,5 Tesla. In 8 Fällen wurde eine Verlaufskontrolle nach präoperativer Chemotherapie durchgeführt. Die statischen Untersuchungen umfaßten PD- und T2-gewichtete Spinechosequenzen sowie T1-gewichtete Spinechosequenzen vor und nach Kontrastmittelapplikation. Dynamische Studien wurden mit einer FLASH-2D-Gradientenechosequenz (TR 40 ms/TE 10 ms, Flipwinkel 90 °) im Abstand von je 20 s nach intravenöser Bolusinjektion von Gd-DTPA-BMA (0,3 mmol/kg Körpergewicht) durchgeführt. Die Auswertung der MR-Bilder erfolgte qualitativ durch visuelle Beurteilung der Erkennbarkeit, der Größe, der extraossären Ausdehnung und der Struktur der Läsion und quantitativ mit Messung der Signalintensitäten und Berechnung des relativen Signalanstieges. Ergebnisse: Die qualitative Bildauswertung ergab für die T1-gewichteten Bilder nach Kontrastmittelapplikation die beste Erkennbarkeit der Läsion. Der Vergleich der T1-gewichteten Spinechosequenz vor und nach Kontrastmittelapplikation zeigte eine signifikant verbesserte Beurteilbarkeit der Tumorstruktur nach Kontrastmittelgabe. In den dynamischen Untersuchungen wiesen alle Responder nach präoperativer Chemotherapie einen deutlich stärkeren Abfall des relativen Signalintensitätsanstieges als die Nonresponder auf. Schlußfolgerung: Gd-DTPA-BMA ist ein effektives Kontrastmittel für die Magnetresonanztomographie muskuloskeletaler Läsionen und ermöglicht eine verbesserte Beurteilung der Tumorstruktur. Dynamische Studien können zur Beurteilung des Ansprechens der präoperativen Chemotherapie beitragen.
    Type of Medium: Electronic Resource
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