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  • 1
    ISSN: 1279-8517
    Keywords: Shoulder ; Supraspinatus outlet syndrome ; Computed tomography ; Mineralization ; Subacromial space
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une réduction de l'espace sous-acromial et une augmentation de la pression sous-acromiale avait été considérées comme jouant un rôle très important dans la pathogénie des lésions de la coiffe des rotateurs. L'objectif de cette étude est de développer une méthode basée sur la tomodensitométrie, pour mesurer la distance acromio-humérale et la minéralisation de la partie inférieure de l'acromion. Chez 7 patients avec une rupture unilatérale de la coiffe des rotateurs et deux avec un syndrome de conflit, des images acquises en coupes axiales transverses étaient obtenues avec une section d'épaisseur de 1 mm en situation de relaxation musculaire dans une position standard. Les structures osseuses étaient ensuite reconstruites en trois dimensions, la distance minimale verticale entre l'acromion et l'humérus était déterminée sur trois images frontales des deux côtés. La distribution de la minéralisation à l'intérieur de la surface caudale de l'acromion était évaluée en utilisant une méthode d'ostéo-absorptiométrie. Bien que le score de Constant était significantivement réduit chez les épaules malades, l'épaisseur de l'espace sous-acromial n'était pas systématiquement plus bas que du côté controlatéral. Dans 7 cas, les zones de minéralisation maximale de l'acromion étaient identiques dans les deux épaules et dans 2 cas étaient plus basses du côté affecté. Cette étude préliminaire suggère qu'avec la relaxation musculaire, un amincissement de l'espace sous-acromial ne peut pas être détecté sur des images de reconstruction frontale, par tomodensitométrie tridimensionnelle et qu'un potentiel d'accroissement de la pression subacromiale n'est pas assez élevé pour causer une augmentation de la densité osseuse de l'acromion. La méthode présentée rend possible l'investigation de la pathogénie du défilé du m. supraépineuxin vivo avec une plus grande précision que ce qui a été possible jusqu'alors avec la radiographie conventionnelle.
    Notes: Summary A reduction of the subacromial space and an increased subacromial pressure have been considered to play an important role in the pathogenesis of rotator cuff lesions. The objective of the current study was to develop a CT based method for measuring the acromiohumeral distance and inferior acromial mineralization. In seven patients with unilateral rupture of the rotator cuff and two with impingement syndrome, transverse CT images were obtained at a section thickness of 1 mm with muscular relaxation in a standardized position. The bones were then reconstructed three-dimensionally, and the minimal vertical distance between the acromion and the humerus was determined in three secondary frontal images on both sides. The distribution of mineralization within the inferior surface of the acromion was assessed using CT osteoabsorptiometry. Although the Constant score was significantly reduced in the diseased shoulders, the width of the subacromial space was not routinely lower than on the contralateral side. In seven cases the maximal inferior acromial mineralization was identical in both shoulders, and in two cases it was lower on the affected side. These preliminary data suggest that with muscular relaxation no narrowing of the subacromial space can be detected in secondary frontal CT images, and that a potential increase of subacromial pressure is not high enough to cause a measurable increase in inferior acromial bone density. The method presented makes it possible to investigate the pathogenesis of the supraspinatus outlet syndromein vivo with greater precision than has so far been possible with conventional radiography.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1279-8517
    Keywords: Shoulder ; Supraspinatus outlet syndrome ; Computed tomography ; Mineralization ; Subacromial space
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A reduction of the subacromial space and an increased subacromial pressure have been considered to play an important role in the pathogenesis of rotator cuff lesions. The objective of the current study was to develop a CT based method for measuring the acromiohumeral distance and inferior acromial mineralization. In seven patients with unilateral rupture of the rotator cuff and two with impingement syndrome, transverse CT images were obtained at a section thickness of 1 mm with muscular relaxation in a standardized position. The bones were then reconstructed three-dimensionally, and the minimal vertical distance between the acromion and the humerus was determined in three secondary frontal images on both sides. The distribution of mineralization within the inferior surface of the acromion was assessed using CT osteoabsorptiometry. Although the Constant score was significantly reduced in the diseased shoulders, the width of the subacromial space was not routinely lower than on the contralateral side. In seven cases the maximal inferior acromial mineralization was identical in both shoulders, and in two cases it was lower on the affected side. These preliminary data suggest that with muscular relaxation no narrowing of the subacromial space can be detected in secondary frontal CT images, and that a potential increase of subacromial pressure is not high enough to cause a measurable increase in inferior acromial bone density. The method presented makes it possible to investigate the pathogenesis of the supraspinatus outlet syndrome in vivo with greater precision than has so far been possible with conventional radiography.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1433-044X
    Keywords: Key words Supraspinatus outlet syndrome ; computed tomography ; 3D reconstruction ; shoulder ; acromion ; Schlüsselwörter Supraspinatus-outlet-Syndrom • CT • 3D-Rekonstruktion • Schulter • Akromion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine mechanische Irritation der Supraspinatussehne aufgrund einer Einengung des subakromialen Raumes wird als mögliche Ursache des Supraspinatus-outlet-Syndroms angesehen. Ziel der vorliegenden Studie war die Entwicklung einer Methode zur verbesserten räumlichen Messung akromiohumeraler Distanzen und zur Beurteilung der Akromionform in der dreidimensional rekonstruierten Computertomographie (CT). An 7 Patienten mit einseitigem Supraspinatus-outlet-Syndrom wurde das Akromion und der subakromiale Raum aus hochauflösenden CT-Schnitten dreidimensional (3D-) rekonstruiert. Die akromiohumerale Distanz wurde in 3 rekonstruierten Frontalschnitten gemessen und auf der gesunden und erkrankten Seite verglichen. Die Akromionform wurde der Klassifikation nach Bigliani im konventionellen Röntgenbild gegenübergestellt. Die akromiohumerale Distanz war an der betroffenen Schulter nicht signifikant kleiner als auf der gesunden Seite. In 5 Fällen konnte die Klassifikation der Akromionform im Röntgenbild in der 3D-CT bestätigt werden, in 2 Fällen ergab sich eine abweichende Beurteilung. Die Ergebnisse legen nahe, daß mit der 3D-CT eine verbesserte Beurteilung der Akromionform und der akromiohumeralen Distanz möglich ist.
    Notes: Summary Mechanical irritations of the supraspinatus tendon due to a reduction of the subacromial space are considered to be a potential cause of supraspinatus outlet syndrome. The aim of the current study was, therefore, to provide a method of improved measurement of the acromiohumeral distance and the evaluation of the acromial shape. In seven patients aged 50–60 years with unilateral supraspinatus outlet syndrome, imaging with standardized, high-resolution computed tomography (CT) was performed in order to demonstrate the acromion and the subacromial space three-dimensionally. The acromiohumeral distance was measured in three reconstructed frontal sections, and the two sides of each patient were directly compared. The acromial shape was compared with the classification of Bigliani as derived from conventional radiography. Whereas the Constant Score was found to be significantly reduced in the diseased shoulders (p 〈 0.01), the acromiohumeral distance was not significantly lower in three standardized frontal sections. In five cases the classification of the acromial form from the conventional radiograph was confirmed by 3D CT, whereas in two cases it was shown to be different. Our results suggest that primary or secondary changes of the acromial form can be more accurately evaluated with 3D CT than with conventional radiography. A direct comparison of the two sides in patients with supraspinatus syndrome does not suggest a reduction of acromiohumeral distance in the diseased shoulder.
    Type of Medium: Electronic Resource
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