Search PubMed⌕ Search

Biomedical subjects

F Bonnel

Publications and source records attributed to F Bonnel.

At least 127 records · Page 7Linked to original sources
PubMedDate not supplied

CT angiography of thoracic outlet syndrome: evaluation of imaging protocols for the detection of arterial stenosis.

PURPOSE: The purpose of this work was to evaluate the results of cross-sectional imaging and multiplanar and 3D reconstructions for the detection of thoracic outlet arterial stenosis on CT angiograms. METHOD: Eighty-two patients were prospectively evaluated with CT angiography: in the neutral position and after postural maneuver (164 acquisitions); with contralateral injection of a 24% (Group 1; n = 68) or 30% (Group 2; n = 96) contrast agent; and reconstruction of four sets of images from each acquisition, that is, transverse CT scans, sagittal reformations, and 3D [shaded surface displays (SSD) and volume-rendered (VR)] images. A total of 656 sets of images were blindly and independently interpreted by three readers of variable experience. A consensus interpretation of the four sets of images of each acquisition was used as a standard of reference. RESULTS: The number of examinations coded with an excellent degree of arterial enhancement was significantly higher in Group 2 than in Group 1 [68 (71%) vs. 35 (51%); p < 0.001]. The sensitivity and specificity for detection of arterial stenosis were 67 and 96% for transverse CT scans, 69 and 94% for sagittal reformations, 71 and 99% for 3D-SSDs, and 95 and 100% for VR images. Compared with the standard of reference, a concordant scoring of arterial stenosis severity was found in 54% of transverse CT scans, 84% of sagittal reformations, 78% of 3D-SSDs, and 91% of VR images. Underestimation of stenosis was found in 43% of transverse CT scans and 10% of sagittal reformations; overestimation of stenosis was more frequent on 3D-SSDs (16%) than on VR images (7%). The reader's experience was marked for the interpretation of cross-sectional images but did not influence the interpretation of 3D images. CONCLUSION: Thoracic outlet arterial compression is best depicted with the injection of a 30% contrast agent and reconstruction of VR images.

Adolescent↗
PubMedDate not supplied

[Arthrodesis of the sub-occipital spine by screwed occipito-cervical plate. Clinical case and technical notes].

The authors report a new technique in arthrodesis of the sub-occipital spine which has been experienced since 1973 in case of metastases at CI-C2 level. An occipitovertebral metal plate, inverted Y shaped has been realised after anatomical and biomecanical studies. It is adapted to the occipito-vertebral curvature and screwed in the articular processes of C3 and C4 (14 mm screw), and in the pedicles of C2 (32 mm screw). At the upper part, the occiptal ridge offers fixation by 12 and 14 mm Muller's screw. In addition CI is attached to the plate, by a nylon thread. After the report of the first clinical case with a nine month period of follow up technical features of the material as well as practical problems are exposed. Tomograms of the cervical spine as well as bilateral brachial angiography are of paramount value. The latter investigation may reveal anomalies of the vertebral artery that can hinder of forbid the pedicular fixation. Finally the authors discuss the extension of this technique to complexe trauma of the suboccipital column.

Arthrodesis↗
PubMedDate not supplied

[Ender's flexible nail. Theoretical and biomechanical study. Technic, indications and results in the treatment of cervico-trochanteric fractures].

The authors describe the Ender's technique in the treatment of fractures of the trochanteric region. They realise a blind nailing, introducing "elastic" nails in the region of the medial condyle, under Xray control. The authors have conducted a biomechanical study comparing this type of nailing with nail-plating (extensometry and mathematical theory). 51 patients were operated-on. The results are analysed. The authors point out that the surgical procedure is very fast and simple, therefore they support it for aged people.

Aged↗