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J Senegas

Publications and source records attributed to J Senegas.

At least 37 records · Page 2Linked to original sources
PubMed1989

[Radiologic change of cartilage of the pelvis and the upper end of the femur during growth. Application to the surveillance of scolioses].

We retrospectively studied the radiographic documents of seventy girls with bony age varying from nine to eighteen years old and divided in nine equal groups and seventy boys with bony age from ten to nineteen years old. We analyzed the AP pelvic X ray of each child focusing on cartilages and ossification centers of both pelvic bone and upper femoral extremity. The purpose of this study was to assess the dates of apparition and ossification of these ossification centers and the dates of fusion of cartilages. The iliac ossification center (epiphysaris nucleus ilii) appears lately at bony age of thirteen years and half for girls and fourteen years and half for boys. The triradiate cartilage closes the earliest from its medial to its lateral portion before the apparition of the iliac ossification center. This closing date corresponds to the beginning of growth acceleration. Therefore, the period of growth acceleration can be identified by an accurate analyse of the triradiate cartilage closure on a single AP pelvic X ray.

Adolescent↗
PubMed1988

CT-diskography in the evaluation of the postoperative lumbar spine. Preliminary results.

Thirty-three patients with recurrent sciatica after lumbar-disk surgery were studied for recurrent herniated nucleus pulposus (HNP) by CT alone and CT-diskography (CTD). Twenty-six patients underwent surgical reexploration allowing correlation with CTD. CTD made a correct diagnosis of recurrent HNP in twenty-one patients showing an extravasation of the contrast medium from the disk space into the medullary canal. In two cases CTD was positive for recurrent HNP but surgery showed only fibrosis. The amount of contrast leak was very small in these two cases along the posterior common longitudinal ligament, and the junction with the disk was very narrow. Because of their clinical presentation three patients with negative studies were operated upon. One showed only fibrosis and the two others showed an associated disk fragment. Among the twenty-one true-positive cases, seven showed a combination of recurrent HNP and scarring. Contamination of CSF by the contrast medium through the dura was observed in two patients. Although a prospective comparative study between CTD and IV-contrast-enhanced CT is necessary, CTD appears to be a useful diagnostic procedure for recurrent HNP after surgery of the lumbar spine.

Adult↗
PubMed1988

[Recalibration of the lumbar canal, an alternative to laminectomy in the treatment of lumbar canal stenosis].

A technique is described for widening the lumbar vertebral canal in the treatment of lumbar stenosis. This method, which preserves part of the posterior arches, has the aim of avoiding the instability which accompanies extensive laminectomies of the whole lumbar spine. The preservation of the posterior arches allows a ligamentoplasty to be made with dacron in stable spines and a combined fusion with internal fixation applied to the posterior arches to be made in cases of spondylolisthesis. The results of a prospective series of 32 patients have confirmed the effectiveness of the method both on the stenosis and on the post-operative spinal stability.

Adult↗
PubMed1986

Anatomical bases of the study of the constraints to which the cervical spine is subject in the sagittal plane. A study of the center of gravity of the head.

The authors have determined the position of the center of gravity of six isolated formolized heads by the suspension method, based on the work of the Bordeaux anthropologist, Beauvieux; in his opinion, the nasion-opisthion line (root of nose to posterior edge of the foramen magnum) characterizes the horizontality of the head, irrespective of species. The center of gravity is situated at the middle of the nasion-inion line (root of nose to external occipital protuberance), behind the sella turcica, above and slightly in front of the external auditory meatus. In profile, the axis of gravity falls on leaving the center of gravity and passes in front of the cervical spine, which remains in balance thanks to a fulcrum lever whose two arms are equal when the gaze is directed 30 degrees downwards in relation to the horizontal. This is the true reference position for the cervical spine in the sagittal plane.

Cervical Vertebrae↗
PubMed1985

[Extended spinal decompression using an anterior approach in the treatment of myelopathies caused by cervical arthrosis].

Forty-five patients suffering from severe myelopathy due to cervical spondylosis with stenosis of the spinal canal were treated by anterior decompression extending over three levels or more. In eight instances, the decompression was the only surgical procedure: in 37 instances, there was associated bone graft. No severe complications were noted. The clinical results were assessed, using the Nurick scale. The average follow-up was four years. No patient was made worse. Twelve were completely relieved, 21 were improved and 12 were unchanged. The authors conclude that this technique is worthwhile. Grafting should be done only in cases where there is post-operative instability. After a review of the literature, the authors conclude that anterior resection of the vertebral bodies is more reliable than extensive laminectomy.

Adult↗
PubMed1983

Anatomy of the lumbar radicular canal.

The radicular canal is defined as the lateral part of the spinal canal containing the spinal nerve root from its point of emergence through the dural envelope up to and including the intervertebral foramen. The radicular canal, resembling a hollow hemicylinder opened towards the midline, can be divided into three parts, i.e. retrodiscal, parapedicular (the lateral recess per se) and foraminal. The different walls of the canal (notably those of the lateral recess) are described. A review of the main types of roentgenographic exploration of the radicular canal are presented based on these anatomical findings. Finally, this static description of the typical lumbar radicular canal and its variations according to the lumbar or sacral level under consideration is followed by a presentation of the modifications which arise in the upright position and during extension and flexion of the lumbar spine.

Humans↗
PubMed1983

An approach to the functional anatomy of the sacroiliac joints in vivo.

This first part of this paper is a review of the literature on the functional anatomy of the sacroiliac joint followed by a preliminary biomechanical study of the fresh post mortem pelvis. The latter was done in order to determine the coefficients of the screw matrix and the position of the instantaneous centers of rotation during the symmetrical movements of nutation and contranutation simulated in the biomechanics laboratory. The main part of this work deals with the spatial analysis in vivo of the relative displacements of the iliac bones with respect to the sacrum in the course of dissymmetrical movements of the pelvis. In the different phases of movement, the roentgenographic observation of the position of the bony components with respect to a three-dimensional orthonormal reference system required the use of material based on the principles of photogrammetry. This technique was used to achieve spatial reconstruction of the data recovered from a series of orthogonal x-ray films of the sacroiliac joints. Data retrieval was carried out on a digital table linked to a computer with a graphic terminal so that the information could be displayed in the form of rectangular coordinates of defined points on the bone. Owing to the limited amplitude of articular displacement, a statistical study was required to retrieve the coordinates from the projection of these points on the X-ray film with an estimated threshold of significance of 0.1 and an error of +/- 0.1 mm.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1982

[Scanography and chemonucleolysis of herniated discs. Value and limitations in 20 cases].

Scanography explorations were conducted before and after chemonucleolysis in 20 patients with sciatica from herniated discs. The scanner can improve the selection of patients for this new type of medical treatment by detecting adverse factors: stenosed discs, excluded hernias, narrow canals, stenosis of the lateral recesses. The diagnostic precision of scanography can be demonstrated by comparison of results with those obtained by discography. Following chemonucleolysis, however, intravenous injection of a contrast medium and a high resolution programme are necessary to obtain specific information from scanography.

Chymopapain↗
PubMed1980

Complex acetabular fractures: a transtrochanteric lateral surgical approach.

Open surgery is recommended for complex fractures whenever primary conservative treatment fails to satisfactorily reduce the femoral head and the weight-bearing dome of the acetabulum. Surgical exposure has been a major problem in attempting open reduction of these fractures. The classification of acetabular fractures noted above is a useful guide to the indications for open operation. A transtrochanteric lateral approach provides a good extra and intraarticular access to the acetabulum. The excellent clinical results achieved in 28 cases of complex acetabular fractures with a mean of 5.7 year follow-up testify to the value of this approach.

Acetabulum↗