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J Y Barbin

Publications and source records attributed to J Y Barbin.

At least 37 records · Page 2Linked to original sources
PubMed1987

A physico-mathematical model for the human femur, with and without a prosthesis, under the static constraints of one-legged stance.

The authors present a physico-mathematical model of a human femur, under "monopodal" static constraints, using the finite elements method. Three examples are considered: a normal femur, a femur implanted with a short-stem prosthesis without cement, and a femur implanted with a long-stem prosthesis without cement. The lines of isoconstraints were compared in the three examples, as well as the main constraints (direction and intensity). From the results, the authors suggest that a prosthesis made of titanium is currently best even though its YOUNG's modulus differs from that of the bone. A prosthesis of composite material is possible in the future. While the intensity of the constraints is nearly the same at the level of the epiphysis for the short-stem and long-stem prosthesis it seems that the short-stem prosthesis fitted accurately without cement is the best solution. The introduction of a hip prosthesis modifies the normal curve of the loaded femur by changing the center of this curve.

Biomechanical Phenomena↗
PubMed1987

[The caudal lobe of the liver. Anatomical study. Surgical applications].

The caudal lobe of liver is an independent sector astride the right and left liver regions. It is formed of two parts, right and left, distinguished exteriorly by the caudal and papillary processes, and can now be explored (ultrasound and CT imaging) allowing its surgical removal (tumoral lesion of the superior biliary confluent).

Humans↗
PubMed1986

Spleno-gonadal fusion: anatomic and angiographic study of a case.

The authors report a case of spleno-gonadal fusion in which the advantage of an angiographic study permitted, for the first time, an analysis of the vascularization of this malformation. The embryologic study explains the malformations associated with the continuous type of spleno-gonadal fusion.

Child, Preschool↗
PubMed1985

Radiological anatomy of the bile ducts based on intraoperative investigation in 250 cases.

Intraoperative cholangiograms were studied in 250 patients. Analysis of the data obtained led to the establishment of a protocol for intraoperative cholangiography aimed at identification of anatomical anomalies and variations. Diagnosis of the latter must be achieved in order to avoid possible intraoperative complications. The common hepatic duct was formed by the junction of the right and left hepatic ducts in 52% of the cases studied. Absence of convergence of the posterior and anterior rami of the right hepatic duct was found in 30% of cases. Anatomical variations of the right sectorial duct system were seen in 12% of cases. Conversely, variations of the left sectorial duct system were rarely seen (2% of cases). Careful examination of the intraoperative cholangiograms led us to suspect certain anatomical variations in close to 1% of cases. These variations included abnormal hepatocystic duct, which if undiagnosed could lead to choleperitoneum or inadvertent ligation of the right hepatic duct. An abnormal hepatocystic duct terminating on the gall bladder was found in one patient. Study of the origin of the common bile duct allowed us to define the mode of termination of the cystic duct (on the right margin of the common hepatic duct in 80% of cases) and to identify a short choledochus in 2% of cases. Finally, variations of the duodenal termination of the common bile duct were studied and reflux into the pancreatic duct was seen in 27% of cases. However, the pathological significance of such reflux was rarely found.

Bile Ducts↗
PubMed1984

The mandible, an overhanging mechanically suspended structure. Considerations on the system of attachment and servo-command of the mandible.

The mandible, owing to its form, surrounding muscles and "position" in the craniofacial unit can be assimilated to an overhanging mechanically suspended structure. The hypothesis, according to which the temporomandibular joints would be submitted to pressure during mastication should be abandoned on the basis of anatomical and clinical findings. Furthermore, this hypothesis is in disagreement with the results of simulation on a physicomathematical model of the mandible. Accordingly, it is reasonable to assume that the mandible is a suspended structure and that the elevator muscles of mastication, especially the masseter and medial pterygoid (together forming the mandibular sling), and probably also the anterior belly of the temporalis muscle play a twin role in the suspension of this bone. These muscles obviously command the movement of closure. They also constitute the suspensory apparatus of the mandible and, by mechanical computation, should display a certain degree of elasticity and undergo most of the mechanical constraints developed during mastication. One can also consider the cranio-facio-mandibulo-hyoid group as a suspended structure. The comparison of this type of system to the basic principles of servo-robotics allows to understand that such a structure is capable of extremely precise movements in all spatial planes with a minimum of effort.

Biomechanical Phenomena↗
PubMed1984

A physicomathematical approach to the structure of the mandible.

Classical methods of anatomical study and experimentation have reached an endpoint with respect to the advancement of our knowledge of certain aspects of bone, i.e. its mechanical properties, investigation of the constraints acting on bone and the organization of bone allowing resistance to such mechanical stress. Indeed, current knowledge is rather limited regarding bone as a material. Furthermore, bone from the cadaver cannot be considered a reliable source of study material since its physicochemical composition and mechanical properties are highly different from those of living bone. The types of experimentation used to date, although allowing to study the phenomena occurring on the surface of the bone, do not allow to evaluate those that occur within the bone without modification of its mechanical features. Finally, the number and complexity of the parameters to be taken into account in this respect largely supersede the possibilities of classical study techniques. Accordingly, new types of methodology are required to evaluate the many parameters involved, to perform the corresponding computations and resolve the great number of unknown variables. Such methodology must allow experimentation to be performed without modifying the object of study and to determine the phenomena occurring within the bone itself, i.e. the mandible. A method of computer assisted simulation of a physicomathematical model was used to analyse the structural properties of the mandible.(ABSTRACT TRUNCATED AT 250 WORDS)

Biomechanical Phenomena↗
PubMed1983

[Cancer of the vulva. Diagnostic and therapeutic aspects apropos of a series of 90 cases].

The authors present a series of 90 cases of cancer of the vulva of which 10 were intra-epithelial and 80 were invasive. These were studied from the 1st January 1962 through to the 31st December 1980. The mean age was 70.04 years, the range being from 31 to 92 years of age. Most cases however were between the ages of 70 and 80. 37.7% of the patients were debilitated. The condition was brought to notice by the discovery of a tumour in 48.8% of the cases, the onset of pruritus in 20% of cases and pain in 14.4%. Most of the tumours were found on the labia majora and minora (in 52.2%). FIGO classification was of stage I in 12% of cases, stage II in 26.6%, stage III in 33.3% and stage IV in 28%. The methods for treating these conditions have been shown according to whether the tumour was intra-epithelial or invasive. Analysing the results confirms that this kind of cancer has a poor prognosis: 57.6% of survivors after 2 years but only 37.3% after 5 years (an actuariel calculation). 30 cases of relapses were analysed and also the complications that occurred. Among these were most frequently (25%) lymphocoeles, sutures falling out because of necrosis and infection (34.2%), urinary incontinence (35.2%). The circumstances in which the patients died were determined above all by the way the disease evolved locally, but in 13.3% of the cases there was metastatic disease. Finally, the difficulties of the diagnosis and of the definition of micro-invasive cancer of the vulva are commented on. The authors point out that the prognosis depends as much as anything on the amount the lymphatics are involved, the frequency and the problems of therapy that are posed by urinary incontinence which occurs after operation. They then give their ideas for treating the patients.

Adult↗
PubMed1976

[External morphology of the roe deet (Capreolus capreolus L)].

The results of a morphological study of the cerebellum of the roe-deer are given. The structural simplicity of Lobus Rostralis, the relatively small development of Lobulus Ansiformis fully agree with previous works on the pattern of the cerebellum in Ungalata.

Animals↗