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Biomedical subjects

Y Mazas

Publications and source records attributed to Y Mazas.

5 recordsLinked to original sources
PubMed1986

[Total radiocarpal prosthesis. Preliminary study].

The mechanical requirements before satisfactory muscular balance in a total wrist prosthesis have been studied in 25 cadavers. The centre of rotation was determined in X-Rays; it was localised in the sagittal plane crossing the axis of the forearm and in the frontal plane situated in front of the axis of the forearm. A graphic model of the wrist was then established. A total prosthesis was then designed, made up of two components with a torus surface. This prosthesis was found to be compatible with the wrist model. Movement required forces only slightly greater than normal muscular activity. One male was operated on using this prosthesis. The result was satisfactory after one year.

Adult↗
PubMed1982

A radiological study of the wrist centers of rotation.

To ensure the total replacement of wrist, it seems necessary to determine the main kinematic specifications of mobility and stability of this joint. After a review of the literature, the authors have determined, by the classical X-rays graphic method, the positions of both radial-ulnar deviation and flexion-extension centers, on 26 alive normal wrists. The data, in some ways different from Youm's, introduce to the conditions of stability of any wrist in a functional situation. The center locus (on the forearm axis in a front view, quite anterior in a lateral view) is, in some ways, an answer to the question of muscular equilibrium during prehensile efforts, so to the amount of strains the joint must bear, and consequently to the design of a total wrist prosthesis.

Adult↗
PubMed1975

[A computer-directed measuring device to analyse pathological gaits].

The clinical observation of the walk is still the only current way to define the limp, but is obviously quite a rough valuation. Taking advantage of previous studies and recent improvements in electronics, the authors have built a measuring unit-including a computer-designed for daily clinical use. This unit provides in a few minutes the variations of the ground reaction to the human body during the walk, and the displacement of the point to which this reaction is applied. Seven to ten patients per hour may be examined, including previous analysis of the results by the computer.

Computers↗