[Biomechanic considerations in wrist prostheses].
At the present time, in disorders of the wrist, avulsion of the first carpal row is the most commonly used technique as a last resort. However, there are many wrist prostheses, which are reviewed here. Roughly, they belong to two families: the three axis prostheses (spherical) that cannot transmit to the hand the pronation supination torque, because of their geometrical characteristics, and the two axis prostheses (universal joint) that are able to transmit this movement. The characteristics of future prostheses must include: based on the "universal joint" principle, occupy minimum space, isometric, maintain tendon tension, an axis identical to the true axis of the wrist, to maintain the hand in line with the forearm, fixed without cement but, not shortened with time, possibilities of mechanical flexibility immediately and lastingly stable, to be easily replaced modularly. This ideal prosthesis will certainly exist one day and will take the place of the first carpal row avulsion. In the meantime, this technique will still have a long use.
D001696:Biomechanical Phenomena; D002985:Clinical Protocols / Q000592:standards; D006801:Humans; D007595:Joint Prosthesis / Q000145:classification / Q000592:standards*; D010027:Osteotomy / Q000592:standards; D011474:Prosthesis Design / Q000592:standards; D016059:Range of Motion, Articular; D014955:Wrist Joint / Q000503:physiopathology / Q000601:surgery*
Considérations biomécaniques sur les prothèses de poignet.