Hip joint prosthesis using electro-stimulation - has cement between ball and stem, and negative connection to stem with plate and screws

摘要

The hip joint prosthesis which is assisted by electro stimulation by means of a positive connection (7) on the ball portion and a negative connection (6) near the femur (4) has a ball joint consisting of a spherical headed portion (1) and a stem portion (2) the latter being inserted down the femur, with a gap between the inside of the spherical part and the spigot (8) on the top of the stem part, which is filled with a cement (3), the two parts being made of a cobalt/nickel/chromium/molybedenum alloy. The negative connection is made on a plate (5) through a pair of screws (5a) passing through it, in contact with the stem (2).