What must be a well-cemented prosthesis?

To avoid cement stem debonding of the Charnley prosthesis, I modified in 1972 the geometry of this prosthesis to subject the cement only to stresses it can resist and protect it against harmful stresses. This was done by giving the stem such a shape that the stresses within the cement would be decreased to a level consistent with its physical properties. On the acetabular size, there has been no modification of the Charnley acetabular component, I only specified how to prepare the acetabulum and implant the socket in order to make it in mechanical harmony with the bone cavity.