Because of theoretical as well as practical difficulty in the total hip endoprostheses available to orthopaedic surgeons at the present time, an anlysis of the present and potential difficulties reveals that substitution of a roller-bearing for the present slider-bearing prosthesis and the establishment of a larger end-bearing surface on the acetabular side would be of benefit. Thus, the Ring prosthesis was re-designed to satisfy these hopes. A modification of the Ring's approach gives complete acetabular exposure and control of the prosthetic insertion. This is a preliminary report describing the design modifications of a prosthesis, presently under investigation, and illustrated by a typical case.
Frost, H. M. and Guise, E. R.
"A Replacement Prosthesis For the Hip: A Preliminary Report,"
Henry Ford Hospital Medical Journal
: Vol. 19
Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol19/iss1/2