Aseptic Loosening of Cemented Total Arthroplasties of the Hip in Relation to Positioning of the Prosthesis:<i>New Utilization of the Tschuprow-Cramer Statistical Test</i>

Abstract

A statistical study of 1200 McKee-Farrar cemented total prostheses of the hip demonstrated the importance of a horizontal position of the cup and a valgus position of the prosthetic stem, in avoiding aseptic loosening of the prosthetic parts. A new test (the Cramer test) showed that a statistical bond exists between the position of the prosthesis and the occurrence of aseptic loosening.