The aim of the study is to evaluate the safety of a new cemented acetabular cup with Vitamin-E-doped PE regarding migration, head penetration and clinical results. Methods and analysis In this single-centre, double-blinded, randomised controlled trial, we will include 50 patients with primary hip osteoarthritis scheduled for. Reactor Vessel Bottom Head Penetration Leakage. The information formerly found on this page is now available on the Reactor Pressure Boundary Integrity Issues for Pressurized Water Reactors page. Page Last Reviewed/Updated Monday, April 29, Background: We examined the relationship between long-term femoral-head- penetration patterns and osteolysis in a ten-year follow-up study of a well controlled patient population. The purposes of this study were to characterize the linearity of long-term head-penetration patterns over time, to describe the relationship.