Early Implant Failure and Mal-positioning of Femoral Components
Follow-up studies of Metal on Metal(MoM) hip resurfacings have shown that some of the reasons for early implant failure are:
- Mal-orientation of the implant stem in relation to the femoral neck axis.
- Notching of the femoral neck during femoral head preparation.
- Exposed cancellous bone after implantation.
Calculating the true centre of the femoral neck in both antero-posterior (AP) and lateral planes is imperative in hip resurfacing surgery. This point of reference allows the surgeon to precisely position the femoral neck stem down the femoral neck. If this is not achieved, and mal-positioning of the femoral component occurs, early implant failure can result.
Read more about this topic: Femoral Neck Targeting
Famous quotes containing the words early, implant, failure and/or components:
“Quintilian [educational writer in Rome around A.D. 100] thought that the earliest years of the child’s life were crucial. Education should start earlier than age seven, within the family. It should not be so hard as to give the child an aversion to learning. Rather, these early lessons would take the form of play—that embryonic notion of kindergarten.”
—C. John Sommerville (20th century)
“A cynic might conclude that the real purpose of the $500 million-a-year implant business is the implantation of fat in the bellies and rumps of underemployed plastic surgeons.”
—Barbara Ehrenreich (b. 1941)
“Scientific method is the way to truth, but it affords, even in
principle, no unique definition of truth. Any so-called pragmatic
definition of truth is doomed to failure equally.”
—Willard Van Orman Quine (b. 1908)
“Hence, a generative grammar must be a system of rules that can iterate to generate an indefinitely large number of structures. This system of rules can be analyzed into the three major components of a generative grammar: the syntactic, phonological, and semantic components.”
—Noam Chomsky (b. 1928)