Charnley prosthesis is a type of hip replacement implant that was developed by Sir John Charnley in the 1960s. It is a highly successful and widely used design that has improved the lives of millions of people suffering from hip joint problems. There are several synonyms for the Charnley prosthesis, including Austin Moore prosthesis, Thompson hip prosthesis, and Freeman hip prosthesis. All of these prostheses are variations of the original design and have their own unique features that make them suitable for different types of hip replacements. Despite being over 50 years old, the Charnley prosthesis remains a gold standard in hip replacements due to its reliability and durability.