Pioneered by Sir John Charnley in the 1960s, hip and knee replacement surgery has offered a markedly improved quality of life to thousands of people who would otherwise have had their mobility severely limited. Since 1996 the rate of persons receiving total hip replacement has increased by 52% and the rate of those receiving total knee replacement has more than doubled.
Data from the Hospital Discharge Survey document the increasing number of these surgeries is here.
NCHStats 
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Idetrorce