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The percent of patients undergoing (A) primary THA (A) and (B) primary TKA stratified by age who had revision surgery is shown (closed squares = 65–69 years old; closed circles = 70–74 years old; no symbol = 75–79 years old; open squares = 80–84 years old; open circles = 85+ years old). Younger patients had a higher risk of revision.
