title: Knee replacement demographics changing rapidly.
mesh_terms: D000367:Age Factors; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000706:statistics & numerical data* / Q000639:trends; D006801:Humans; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000379:methods* / Q000639:trends