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Table 6 Ceiling and floor effects of the KOOS and WOMAC. Percentage of patients reporting best possible score (ceiling effect)/ worst possible score (floor effect).

From: Knee injury and Osteoarthritis Outcome Score (KOOS) – validation and comparison to the WOMAC in total knee replacement

  KOOS WOMAC
  Pain Symptoms ADL Sport/Rec QOL Pain Stiffness Function
Pre-op 1/0 0/1 0/0 0/48 0/14 1/2 2/7 0/0
6 mo 15/0 3/0 8/0 16/16 11/1 27/0 15/0 8/0
12 mo 22/0 12/0 11/0 9/12 17/0 30/0 27/0 11/0