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Table 3 Ceiling and floor effects within 12 months after total knee arthroplasty

From: Forgotten Joint Score for early outcome assessment after total knee arthroplasty: Is it really useful?

  FJS, % (n) WOMAC, % (n) P value
Ceiling
 3 months (n = 84)
  Maximum 1.2 (1) 0 (0) 1
  Highest 10% 2.4 (2) 7.1 (6) 1
  Highest 15% 7.1 (6) 11.9 (10) 0.148
 6 months (n = 56)
  Maximum 5.4 (3) 1.8 (1) 0.045*
  Highest 10% 10.7 (6) 16.1 (9) 0.046*
  Highest 15% 19.6 (11) 32.1 (18) 0.027*
 12 months (n = 23)
  Maximum 8.7 (2) 8.7 (2) 0.170
  Highest 10% 13.0 (3) 30.4 (7) 0.209
  Highest 15% 26.1 (6) 39.1 (9) 0.162
 Total (n = 163)
  Maximum 3.1 (5) 1.8 (3) 0.003*
  Highest 10% 6.7 (11) 13.5 (22) 0.001*
  Highest 15% 14.1 (23) 22.7 (37) <0.001*
Floor
 3 months (n = 84)
  Minimum 6.0 (5) 0 (0) 0.061
  Lowest 10% 16.7 (14) 0 (0) <0.001*
  Lowest 15% 21.4 (18) 0 (0) <0.001*
 6 months (n = 56)
  Minimum 5.4 (3) 0 (0) 0.248
  Lowest 10% 10.7 (6) 0 (0) 0.030*
  Lowest 15% 10.7 (6) 0 (0) 0.030*
 12 months (n = 23)
  Minimum 0 (0) 0 (0) 1.000
  Lowest 10% 4.3 (1) 0 (0) 1.000
  Lowest 15% 13.0 (3) 0 (0) 0.248
 Total (n = 163)
  Minimum 4.9 (8) 0 (0) 0.007*
  Lowest 10% 12.9 (21) 0 (0) <0.001*
  Lowest 15% 16.6 (27) 0 (0) <0.001*
  1. Abbreviations: FJS Forgotten Joint Score, WOMAC Western Ontario and McMaster Universities Arthritis Index
  2. * P <0.05