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Table 1 Outcome scores of the total study group, the non-failed group, and clinical failures (patients not achieving MCID for WOMAC total or VAS pain at 24 months)

From: Preoperative patellofemoral anatomy affects failure rate after isolated patellofemoral inlay arthroplasty

  Total study group Non-failed Clinical failures
VAS pain preoperative 5.6 ± 2.0 6.2 ± 1.8 4.0 ± 1.4b
VAS pain 24 months 2.9 ± 1.9a 2.6 ± 2.1a 3.8 ± 0.9b
VAS pain delta 2.6 ± 2.2 3.6 ± 1.9 0.2 ± 0.8b
WOMAC total preoperative 67.8 ± 13.6 65.7 ± 14.3 73.5 ± 10.2
WOMAC total 24 months 79.0 ± 15.3a 83.2 ± 13.4a 67.9 ± 14.9b
WOMAC total delta 11.2 ± 19.1 17.6 ± 17.7 −5.5 ± 11b
WOMAC pain preoperative 64.9 ± 18.6 60.8 ± 18.7 75.0 ± 14.5 b
WOMAC pain 24 months 82.0 ± 15.4a 85.4 ± 15.5a 73.5 ± 12.0b
WOMAC pain delta 17.1 ± 22.2 24.6 ± 20.1 −1.5 ± 15.8b
WOMAC stiffness preoperative 59.3 ± 22.1 56.5 ± 23.1 66.3 ± 18.7
WOMAC stiffness 24 months 70.4 ± 22.1a 76.0 ± 18.7a 56.3 ± 24.5b
WOMAC stiffness delta 11.1 ± 31.1 19.6 ± 27.9 −10.1 ± 29.6b
WOMAC function preoperative 69.8 ± 14.1 68.2 ± 15.2 73.7 ± 10.4
WOMAC function 24 months 78.9 ± 15.8a 83.4 ± 13.9a 67.6 ± 15.1b
WOMAC function delta 8.4 ± 19.2 14.2 ± 19.1 −6.1 ± 9.2b
Lysholm preoperative 41.2 ± 18.2 40.2 ± 18.6 43.9 ± 17.8
Lysholm 24 months 65.3 ± 20.4a 69.1 ± 20.3a 55.3 ± 18.0b
Lysholm delta 24.0 ± 20.0 28.9 ± 21.2 11.4 ± 7.5b
  1. Patients undergoing conversion to total knee arthroplasty were excluded from data analysis
  2. Values are shown as mean ± standard deviation
  3. MCID minimal clinically important difference, VAS Visual analog scale, WOMAC Western Ontario McMaster Universities Osteoarthritis Index
  4. aStatistically significant improvement compared to preoperative (p < 0.05)
  5. bStatistically significant difference compared to “non-failed” (p < 0.05)