Proportion (95% CI) that achieved net benefit from TKA at 1 year post TKA
| Definition of net benefit from TKA | Proportion achieved (95% CI) |
| OMERACT–OARSI responder criteria (modified) | |
| a) PGA knee pain much or somewhat improved | 93.5 (91.95 to 94.9) |
| b) ≥20% improvement in WOMAC Pain Score | 94.1 (92.7 to 95.5) |
| c) ≥20% improvement in KOOS-PS | 85.3 (83.1 to 87.4) |
| d) Absolute change in WOMAC Pain Score≥2/20 | 95.8 (94.6 to 97.0) |
| e) Absolute change in KOOS-PS≥10/100 | 83.3 (81.0 to 85.5) |
| Met all the above criteria (a–e), indicating treatment response* | 79.5 (76.9 to 81.9) |
| Overall satisfaction with TKA results | |
| Very satisfied | 74.7 (72.1 to 77.4) |
| Somewhat satisfied | 16.7 (14.5 to 19.0) |
| Somewhat or very satisfied | 91.45 (89.8 to 93.1) |
| Somewhat or very dissatisfied | 8.55 (6.9 to 10.4) |
| OMERACT–OARSI and somewhat/very satisfied | 78.1 (75.4 to 80.5) |
*Each of the five Outcome Measures in Rheumatology and Osteoarthritis Research Society International (OMERACT–OARSI) criteria (a–e) were assessed individually; those who met all the criteria were considered to have responded to the treatment (TKA).
KOOS-PS, Knee injury and Osteoarthritis Outcome Score physical function short-form; PGA, patient global assessment; TKA, total knee arthroplasty; WOMAC, Western Ontario-McMaster Universities Osteoarthritis Index.