Table 3. Summary of Level 1–2 Studies Comparing the Outcomes of CR and PS Total Knee Arthroplasty.
| Study | Level | Number (CR/PS) | Prosthesis | FU (yr) | Clinical evaluation |
|---|---|---|---|---|---|
| Kim et al.41) | I | 250/250 | NexGen CR flex vs. Legacy knee PS flex | 2.3 | KS and FS, HSS, WOMAC, ROM non-weight bearing & weight bearing |
| Seon et al.43) | I | 48/47 | NexGen CR flex vs. Legacy knee PS flex | 2.3 | HSS, WOMAC, ROM non-weight bearing & weight bearing |
| Cho et al.39) | II | 51/51 | Triathlon & PFC Sigma | 0.5 | KS and FS, ROM, quadriceps force in dynamometer |
| Thomsen et al.44) | I | 36/36 | AGC vs. NexGen Legacy knee PS flex | 1 | VAS (pain, satisfaction, feel), SF-36, ROM active & passive |
| Matsumoto et al.42) | II | 19/22 | NexGen CR flex vs. Legacy knee PS flex | 5 | KS and FS, laxity, ROM |
| Harato et al.40) | II | 99/93 | Genesis II CR vs. PS | 5–7.3 | KS and FS, WOMAC, SF-12, ROM, radiolucency, complication |
| Yagishita et al.45) | II | 29/29 | NexGen CR flex vs. Legacy knee PS flex | 5 | KS and FS, VAS, patient satisfaction score, ROM, radiolucency |
CR: cruciate-retaining, PS: posterior-stabilized, FU: follow-up, KS: Knee Society Knee Score, FS: Knee Society Function Score, HSS: Hospital for Special Surgery score, WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index, ROM: range of motion, VAS: visual analog scale, SF-36: 36-Item Short Form Health Survey, SF-12: 12-Item Short Form Health Survey.