Table 4.
Results of comparative studies between fixed-bearing conventional posterior stabilised (PS) and high-flexion posterior stabilized (H-F PS) total knee arthroplasty (TKA)
| Author | Year | Country | Study design | Prosthesis design | Number of knees (patients) |
Mean follow-up (years) |
Preop flexion (SD) |
Postop flexion (SD) |
Preop ROM (SD) |
Postop ROM (SD) |
P value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Huang et al. [19] | 2005 | Taiwan | CCS | Nexgen LPS | 25 (25) | 2 | N/S | N/S | 110 | 126 | P < 0.05 |
| Nexgen LPS-Flex | 25 (25) | N/S | N/S | 112 | 138 | ||||||
| Kim et al. [11] | 2005 | South Korea | RCT | Nexgen LPS | 50 (bilateral knee) | 2.1 | N/S | N/S | 126 | 136 | P > 0.41 |
| Nexgen LPS-Flex | 50 (bilateral knee) | N/S | N/S | 127 | 139 | ||||||
| Bin and Nam [16] | 2007 | South Korea | CCS | Nexgen LPS | 90 | 1 | 122.9 (17.0) | 124.3 (9.2) | 115.3 (22.5) | 123.6 (10.4) | P < 0.05 |
| Nexgen LPS-Flex | 90 | 123.3 (13.1) | 129.8 (5.2) | 117.9 (18.8) | 129.4 (5.4) | ||||||
| Weeden and Schmidt [20] | 2007 | USA | RCT | Nexgen LPS | 25 (25) | 1 | 121 | 120 | N/S | N/S | P < 0.05 |
| Nexgen LPS-Flex | 25 (25) | 122 | 133 | N/S | N/S | ||||||
| Ng et al. [12] | 2008 | China | CCS | Nexgen LPS | 35 (35) | 2.9 | 105 (15) | 105 (13) | N/S | N/S | P = 0.201 |
| Nexgen LPS-Flex | 35 (35) | 104 (17) | 106 (14) | N/S | N/S | ||||||
| Nutton et al. [13] | 2008 | Scotland | RCT | Nexgen LPS | 28 (28) | 1 | 107 (15) | 106 (17) | N/S | N/S | NS |
| Nexgen LPS-Flex | 28 (28) | 108 (15) | 110 (17) | N/S | N/S | ||||||
| Laskin [18] | 2007 | USA | CCS | Genesis II PS | 40 (40) | 2 | 116 | 118 | N/S | N/S | P < 0.01 |
| Genesis II PS H-F | 40 (40) | 117 | 133 | N/S | N/S | ||||||
| McCalden et al. [15] | 2009 | Canada | RCT | Genesis II PS | 50 (50) | 2.7 | 114 | 124 (7) | N/S | N/S | P = 0.811 |
| Genesis II PS H-F | 50 (50) | 111 | 123 (7) | N/S | N/S | ||||||
| Malik et al. [14] | 2009 | USA | CCS | Genesis II PS | 50 (50) | 1 | 114.6 (13.4) | 118 (14.1) | 114 (22) | 118 (14.1) | P = 0.43 |
| Genesis II PS H-F | 50 (50) | 115 (21.3) | 120 (12.1) | 115 (21.3) | 124.3 (9.2) |
Nexgen LPS Nexgen Legacy Posterior Stabilized, Nexgen LPS-Flex Nexgen Legacy Posterior Stabilized Flex (Zimmer, Warsaw, IN, USA), Genesis II PS Genesis II Posterior Stabilized, Genesis II PS H-F Genesis II Posterior Stabilized High-Flex (Smith & Nephew, Memphis, TN ,USA), RCT randomised controlled study, CCS case controlled study, N/S not stated, NS not statistically different, SD standard deviation