Table 1.
Baseline data in comparative studies of various bearing surfaces in hip replacement systems
| Study | Design | Study quality | No of hips (patients) | Date of procedure | Site, surgeon, centre | Mean (SD, range) age (years) | % women | % osteo-arthritis (avascular necrosis) | Mean follow-up (years) | (%) follow-up | Manufacturer |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Metal on polyethylene v metal on metal | |||||||||||
| Dahlstrand, 2009, Sweden27 | Randomised | Moderate | 54 (54) | Oct 1998-Jan 2001 | Single surgeon, single centre | 65 (NA, 40-75) | 50 | 100 (0) | 24 months (22-27) | 100 | Zimmer (previously Sulzer) |
| Engh, 2009, US28 | Randomised | Moderate | 91 (91) | Oct 2003-Oct 2005 | NA | NA (40-80) | NA | NA | NA (6 months-2 years) | 86 | DePuy Orthopaedics |
| Jacobs, 2004, US40 | Randomised | Moderate | 171 (171) | March 1997-July 2000 | Multi-surgeon, multicentre | 54.4 (NA) | 43 | 66 (20) | 43 months | 72 | Johnson & Johnson |
| MacDonald, 2003, US36 | Randomised | Moderate | 41 (41) | March 1998- Nov 1999 | Multi-surgeon, multicentre | NA | NA | NA | 3.2 (2.2-3.9) | 98 | BioMet |
| Zijlstra, 2009, Netherlands29 | Randomised | Moderate | 200 (195) | NA | Multi-surgeon, multicentre | 71 (8, NA) | 79 | NA | 5.6 (4.2-7.1) | 97 | Biomet |
| Ceramic on polyethylene v metal on metal | |||||||||||
| Clarke, 2003, UK33 | Comparative | Moderate | 249 (229) | C-P 1995-8; M-M 1998-2002 | Single surgeon, single centre | 56.1 (NA, 24-69) | 51 | 100 (0) | 3 months (NA) | 100 | Johnson & Johnson |
| Dorr, 2004, US34 | Randomised | Low | 615 (561) | Aug 1999 start | Multi-surgeon, multicentre | 60 (NA, 27-85) | NA | NA | 5 (NA) | NA | Zimmer (previously Sulzer) |
| Ceramic on ceramic v metal on polyethylene | |||||||||||
| Bascarevic, 2010, Serbia38 | Randomised | Moderate to high | 157 (150) | Jan 2003-April 2008 | Multi-surgeon, single centre | 54.8 (6.8) | 26 | 84 (5) | 51 months | Zimmer | |
| Capello, 2008,30 D’Antonio, 2005, US31 | Randomised | Moderate to high | 289 (278) | Oct 1996-Oct 1998 | Multi-surgeon, multicentre | 53 (NA) | 36 | 82 (15) | 8 (5-NA) | 93 | Stryker Orthopaedics |
| Capello “partial,” 2008, addition of 4th system, Trident, US30 | Comparative | Moderate to high | 186 (174) | Sep 1999-Sep 2000 | Multi-surgeon, multicentre | 51.8 (NA) | 31 | NA | 6.5 (5-NA) | NA | Stryker Orthopaedics |
| Ceramic on ceramic v ceramic on polyethylene | |||||||||||
| Hamilton, 2010, US20 | Randomised | Moderate to high | 264 (263) | 2003 | Multi-surgeon, multicentre | 56.7 (NA, 20-75) | 48 | 88 (6) | 31 months (21-49 months) | 88 | CeramTec, DePuy, DePuy-Johnson & Johnson |
| Kim, 2009, South Korea35 | Randomised | Moderate to high* | 200 (100) | Jan 2000- Jan 2002 | Single surgeon, single centre | 45.3 (NA, 21-49) | 34 | 10 (63) | 5.6 (5-7) | 100 | DePuy |
| Lewis, 2010, Canada39 | Randomised | Moderate | 56 (55) | Oct 1997-Oct 1999 | 1-2 surgeons, single centre | 42.1 (8.0) | NA | 41 (11) | 96 months (1-10) | 93 | Wright Medical |
| Lombardi, 2010, US21 | Randomised | Low | 89 (80) | June 2000 | Single surgeon | 58 (NA) | 46 | 84 (9) | 6.1 (2.1-9.0) | NA | BioMet |
| Ochs, 2007 Germany22 | Randomised | Moderate to high | 66 (66) | 1997-9 | Multi-surgeon, single centre | 58.7 (7.8, NA) | 42 | 53 (NA) | 8.1 (7.1-9.2) | 65 | Braun-Aesculap, CeramTec |
| Poggie, 2007, US23 | Randomised | Low | 472 (429) | Oct 1999- Jan 2003 | Multi-surgeon | 54 (12, 23-76) | 45 | 77 (17) | 2 | 99 | Zimmer/CeramTec |
| Ceramic on polyethylene v metal on polyethylene | |||||||||||
| Kawate, 2009, Japan25 | Randomised | Low | 62 (60) | July 2001-July 2003 | Multi-surgeon | 61.1 (NA, 30-78) | 88 | 69 (18) | 5 (4.8-5.4) | 100 | Japan Medical Material |
| von Schewelov, 2005, Sweden26 | Randomised | Low | 114 (114) | 1996-8 | Multi-surgeon, multicentre | 64 (NA, 50-76) | 54 | NA | 5 (NA) | 92 | DePuy, DePuy-Johnson & Johnson |
| Ceramic on ceramic v metal on metal | |||||||||||
| Grubl, 2006, Austria24 | Randomised | Low | 28 (28) | Nov 2000-Feb 2002 | NA | 62.2 (NA, 32-81) | 64 | 93 (7) | 1 (NA) | NA | Zimmer, CeramTec |
NA=not available (not applicable or not provided).
*In this study each person served as his/her own control (bilateral procedures). Functional outcomes are challenging to determine but potentially possible. Uncertainty about surgeon’s involvement in functional outcome measurement leads to less than perfect quality classification.