Table 3.
Other functional outcomes in comparative studies of various bearing surfaces in hip replacements. Figures are mean (SD) scores on each scale
| Study | Metal on metal | Ceramic on ceramic | Metal on polyethylene | Ceramic on polyethylene | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Preoperative | Postoperative | Preoperative | Postoperative | Preoperative | Postoperative | Preoperative | Postoperative | ||||
| Dahlstrand, 2009, Sweden27 | |||||||||||
| SF-36: PF | 32.6 (22.6) | 67.2 (26.9)* | NA | NA | 40 (24.5) | 77 (19.3)* | NA | NA | |||
| SF-36: BP | 33.3 (19.4) | 67.9 (31.7)* | NA | NA | 39.3 (19.2) | 76.7 (27.9)* | NA | NA | |||
| Engh, 2009, US28 | |||||||||||
| WOMAC | NA | 88 (15) | NA | NA | NA | 89 (19) | NA | NA | |||
| PCS (SF-12) | NA | 46.2 (11.6)† | NA | NA | NA | 51 (9)† | NA | NA | |||
| MCS (SF-12) | NA | 56.8 (7)‡ | NA | NA | NA | 55 (6)‡ | NA | NA | |||
| MacDonald, 2003, US36 | |||||||||||
| WOMAC | 58.7 (15.3) | 17.3 (15.1 ) | NA | NA | 59.1 (14.5) | 19.9 (18.9) | NA | NA | |||
| PCS SF-12 | 32.8 (10.2) | 47.2 (9.6) | NA | NA | 31.1 (4.7) | 45.5 (11.7) | NA | NA | |||
| MCS SF-12 | 53.5 (9.6) | 55.9 (6.2) | NA | NA | 53.6 (11.6) | 53.3 (11.7) | NA | NA | |||
| Zijlstra, 2009, Netherlands29 | |||||||||||
| Oxford hip score | 40 (8) |
19 (8) | NA | NA | 40 (8) | 18 (8) | NA | NA | |||
| Lewis, 2010, Canada39 | |||||||||||
| St Michael’s score | NA | NA | 15.8 | 22.9 | NA | NA | 16.2 | 22.8 | |||
| Grubl, 2006, Austria24 | |||||||||||
| UCLA activity score | NA | 7/10 points§ | NA | 7/10 points§ | NA | NA | NA | NA | |||
UCLA=University of California, Los Angeles; PF=physical function; BP=bodily pain; PCS=physical component score; MCS=mental component score; WOMAC=Western Ontario and McMaster Universities activity score; NA=not available (not applicable or not provided).
*At 24 months.
†Difference significant (P=0.03). Mean score for metal on metal calculated from two groups (28 mm and 36 mm head sizes).
‡Difference not significant. Mean score for metal on metal calculated from two groups (28 mm and 36 mm head sizes).
§At 12 months.