Table 3 Mean values and standard deviations (SD) of surface roughness values and hood scores of all implants investigated; N of all revision reasons
Implant type | Total (N = 23) | NexGen® (N = 15) | Persona® (N = 8) | Comparison | Comparison – corrected for time to revision | ||
|---|---|---|---|---|---|---|---|
Surface roughness (Ra) and Hood Score | Mean, SD | Mean, SD | Mean, SD | R2 | P | R2 | P |
Tibial lateral Ra | 0.14 (+/−0.07) | 0.18 (+/−0.04) | 0.07 (+/−0.04) | 0.68 | .000 | 0.65 | .000 |
Tibial medial Ra | 0.15 (+/− 0.08) | 0.2 (+/− 0.05) | 0.06 (+/− 0.01) | 0.77 | .000 | 0.71 | .000 |
Tibial lateral & medial Ra | 0.15 (+/−0.07) | 0.19 (+/− 0.04) | 0.06 (+/− 0.03) | 0.78 | .000 | 0.75 | .000 |
Femoral lateral Ra | 0.14 (+/− 0.03) | 0.15 (+/− 0.04) | 0.13 (+/− 0.01) | 0.09 | .166 | 0.20 | .046 |
Femoral medial Ra | 0.14 (+/− 0.03) | 0.14 (+/− 0.03) | 0.14 (+/− 0.03) | 0.01 | .745 | 0.06 | .291 |
Femoral lateral & medial Ra | 0.14 (+/− 0.02) | 0.14 (+/− 0.03) | 0.14 (+/− 0.02) | 0.02 | .484 | 0.20 | .046 |
Hood Score articulating lateral | 22.2 (+/−4.8) | 22.1 (+/−4.7) | 22.7 (+/−5.7) | 0.00 | .805 | 0.04 | .387 |
Hood Score articulating central | 12.8 (+/−3.1) | 13.2 (+/−3.0) | 11.8 (+/−3.7) | 0.04 | .381 | 0.00 | .833 |
Hood Score articulating medial | 23.9 (+/−7.2) | 23.6 (+/−8.2) | 24.7 (+/−4.6) | 0.00 | .769 | 0.01 | .617 |
Hood Score articulating total | 59 (+/−10.2) | 58.9 (+/−9.4) | 59.2 (+/−11.0) | 0.00 | .953 | 0.03 | .475 |
Hood Score backside lateral | 22.4 (+/−4.5) | 22.9 (+/− 4.6) | 21.3 (+/− 4.4) | 0.03 | .490 | 0.04 | .410 |
Hood Score backside central | 10.9 (+/−3) | 11.0 (+/−3.3) | 10.5 (+/−2.2) | 0.01 | .740 | 0.02 | .590 |
Hood Score backside medial | 21.2 (+/−5.7) | 22.3 (+/−5.8) | 18.3 (+/−4.7) | 0.11 | .149 | 0.14 | .105 |
Hood Score backside total | 54.5 (+/−10.9) | 56.2 (+/−11.3) | 50.2 (+/−9.2) | 0.07 | .261 | 0.10 | .183 |
Hood Score lateral total | 44.7 (+/−7.2) | 44.9 (+/−6.3) | 44.0 (+/−9.7) | 0.00 | .795 | 0.00 | .956 |
Hood Score medial total | 45.1 (+/−10.5) | 45.9 (+/−11.9) | 43.0 (+/− 6.3) | 0.02 | .577 | 0.01 | .616 |
Hood Score overall total | 113.4 (+/−17.1) | 115.1 (+/−17.1) | 109.3 (+/−18.0) | 0.02 | .502 | 0.01 | .674 |
Reason for revision | N (%) | N (%) | N (%) | R2 | P | R2 | P |
Instability | 17 (73.9) | 9 (60.0) | 8 (100) | 0.19 | .039 | 0.29 | .014 |
Malalignment | 3 (13.0) | 2 (13.0) | 1 (12.5) | 0.00 | .957 | 0.00 | .795 |
Patellofemoral | 4 (17.4) | 1 (7.0) | 3 (37.5) | 0.15 | .068 | 0.03 | .463 |
Stiffness | 4 (17.4) | 3 (20.0) | 1 (12.5) | 0.01 | .669 | 0.11 | .153 |
Others (periprosthetic fracture, progression OA) | 2 (8.7) | 2 (13) | 0 (0) | 0.05 | .301 | 0.01 | .689 |