Table 3.
Clinical and radiographic results at the latest followup
| Group 1 | Group 2 | Group 3 | p value | |
|---|---|---|---|---|
| (N = 126) | (N = 115) | (N = 106) | ||
| Postoperative functional outcomes | ||||
| Knee Society pain score (points) | ||||
| Mean (SD) | 88 (14) | 92 (12) | 89 (14) | 0.06 |
| Knee Society function score (points) | ||||
| Mean (SD) | 67 (29) | 72 (24) | 72 (25) | 0.21 |
| Motion extension (degrees) | ||||
| Mean (SD) | 0.0 (3.9) | 0.1 (0.8) | 0.3 (1.4) | 0.69 |
| Motion flexion (degrees) | ||||
| Mean (SD) | 114.6 (14.1) | 117.7 (11.4) | 114.8 (10.9) | 0.09 |
| Change Knee Society pain score (points difference) | ||||
| Mean (SD) | 35 (18) | 41 (19) | 36 (18) | 0.02 |
| Change Knee Society function score (points difference) | ||||
| Mean (SD) | 16 (26) | 19 (23) | 18 (23) | 0.61 |
| Postoperative radiographic assessment | ||||
| Knee Society AP femur flexion (degrees) | ||||
| Mean (range) | 95 (89.9–100.1) | 94.7 (85.5–104.6) | 94.9 (90.3–99.3) | |
| Knee Society AP tibia flexion (degrees) | ||||
| Mean (range) | 89.9 (82.3–95.9) | 89.7 (84.8–94.2) | 90.0 (85.1–94.5) | |
| Knee Society total valgus angle (degrees) | ||||
| Mean (range) | 4.9 (178–192.7) | 4.4 (174.9–193.6) | 4.9 (175.6–191.8) | |
| Knee Society lateral femur flexion (degrees) | ||||
| Mean (range) | 4.7 (−5.0 to 14.7) | 5.1 (0.0–0.5) | 5.2 (0.0–11.9) | |
| Knee Society lateral AP tibia flexion (degrees) | ||||
| Mean (range) | 84.9 (78.9–93.4) | 84.5 (76.5–91.1) | 83.6 (75.2–90.0) | |
| Nonprogressive medial radiolucent lines | ||||
| Yes | 13 (11%) | 4 (3%) | 2 (2%) | 0.01 |
| No | 113 (89%) | 111 (97%) | 104 (98%) | |
| Nonprogressive lateral radiolucent lines | ||||
| Yes | 9 (8%) | 2 (2%) | 1 (1%) | 0.01 |
| No | 117 (92%) | 113 (98%) | 105 (99%) | |
Group 1 = traditional cemented modular tibia; Group 2 = cemented nonmodular highly porous tibia (as per original FDA approval); Group 3 = uncemented nonmodular highly porous tibia.