Table II.
Post-operative results
| Characteristic | UKA group | TKA group | p-value |
|---|---|---|---|
| Follow-up (yrs) | 5.4 (sd 0.8, 2 to 7) | 5.5 (sd 1.2, 2 to 7) | 0.503 |
| Length of hospital stay (days) | 1.4 (sd 0.7, 1 to 4) | 2.1 (sd 1.0, 1 to 7) | < 0.001 |
| Discharge disposition | < 0.001 | ||
| Not available | 7 (4) | 0 (0) | |
| Home | 183 (91) | 150 (79) | |
| Extended care facility | 11 (6) | 39 (21) | |
| Post-operative range of movement (°) | 118.7° (sd 9.2°, 85° to 140°) | 111.6° (sd 12.4°, 70° to 140°) | < 0.001 |
| Improvement in range of movement from pre-operative to most recent (°) | 3.7° (sd 11.9°, -20° to 95°) | 4.9° (sd 14.5°, -40° to 55°) | 0.382 |
| Post-operative Knee Society pain score (0 to 50 possible) | 44.0 (sd 13.0, 0 to 50) | 45.6 (sd 10.7, 0 to 50) | 0.195 |
| Improvement in Knee Society pain score from pre-operative to most recent | 35.4 (sd 17.3, -20 to 50) | 37.3 (sd 14.6, -20 to 50) | 0.225 |
| Post-operative Knee Society clinical score (0 to 100 possible) | 90.3 (sd 15.5, 31 to 100) | 88.6 (sd 14.2, 45 to 100) | 0.265 |
| Improvement in Knee Society clinical score from pre-operative to most recent | 50.8 (sd 20.7, -35 to 81) | 49.1 (sd 20.8, -11 to 81) | 0.420 |
| Post-operative Knee Society function score (0 to 100 possible) | 77.6 (sd 24.3, 0 to 100) | 66.0 (sd 27.8, 0 to 100) | < 0.001 |
| Improvement in Knee Society function score from pre-operative to most recent | 19.3 (sd 25.8, -55 to 100) | 15.3 (sd 25.8, -55 to 90) | 0.135 |
UKA, unicompartmental knee arthroplasty; TKA, total knee arthroplasty; UKA, sd, standard deviation