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Table 4 Clinical features of the satisfaction group and the dissatisfaction group

From: Factors affecting the clinical outcomes including patient satisfaction after Oxford unicompartmental knee arthroplasty: a retrospective study

  Satisfaction
Group
Dissatisfaction Group P Value
Age (year) (mean ± SD) 64.4 ± 7.5 65.1 ± 7.3 0.753
Sex ratio (female:male) 20:53 5:9 0.532
BMI (kg/m2) (mean ± SD) 26.0 ± 3.9 26.6 ± 3.6 0.580
Operated side (left:right) 41:32 8:6 1.000
Operative duration (min) (mean ± SD) 108.5 ± 24.6 119.2 ± 30.0 0.154
SONK (yes:no) 12:61 3:11 0.702
Preoperative complications (yes:no) 33:40 7:7 0.777
TSO (months) (mean ± SD) 34.6 ± 15.6 36.1 ± 14.1 0.746
Preoperative NRS score (median (LQ, UQ)) 6.0 (5.0, 7.0) 6.0 (6.0, 7.0) 0.605
Postoperative NRS score (median (LQ, UQ)) 1.0 (0, 2.0) 3.0 (2.75, 5.0) < 0.001
NRS score improvement (median (LQ, UQ)) 5.0 (4.0, 6.0) 3.0 (2.0, 4.0) 0.001
Preoperative KSS (mean ± SD) 113.9 ± 28.5 108.3 ± 19.4 0.374
Preoperative knee score (mean ± SD) 58.5 ± 16.0 60.8 ± 10.8 0.608
Preoperative function score (mean ± SD) 55.4 ± 18.5 47.5 ± 10.5 0.126
Postoperative KSS (mean ± SD) 173.7 ± 18.8 133.2 ± 18.4 < 0.001
Postoperative knee score (median (LQ, UQ)) 95.0 (85.0, 99.0) 80.0 (62.75, 89.0) < 0.001
Postoperative function score (median (LQ, UQ)) 80.0 (70.0, 90.0) 60.0 (50.0, 60.0) < 0.001
KSS improvement (mean ± SD) 59.9 ± 30.0 24.9 ± 29.1 < 0.001
Preoperative FTA (°) (mean ± SD) 180.6 ± 3.6 181.6 ± 3.5 0.319
Postoperative FTA (°) (median (LQ, UQ)) 176 (175, 178) 177 (176, 178) 0.240
Varus correcting (°) (mean ± SD) 3.9 ± 3.6 4.4 ± 3.6 0.657
Angle A (ED:AD) 0:73 0:14
Angle B (ED:AD) 3:70 2:12 0.181
Angle E (ED:AD) 17:56 8:6 0.020
Angle F (ED:AD) 2:71 1:13 0.413
Prosthesis overhang (yes:no) 4:69 1:13 1.000
Prosthesis loosening (yes:no) 0:73 0:14
Postoperative complications (yes:no) 5:68 1:13 1.000
  1. SD standard deviation, BMI body mass index, SONK spontaneous osteonecrosis of the knee, TSO time since operation, NRS Numerical Rating Scale, LQ lower quartile, UQ upper quartile, KSS Knee Society Score, FTA femorotibial angle, ED excessive deviation, AD allowable deviation.