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Table 2 Clinical characteristics of the more-KSS-improvement group and the less-KSS-improvement group

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

  More-KSS-improvement Group Less-KSS-improvement Group P Value
Age (year) (mean ± SD) 64.7 ± 7.5 64.3 ± 7.4 0.769
Sex (female:male) 12:32 13:30 0.816
BMI (kg/m2) (mean ± SD) 26.4 ± 3.4 25.8 ± 4.4 0.544
Operated side (left:right) 23:21 26:17 0.519
SONK (yes:no) 10:34 5:38 0.256
Preoperative complications (yes:no) 20:24 20:23 1.000
Preoperative NRS score (median (LQ, UQ)) 6.0 (6.0, 8.0) 6.0 (5.0, 7.0) 0.020
Preoperative FTA (°) (mean ± SD) 180.2 ± 3.5 181.4 ± 3.6 0.105
Angle A (ED:AD) 0:44 0:43
Angle B (ED:AD) 1:43 4:39 0.202
Angle E (ED:AD) 8:36 17:26 0.034
Angle F (ED:AD) 0:44 3:40 0.116
Prosthesis overhang (yes:no) 2:42 3:40 0.676
Prosthesis loosening (yes:no) 0:44 0:43
Operative duration (min) (mean ± SD) 105.7 ± 21.7 114.9 ± 28.6 0.097
TSO (month) (mean ± SD) 30.6 ± 13.2 39.2 ± 16.1 0.008
  1. KSS Knee Society Score, SD standard deviation, BMI body mass index, SONK spontaneous osteonecrosis of the knee, NRS Numerical Rating Scale, LQ lower quartile, UQ upper quartile, FTA femorotibial angle, ED excessive deviation, AD allowable deviation, TSO time since operation.