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Table 2 Comparison between study centers

From: Better short-term function after unicompartmental compared to total knee arthroplasty

  Center A Center B Center C p-value
Demographic findings
gender
  Female 12 32 11 0.210
  Male 22 27 13
age 59.5 (53.0; 64.2) 65.0 (60.5.; 73.6) 61.5 (56.2; 64.7) 0.001*
BMI 28.9 (27.4; 32.8) 29.4 (26.9; 31.9) 29.1 (26.7; 33.0) 0.976
Cut-sew time 78.5 (72.0; 84.0) 72.0 (68.0; 76.0) 60.0 (60.0; 60.0) < 0.01*
Radiographic findings
Mechanical alignment (− Varus, + Valgus) −4.0 (−5.0; − 2.6) −2.7 (− 3.9; − 1.3) − 4.8 (− 7.4, − 3.4) 0.019
Anatomical axis (neutral = 186°) 182.1 (181; 183.4) 183.3 (182.1; 184.7) 181.2 (178.6; 182.6) 0.019
Medial proximal tibia angle (MPTA) 86.6 (84.6; 88.6) 87.5 (86.3; 89.0) 86.3 (85.6; 88.0) 0.105
Posterior Tibial Slope 86.8 (85.2; 88.6) 83.8 (81.7: 85.0) 87.2 (84.9; 81.7) < 0.01
Patient reported outcome
Knee Society Score
  Knee Score
   1 years 88.5 (75.0; 93.0) 90.0 (86.0; 94.0) 88.0 (75.0; 95.0) 0.414
   2 years 90.0 (80.0; 94.0) 92.0 (86.0; 95.0) 86.5 (73.0; 94.0) 0.048*
  Function Score
   1 year 100 (90.0; 100) 97.5 (80.0; 100) 90.0 (80.0; 100) 0.513
   2 years 100 (90.0; 100) 90.0 (80.0; 100) 100.0 (90.0; 100) 0.054
  Total Knee Score
   1 year 177.5 (165.0; 192.0) 185.5 (161.0; 191.0) 184.0 (168.0; 186.0) 0.584
   2 years 182.5 (179.0; 193.0) 183.0 (166.0; 191.0) 178.0 (163.0; 194.0) 0.512
KOOS
  Pain
   1 year 91.6 (75.0; 97.2) 88.8 (69.4; 94.4) 83.3 (77.7; 91.6) 0.513
   2 years 88.8 (72.2; 97.2) 91.6 (77.7; 97.2) 77.7 (69.4; 86.1) 0.054
  Symptoms
   1 year 82.1 (67.8; 92.8) 85.7 (75.0; 92.8) 78.5 (71.4; 85.7) 0.197
   2 years 82.1 (75.0; 92.8) 89.2 (78.5; 96.4) 78.5 (64.2; 89.2) 0.008*
  Function, daily living (ADL)
   1 year 92.6 (72.0; 98.5) 89.7 (72.0; 95.5) 86.7 (70.5; 92.6) 0.247
   2 years 89.7 (75.0; 98.5) 91.1 (73.5; 97.0) 80.8 (72.0; 85.2) 0.031*
  Function, sports and recreation
   1 year 50.0 (30.0; 70.0) 65.0 (35.0; 80.0) 65.0 (50.0; 80.0) 0.243
   2 years 65.0 (40.0; 75.0) 65.0 (50.0; 85.0) 67.5 (55.0; 75.0) 0.918
  Quality of Life (QoL)
   1 year 68.7 (43.7; 87.5) 71.9 (43.7; 81.2) 68.7 (50.0; 75.0) 0.875
   2 years 68.7 (50.0; 81.2) 75.0 (50.0; 93.7) 68.7 (50.0; 75.0) 0.368
  Load pain (VAS)
   1 year 0.7 (0.0; 3.4) 1.5 (0.0; 3.0) 2.0 (1.0; 3.0) 0.163
   2 years 0.4 (0.0; 2.4) 1.5 (0.0; 2.0) 2.5 (1.0; 4.0) 0.007
  Satisfaction
   1 year 10 (8.6; 10) 9.0 (8.0; 10) 9.0 (7.0: 10) 0.108
   2 years 10 (8.3; 10) 9.8 (8.5; 10) 9.0 (8.0;10) 0.076
  1. Summary of patient-related outcome measures, functional findings and demographic parameters. * = statistically significant result, p < 0.05