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Table 5 The Knee injury and Osteoarthritis Outcome Score for primary and revision ACL reconstruction

From: Comparison of concomitant injuries and patient-reported outcome in patients that have undergone both primary and revision ACL reconstruction—a national registry study

 Primary ACL reconstruction (n = 1014)ACL revision (n = 1014)Change from primary ACL reconstruction to revisionp value
Preoperative KOOS
 Pain75.2 (17.9)
77.8 (0.0; 100.0)
n = 853
76.1 (19.2)
80.6 (11.1; 100.0)
n = 898
1.3 (18.8)
0.0 (− 83.3; 66.7)
n = 754
0.017
 Symptoms69.7 (18.3)
71.4 (3.6; 100.0)
n = 852
70.9 (19.3)
71.4 (10.7; 100.0)
n = 898
1.7 (20.7)
0.0 (− 75.0; 67.9)
n = 753
0.032
 ADL84.9 (16.7)
91.2 (0.0; 100.0)
n = 853
85.0 (17.5)
92.7 (2.9; 100.0)
n = 897
0.2 (17.5)
0.000 (− 94.1; 61.8)
n = 753
0.37
 Sports and recreation42.2 (28.0)
40.0 (0.0; 100.0)
n = 853
45.4 (29.9)
45.0 (0.0; 100.0)
n = 898
3.7 (30.7)
0.0 (− 75.0; 100.0)
n = 754
0.002
 QoL34.3 (19.7)
31.3 (0.0; 100.0)
n = 853
34.9 (24.0)
31.3 (0.0; 100.0)
n = 898
1.4 (25.0)
0.0 (− 81.3; 100.0)
n = 754
0.86
 KOOS455.3 (17.7)
55.7 (0.9; 100.0)
n = 853
56.8 (20.4)
56.5 (7.9; 100.0)
n = 898
2.0 (19.7)
1.9 (− 59.4; 61.5)
n = 754
0.012
One−year postoperative KOOS
 Pain79.9 (18.7)
86.1 (5.6; 100.0)
n = 613
78.2 (20.6)
84.7 (5.6; 100.0)
n = 482
− 3.1 (20.1)
− 2.8 (− 63.9; 91.7)
n = 303
0.003
 Symptoms72.8 (19.6)
75.0 (14.3; 100.0)
n = 612
71.1 (21.1)
75.0 (3.6; 100.0)
n = 482
− 2.8 (20.1)
0.0 (− 64.3; 60.7)
n = 302
0.014
 ADL88.0 (16.3)
94.1 (11.8; 100.0)
n = 612
86.6 (18.3)
94.1 (2.9; 100.0)
n = 482
− 2.6 (16.1)
0.0 (− 61.8; 57.4)
n = 302
0.006
 Sports and recreation56.0 (31.0)
60.0 (0.0; 100.0)
n = 613
51.9 (30.3)
52.5 (0.0; 100.0)
n = 482
− 5.2 (32.2)
− 5.0 (− 95.0; 100.0)
n = 303
0.002
 QoL46.8 (28.2)
43.8 (0.0; 100.0)
n = 613
45.8 (26.2)
43.8 (0.0; 100.0)
n = 482
− 1.8 (29.3)
0.0 (− 81.3; 93.8)
n = 303
0.17
 KOOS463.8 (22.2)
66.9 (7.9; 100.0)
n = 613
61.7 (22.4)
64.6 (3.7; 100.0)
n = 482
− 3.2 (22.3)
− 3.2 (− 59.8; 62.3)
n = 303
0.01
KOOS change preoperative to one−year follow up
 Pain5.8 (17.6)
5.6 (− 55.6; 66.7)
n = 452
2.8 (19.7) 2.8 (− 75.0; 72.2) n = 366− 3.2 (28.2) − 2.8 (− 77.8; 94.5) n = 2010.033
 Symptoms4.3 (19.6)
3.6 (− 78.6; 60.7)
n = 451
0.6 (20.6) 0.0 (− 89.3; 89.3) n = 366− 4.5 (.)(− 82.1; 121.4) n = 2000.011
 ADL3.7 (15.9)
1.5 (− 55.9; 61.8)
n = 451
2.1 (15.6) 0.0
(− 54.4; 55.9)
n = 365
− 0.6 (22.7)
− 1.5 (− 57.4; 97.1)
n = 200
0.088
 Sports and recreation16.4 (31.3)
15.0 (− 85.0; 100.0)
n = 452
8.1 (32.7)
5.0 (− 100.0; 100.0)
n = 366
− 7.1 (46.9)
− 10.0 (− 115.0; 130.0)
n = 201
0.024
 QoL15.6 (28.4)
12.5 (− 100.0; 87.5)
n = 452
12.1 (29.9)
12.5 (− 100.0; 93.8)
n = 366
− 3.8 (44.5)
− 6.3 (− 137.5; 125.0)
n = 201
0.26
 KOOS410.5 (20.6)
11.3 (− 71.8; 69.9)
n = 452
5.9 (22.5)
5.9 (− 91.1; 71.4)
n = 366
− 4.6 (32.00)
− 4.2 (− 79.2; 99.3)
n = 201
0.028
  1. The mean (SD)/median (min; max)/n = is presented
  2. For comparison over time, the Wilcoxon signed rank test was used
  3. KOOS Knee injury and Osteoarthritis Outcome Score, ADL activities of daily living, QoL quality of life