Intra-Tester and Inter-Tester Reliability of the Lachmeter When Measuring Knee Joint Laxity
Table 5
Inter-tester reliability for measurements of anterior tibial translation (mm) in ACL patients (n = 6) performed by two testers.
Grip
Leg
Dif. between testers mean (SD) [95% CI]
value
Average ICC [95% CI]
Interpretation of ICC
SEM
SDC
L grip
Non-dominant Tester 1 vs. 2
−1.43 (1.04) [−2.52; −0.33]
0.02
0.76 [−0.28; 0.97]
Good reliability
0.51
1.41
Dominant Tester 1 vs. 2
−1.20 (1.60) [−2.90; 0.47]
0.13
0.83 [0.02; 0.97]
Good reliability
0.66
1.83
AD grip
Non-dominant Tester 1 vs. 2
−0.81 (0.84) [−1.69; 0.07]
0.06
0.88 [0.08; 0.98]
Good reliability
0.29
0.81
Dominant Tester 1 vs. 2
−0.80 (1.27) [−2.14; 0.54]
0.18
0.89 [0.36; 0.98]
Good reliability
0.42
1.17
L grip
Side-to-side Tester 1 vs. 2
−0.44 (0.86) [−1.35; 0.46]
0.26
0.89 [0.36; 0.98]
Good reliability
0.29
0.79
AD grip
Side-to-side Tester 1 vs. 2
0.48 (1.14) [−0.72; 1.68]
0.35
0.61 [−1.36; 0.94]
Moderate reliability
0.71
1.97
L grip: Lachman grip; AD grip: anterior drawer grip; ICC: intra-class correlation coefficient. Anterior tibial translation was measured in mm, and the difference between Tester 1 and 2 is presented in ACL patients (n = 6). values correspond to the results from using Student’s unpaired t-tests to test for differences between Tester 1 and Tester 2.
