Intra-Tester and Inter-Tester Reliability of the Lachmeter When Measuring Knee Joint Laxity
Table 4
Inter-tester reliability for measurements of anterior tibial translation (mm) in healthy subjects (n = 23) 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
−0.30 (0.83) [−0.65; 0.06]
0.10
0.84 [0.63; 0.93]
Good reliability
0.33
0.92
Dominant Tester 1 vs. 2
−0.40 (0.75) [−0.72; 0.08]
0.02
0.87 [0.65; 0.95]
Good reliability
0.27
0.75
AD grip
Non-dominant Tester 1 vs. 2
0.04 (1.29) [−0.52; 0.60]
0.89
0.77 [0.46; 0.90]
Good reliability
0.62
1.71
Dominant Tester 1 vs. 2
−0.29 (1.25) [−0.83; 0.25]
0.28
0.71 [0.33; 0.88]
Moderate reliability
0.67
1.87
L grip
Side-to-side Tester 1 vs. 2
0.03 (0.69) [−0.27; 0.33]
0.82
0.41 [−0.44; 0.75]
Poor reliability
0.53
1.47
AD grip
Side-to-side Tester 1 vs. 2
0.28 (0.80) [−0.06; 0.63]
0.10
0.42 [−0.27; 0.75]
Poor reliability
0.61
1.69
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 healthy subjects (n = 24). values correspond to the results from using Student’s paired t-tests to test for differences between Tester 1 and Tester 2.
