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Table 3 Outcomes of the 3SAM measurements

From: Clinical evaluation of manual stress testing, stress ultrasound and 3D stress MRI in chronic mechanical ankle instability

Relative reduction of cartilage contact area in % of NN CON MAI Group difference [95%CI upper;lower] Sign.
at rest
 CCAFT - 32.8 ± 16.4 - 56.3 ± 20.0 23.5 [13.1; 34] P < 0.001, F(1,49) = 20,688, η2 = .33
 CCATTH - 35.1 ± 19.8 - 40.9 ± 18.4 5.8 [−5.0; 16.7] P = 0.29, F(1,49) = 1165 η2 = .01
 CCATTV - 45.0 ± 27.7 - 58.1 ± 23.6 13.1 [− 1.5; 27.7] P = 0.07, F(1,49) = 3249 η2 = .02
+ axial loading (200 N)
 CCAFT - 30.3 ± 17.5 - 52.9 ± 21.4 22.6 [11.3; 34.0] P < 0.001, F(1,49) = 16.065 η2 = .26
 CCATTH - 31.2 ± 20.8 - 41.1 ± 22.2 9.9 [−2.3; 22.1] P = 0.1, F(1,49) = 2644 η2 = .05
 CCATTV - 38.2 ± 28.4 - 55.2 ± 27.8 17.0 [.34; 33.7] P = 0.04, F(1,49) = 4232η2 = .04
  1. CCAFT fibulotalar cartilage contact area, CCATTH horizontal tibiotalar cartilage contact area, CCATTV vertical tibiotalar cartilage contact area., CON control group, MAI mechanical instability group, NN MRI acquisition in neutral-null position, CI confidence interval