Fig. 4From: Quality of knee strengthening exercises performed at home deteriorates after one weekGraphs of the hip and knee angles during “V out” and “V in” exercise. The graphs represent only participant 6. A: knee angles in the sagittal plane (flexion/extension) and B: hip angle in the transverse plane (rotation) during the “V out” exercise; C: knee angles in the sagittal plane (flexion/extension) and D: hip angle in the transverse plane (rotation) during the “V in” exercise. Solid lines represent the average of 5 repetitions for each exercise at the first visit while dotted lines represent the same for the second visit; the shaded gray area around each line represents standard deviation of the 5 repetitions; X-axis: time normalized in percentageBack to article page