Fig. 2
From: Quality of knee strengthening exercises performed at home deteriorates after one week
A Between-visit differences (second visit minus first visit) in average knee joint angle during the single-leg raise exercise. B-C Between-visit differences in knee flexion and hip rotation angles, respectively, during the “V in” exercise. D Between-visit differences in hip rotational exercises during the “V out” exercise. The red lines represent the magnitudes of error (°) that make a clinically significant difference; between-visit differences between the zero and red lines indicate participants who performed the exercise correctly