A Positive Quadriceps Active Test, without the Quadriceps Being Active

Figure 3

Clinical photographs with the effect of gastrocnemius contraction illustrated. Patient with a PCL injury and posterior sag sign. Diagrammatic depiction of the gastrocnemius muscle bulk while relaxed (a) and contracted (b) to demonstrate the shortening but widening of the gastrocnemius muscle bulk with contraction.

(a)

(b)