Fig. 1
From: Feasibility of ultrasound measurement in a human model of acute compartment syndrome
a, b Schematic illustration of increasing compartment pressure and angle measurement. Schematic illustration of sonographic TFA (tibia-fascia angle) measurement. One line (X) was set on the anterolateral cortex of the tibia. The other line (Y) was set as a tangent to the curving anterior compartment fascia with its origin at the tibial attachment. TFA was the angle measured between line X and Y. Measurement under normal conditions (a), enlarged angle in the anterior compartment (b)