One session of talus posteriorization.

Two sessions of talus posteriorization.

Three sessions of talus posteriorization.

Four sessions of talus posteriorization.

Three sets of a 30-s grade IV anteroposterior mobilization.

Number of sessions of experimental intervention needed to induce a clinically important gain in ankle mobility after the intervention. A baseline progression over 4.6º in the Lunge test will be considered clinically important (Powden, 2015), so that the number of sessions will be established when this threshold is exceeded (see secondary outcome) .

Weight bearing ankle dorsiflexion range of motion. This test will measure the maximum tilt of the tibia that a subject can perform while standing and bearing the weight on the limb without lifting the heel from the floor. A Baseline® Digital Inclinometer (Fabrication Enterprises Inc) will be used to assessed this outcome. Values below 35º indicate limited mobility. A baseline progression over 4.6º will be considered clinically important (Powden, 2015). This mobility gain will be used to determine the dose-response relationship: number of sessions of talus mobilizations needed to induce a clinically important gain in ankle mobility after the intervention (see primary outcome measure)