In ankle dorsiflexion MMT, what helps isolate the movement from the knee?

• A. The leg is supported
• B. The knee is extended
• C. The ankle is plantarflexed
• D. The thigh is stabilized

Answer: (A)

Isolating ankle dorsiflexion means keeping the movement at the ankle without the knee getting involved. The gastrocnemius crosses both the knee and the ankle, so if the leg isn’t stabilized, knee motion can allow the gastrocnemius to contribute and bias the test toward plantarflexion. Supporting the leg provides stable contact with the table and prevents unintended knee motion, forcing the movement to be produced mainly by the ankle joint and the tibialis anterior. That stabilization makes the test a true measure of dorsiflexion strength at the ankle. The other options either don’t fix the knee as effectively or could alter muscle length or leverage in a way that doesn’t isolate the ankle movement as cleanly.