There is an acupoint in the recess immediately behind the outer anklebone.

Normally used in combination with acupoint 6. Acupoint 5 is a hand's-breadth above the end of the inner anklebone, behind the shinbone.

This acupoint is very effective in lower-body problems, especially in combination with acupoint 5. It is a hand's-breadth below the bottom of the kneecap, on the outer side of the calf, in the cavity between the shinbone and the leg muscle.