SP 5 This point is found on the medial aspect of the hock on the medial border of the medial branch of the long digital extensor as it merges with the tarsus. Insertion is 3 mm into the insertion of the tendon with a 13mm needle.
Another description: Locate the medial malleolus of the ankle and then its most antero-ventral aspect. SP5 is found in a depression just anterior to this location.
My Graphic
In practice, SP5 is found by identifying the medial branch of the long digital extensor as it passes down in front of the ankle joint. It may be felt as a rubbery structure which merges with the tarsus medially.
The needle is inserted into the insertion of this tendon,
as if to go between the tendon and the tarsus.