The Deltoid muscle often does not get much attention, because its TPs are relatively easy to locate and pain referral is experienced locally.

However, two aspects should be kept in mind:

  1. The Deltoid lies in the pain referral zone of many muscles and as such is prone to developing satellite TPs.
  2. The peculiar, multipennate structure of the lateral part of the Deltoid means that multiple TPs can develop, all of which require active intervention.

Therefore, when treating this muscle be sure to look out for primary TPs in other muscles and to deactivate all clinically relevant (or as many as you can find) TPs.