As an acupuncturist, we use acupuncture meridian pictures to treat all kind diseases including pain. It has been used for a couple of thousand years and they are still usable.
It is a good question to which you should be able to hear a variety of answers. I will give a few suggestions here. First let me tell you that I am a teacher at a nursing school in Denmark, but I have recent experience as a bedside nurse from a hematology unit in Denmark. I also have many years experience as a nurse (in various types of positions) from Saudi Arabia in one of the country's leading hospitals. I apologize for talking about me, but I also think it may be valuable for you to know about the settings from where my experience come.
1 The two hospitals, I have worked at, both had computerized medical records. These were built up around a standard format that suited all units in the hospital (some sections more than others). Changes to this system is very difficult to work with. If the desire to get computerized body maps for pain assessment/documentation only comes from one or a few settings, then it is extremely difficult, if not impossible to get such an initiative implemented.
2) Computerized tools that includes patients' direct involvement requires that they have access to the digital device, which could be an IPad or alike. This requires that hospitals must prioritize buying such devices. Security of hospital property can be an issue, and having IPads or alike pose a property security issue, that of course can be addressed but at the same time contributes to the challenges.
3) It might also be related to the busy clinical practice where patient care has to be prioritized in the middle of an increasingly complex patient population, shrinking resources, and increasing demands, which includes implementation of a variety of projects and new approaches. One could then ask why not the approach to the use of computerized body maps for pain assessment, but it is up against a large number of other projects,
I have followed your questions since the time you posted it. I had hope to read many more answers. I hope that with Frieda and my answers that your interesting topic will receive some attention and many more would like to share their perspectives and experiences.