Palpation--problems and implications.

Palpation is one of the main tools in manipulative therapy as well as diagnosis. Analysis of palpation shows that it combines two types of sensation: that of touch and of motion, i.e., proprioception. In addition, it causes interaction with the patient resulting in a feedback-situation, which further complicates reproduction, e.g., objectification and measurement. The objection to palpation being "subjective" is further enhanced by the discovery of palpatory illusion. Thus, there is an urgent need for research in palpation, which could provide basic scientific credibility to manipulative techniques.