Subacromial Impingement Syndrome (SIS) and how it develops differs greatly between clinicians and paleopathologists. Clinical studies note that a particular type of scapular morphology (form) as being an important factor.This view is not shared by many anthropologists who insist that SIS is a result of altered biomechanics (function). This osteological study set out to determine whether the presence of a particular morphological package was associated with SIS. A total of 62 adult human scapulae were selected from a Proto-Prehistoric New Zealand Polynesian Collection and from a Neolithic Thai...