The article seems to be almost 20 years old. It seems to me not worth to be a reference! I doubt you will be able to get it for free, unless someone has it lying about.
If you visit a local University, which has a health department (preferably also physiotherapy) you are likely to find it in their archive. Otherwise you could try search machines as PEDRO, Medline. I doubt you will get the full article for free though (which seems silly to me after 18 years when it is looked upon, I suppose, as some form of antiquity).
By the way what do you need it for?