How consistent are physiotherapists in the advice they give to knee osteoarthritis patients?  It could be better, it seems.  The important message from the linked paper's abstract: 
Quality indicator compliance less than 50% was found for: education on the importance of weight loss, providing self-management strategies, spreading treatment session over longer periods and regular evaluations of the exercise therapy.
Less than 50% give advice for weight loss!  Shouldn't that be one of the first things one would say, given how many people in Belgium, where this study was conducted, are overweight?