I have never heard of a harness causing strain on patellas, but now that you mention it, if one is a puller (like Uni is), I would suppose that they would "put their back into it" and subsequently put stress on their knees. I think choking them is worse though. Ugh, this is a tough one.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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