It seems that a minimum level of tendon load is neces-sary to result in a significant and clinically relevant [≥ 12 mm (Kelly, 2001)] decrease in pain when using an orthosis. The results from the functional tests show that use of a patellar strap or sports tape can produce a clini-cally relevant decrease in pain when performing a single-leg decline squat 10 times and a close-to-relevant
(11.5 mm) decrease in the vertical jump test on one leg. During the testswith relatively lowload (the 1× single-leg decline squat) or during tests where one can compensate with the other leg (the vertical jump test with both legs), no effect of the orthoseswas found. Since jumps are often
performed in several sports with high prevalence of PT (like volleyball and basketball), the finding that during the one-legged vertical jump test the patellar strap caused a decrease in pain that almost reached the clinical relevance criterion might have practical implications.