"The Effects of Exercise for the Prevention of Overuse Anterior Knee Pain : A Randomized Controlled Trial"- Coppack et all, AJSM 6-11.
Pretty simple, 4 PRE's & 4 static stretches caused a 75% reduction in anterior knee pain among military recruits. Some of the exercises were "functional", & some were not. What I found interesting was 3 of Kelvin Giles' PCA assessments (although not referred to by name) were used as exercises. As budgets tighten & P.E. programs begin to disappear we see the decline of physical competency & literacy. You cannot have a decent athletic development program without it. Depending on the task at hand, it could be a knee injury, a shoulder, back etc. Let's not get so nit picky with our assessments that we lose site of the big picture. Do they have the right stuff or don't they? And if they don't, weave it in to their return to play repertoire. Believe me, the greatest gift you can give an injured athlete is to let them leave you a little more athletic then when they came in.