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I take it back, I just went in the weightroom and set up a 48" hurdle.... I think it might actually be 48".  I have a challenge cut out for me now, haha!

I'll give it a shot soon!  I can do single leg hurdle hops over 39" so I might be able to pull off a single response over higher.  I don't know if I can get 48" though.

thanks guys.  The injury will set me back from full training for about 4 weeks.  I'll be back to front squatting next week probably, but i'll have to work tempo hard and start kind of light. I'll be able to jump and run shortly though. I am working pistol squats like crazy at the moment, trying to get up to Javier Sotomayor status (300 for reps according to Dan Pfaff.... unbelievable!)

I was going to make a comment about his GCT being too long, but then I remembered that he can jump way higher than I can.  So I won't say anything. 

You can definitely have simulaneous contractions of your quad and hams during jumping.  I think your problem lies in the recruitment patterns of your VMO and lateralis.  The low hamstring weakness/collapse makes no sense in terms of that leading to knee collapse.  Well it is an interesting note.... the hamstring is an antagonist to the knee extension in jumping, but an agonist to the hip extension you need.  Of course, the primary driver of hip extension in single leg jumping, as well as the stronger muscle is the glute group.  I suppose if your hamstrings were too active during the eccentric loading of the quad, that could lead to buckling, but whose motor programming would have them do that?  Personally, I think it is more motor patterns and inter/intramuscular coordination rather than direct strength which are leading to your problems.  How is your glute strength?  Perhaps if your glute group wasnt strong enough your hamstring would have to get recruited extra for hip extension?

Maybe try this test for me, try a track and field long jump and see what happens with your leg if it buckles.  The hamstring is going to be more active in that than a dunk attempt. 

my own thoughts, I usually lift in my vibrams so the higher heeled shoes do push me forward a little.

I am having withdrawal symptoms in anticipation of the rest of this video, but you said it was on www.athleticscoaching.ca?

Raptor,

What you are talking about with the function of the hamstrings is more of an issue in regards to the prevention of ACL tears (supposedly, the jury is still out exactly how much that function helps).  The role of the hamstring when the leg is bent slightly is to prevent forward translation/movement of the top of the tibia on the femur. 

If your knee is giving out on jumps, I believe this is purely the function of the quad muscle group, although how is your ankle stiffness?  If you are a hard heel planter that maybe could make things a little harder for your other muscle groups. 

The hamstring really only does 2 things in dynamic movement, flexes the knee and extends the hip.  The hip extension segment is the part of one leg jumping that you should care about and it happens after the whole "knee buckle phase" has passed. 

Also, your quads can be strong, but can they fire quickly? I do see you do a few single leg drops, but from a very low box, maybe you should try a higher box and put the pressure on the front 2/3 of your foot.   

I feel I am correct in this post, but maybe there is research out there I have not seen to prove me wrong