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It happened to me, and happens every now and then... not to the point of falling down but you get the idea - my quad sometimes forgets to fire and lets the knee collapse forward/down... it happens. It's usually when I feel lazy, and I kind of feel lazy all the time.

If you're tired chances increase of this happening.

I have had the same things happen to me while jumping several times with continued pain. I have a knee condition called bipartita patella. This means that my knee cap is in two pieces instead of 1 fused patella. I was diagnosed with this in high school and have suffered ever since then. I have avoided alot of sporting activities and lifting for a long time. I have recently got back into strengthening and basketball. The pain has come back just as before. I recently saw an orthopedic Dr. and xrays confirmed that the bipartita patella is still the same...not fused....this coupled with a weight bearing activity like jumping and or bending at the knee can cause this 2 part knee cap to rub together and cause pain under the knee. This isnt the only thing that I have uncovered with my problem. I have been getting deep tissue massages on my legs including and focusing on my IT Band. I have alot of pain and tension in the lateral leg. I mean extreme pain in those tendons with deeper pressure. I believe that this along with some other muscular tension, leg flexibility and leg weakness is contributing to my pain and or my knee giving out. I am trying to get the legs stretched out, strengthened and massaged. I am also doing some PT soon so will see what they say. I would get an Xray to see if you may be 1% of the population that has bipartita patella and go from there. Good Luck

Yes my knees do click on the lateral side but i also have some clicking in the middle too. It clicks half way through a leg extension. I dont have pain when I do that motion. I only have the pain when I put weight on the knee like in a squat or lunge type action.

To the original poster... This same EXACT thing happened to me last month. Worst injury ever. Left knee buckled and I tumbled over into the bleachers during a game. I kept playing as well. Anyway, got x-rays and no bones are broken. I need an MRI but don't have the $$$ for that. My close friend is an orthopedic doctor for the navy, I contacted him and he said to keep rehabbing it (extending and retracting) and strengthen the muscles around it. (Quads, hams.)  Most likely a tendon or ligament is torn in there somewhere. I've never had knee problems in my whole 26 yrs of living lol I've had a whole lot of ankle problems though. This knee shit really complicates shit now... (As far as training goes and everyday living.) I get crazy knee pain upon getting up and sitting down. I still play ball tho. I just use ice/painkillers when it gets out of hand. Left knee just feels unstable all the time. I still squat too. Last saturday I half squatted 245 for 3 sets of 10. (Work sets) PR in reps too.

Are you seeing signs of improvement as the days go by?

Judging from what you describe,

My guts feelings is these cases

Patellar tendonitis and Torn Meniscus

Pattelar tendonitis is what we called jumper knee. From over training, the tendon get inflammation and you can't bend your knee properly. The pain actually feels like under your lower part knee cap.

The other one is your meniscus kinda like cushion which sit between your thigh bone and shinbone got torn and not as smooth. Pain, click and popping sound will occur when your bend your legs.

I personally got "jumper" knees, and the only remedy for me is to rest and rehab my legs for three months.  Torn meniscus can heal over time, however some case required simple surgery to fix the problem.  My advice will be seek a doctor. Sorry.

Well as I stated, I do have OSD and yeah they flare up whenever I overuse them ( too much basketball)...

I don't think it's the other as my knee does not click and it functions fine, just with pain..

Thanks though

@Ineedtodunk - I can say it did get a little better compared to last month but there's still soreness (maybe even tendonitis now). I would check out the "The knee (p)rehab thread" in this section (even though its incomplete) to help ya out on training/rehab going forth.