Am I alone? I hear weird popping in my knees when I squat.  Anyone else?
404241
It's like cracking your knuckles. It's cardon dioxide released from your joints. Totally harmless.
993508
Its scared of getting knocked around between your knees!!! Dont listen to those other guys...I am correct!!!
959189
I am 41, I started to have problems with my knees after my son was born (37). I went to the Doctor for the same problem. He stated in a healthy knee, your knee cap will glide seamlessly across the joint, you have a grove in the center and when your muscular structure begins to  weakening the knee caps will dig new groves. This causes the crunchy, grinding sounds. He suggested to do isometric exercises to improve muscular strength and get it back on track. Hope this helps before you end up in pain as I was when I went to my doctor.
897734
Had to laugh at your expense, but I guess I owe you a serious answer.  One idea is that you could have overstreched your bum muscles (glutes) from lifting too many weights such as squats.  Did you help someone move recently and have to squat a lot?\n\nAnother idea is that you shoveled and twisted.  This is the kind of action like shoveling snow.  Lifting something heavy and twisting will hurt your bum/back muscles.\n\nI seriously had this pain while working in a foundry and went to massage therapist to get it worked out.  It still bothers me from time to time.  Go get it properly scanned if the pain continues.
688651
I've walked on treadmills for years. I STILL have to hang on. I am clumsy. No matter how slow I go, they make me kinda dizzy...maybe we should start a club -\n treadmill-hanger-on-ers-for life! :)
587408
OMG are we supposed to be wearing pants for this stuff?  Why did nobody tell me?\nI am so embarrassed now
956795
Good old fashion squats. The key is to push up with your heels after you squatted. It works the butt and the back of your thighs. Or you can climb up and down the stairs 5 times. Both are free :)
845296
sounds like a pinched nerve
761821
You're overdoing it. Be sure to do as much as you can without hurting yourself. Try to do a long set. You may have a hernia. Better get it checked out.
676593
As you move your joints you can cause a vaccuum to form in the fluid between the bones. This creates a bubble and when it pops you hear the cracking noise.\nThe cartliage rubbing together on the end of the bones is also a noisy affair.
295757
Do you have more than one? If you do, you probably have shin splints. I have tons of them up and down the front of my legs. They almost feel like little beebee's that you put in a beebee gun. A lot of athletes have them. I have them from sports and cheerleading. You can also get them from wearing high heels and platforms. Then again, I'm not a doctor and can't diagnose your problem. If I had to guess though, I would say that you had shin splints. I would make an appointment with your doctor just to be on the safe side. Don't worry too much though...your leg isn't going to fall off or anything!
946782
Sounds like a neuropathy (nerve impingement).  I have the same thing and it is a diabetic neuropathy.  I know, it does drive you crazy.  I sometime put pressure on it with my other foot or massage it and it helps a little.
1159531
after getting knee pain...
292539
i have double jointed hips.  and a dimple in my butt.  probably tmi, but you asked.
875134
I bet if you stand straight, your feet flare lateraly.  This is putting stress on the MCL.  Also, the fact that you don't do any strengh training that works your legs could be the very reason your knees hurt.  What do I mean, well, the way you walk, your posture, if you run on concrete, could all cause your knees to hurt.  The best way to keep them healthy is to make sure you use new shoes (esp if you run), try orthotics (will help to correct your standing and walking posture), Have someone evaluate your GAIT(and orthapedic dr. will not do any of this) and start working out your legs.  I love watching people in the gym abuse their upper body, but neglect their legs.  Then never wear shorts at the gym.  Large upper body, spindily little legs.  If you work your legs, your muscles will protect your joints.  I love the argument that "lifting legs will make you slow"  Look at olympic sprinters legs.  Then try to tell me they don't do squats, deadlifts, etc.  Yes, working out legs is hard work, but why are you in the gym.  Squats, deadlifts, Calves, quads.  Get working on it.  Make sure someone who knows what they are doign shows you how to prevent injury.  Squats are great, with proper form, deadlifts and ab work will protect you low back, Quads and hams will help with knees and low back.  Plus, get good with squats and make the meatheads in the gym jealous because they wished they could be that strong.  At 180 lbs, I can squat over 400 lbs and I do not have an ounce of back or knee pain.  Have fun.
318590
Another yes here! I am always very scared about my knees 'dislocating' or 'popping out' on me. I tend to 'waddle' when I walk and wear shoes with good grip. Just be careful, take your time and if need be, give youself extra time to get from A to B in the snow!
810477
Checked out your question to see if there was an explanation to what this is; no a karate do myself.  Got kicked on the end of the fingers 'again' today so might be in a better mood tommorow for discussions, look forward to reading your answers.