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31

The exact mechanism is unclear. Here are some possible causes: rapid collapsing of cavities inside the joint [1]; rapid ligament stretching [1]; breaking of intra-articular adhesions [1]; escaping gases from synovial fluid [2]; movements of joints, tendons and ligaments [2]; mechanic interaction between rough surfaces [2], mostly in pathological situations ...


18

The joint you are thinking (I assume) of is not a knee, nor is it an elbow, instead it is an ankle which is bending the same way as us humans. You can see from the below diagram that the knee - the joint between the femur and tibia - is just further up the leg normally hidden by feathers. Birds have a comparatively elongated metatarsus which gives the ...


8

Is joint-cracking harmful? No. Donald Unger was told by his mother that he'd get arthritis if he cracked his knuckles so he cracked his left knuckles every day for 60 years but never his right knuckles. He had no arthritis or any other problems in either hand and got a publication (D. L. Unger, "Does knuckle cracking lead to arthritis of the fingers?", ...


6

Nobody really knows where it comes from. The currently most popular theory is that pulling the joint apart leads the gases in the joint's cartilage to accumulate and form a bubble which then pops when you let it spring back. The only thing that has been researched is whether it has an effect on the joint, but people who do it regularly don't seem to have any ...


2

As far as I remember the pathology course from medical school, chronic long-lasting inflammation often leads to proliferation of connective tussie and ultimately to fibrosis. The actual mechanism here is the lack of oxygen which is used-up by different immune system cells to produce peroxydes and superoxydes.


1

Osteoarthritis results from the gradual degradation of articular cartilage. When the cartilage is damaged extensively, e.g., all the way through the cartilage and into the bone, an inflammatory response ensues in the bone. This often happens when bone is rubbing against bone. One of bone's responses to injury and inflammation is the production of new bone. ...



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