The image shows a striking comparison between a relatively normal knee joint and a severely abnormal joint with destructive changes inside the bone. While dramatic medical illustrations can be eye-catching, they should not be interpreted as proof that a particular habit—such as a sleeping position causes bone damage or cancer. Instead, the image is useful for understanding how different diseases and injuries can affect the bones and joints, sometimes long before the problem becomes obvious.
At first glance, the difference is difficult to miss.
On one side, the knee joint
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