There will be an obvious sense of breakthrough during bone marrow puncture. What does it mean? why?

Because the boundary between compact bone and cancellous bone is obvious, there is a sense of breakthrough.

After passing through the hard bone, there is the cancellous bone with small holes. A sense of breakthrough means that you have reached the medullary cavity and should not go deeper. No matter how deep it is, it may penetrate into the sinusoid.

If it is a patient with osteoporosis or bone sclerosis, the sense of breakthrough is not very obvious. But we know that the depth of the puncture needle into the bone marrow cavity after reaching the periosteum is about 1 cm. As long as the position and depth are correct, satisfactory bone marrow can be extracted even if there is no sense of breakthrough.

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