Real-time cine magnetic resonance imaging of the human metacarpalphalangeal joint undergoing traction. Note that the joint surfaces stay in close contact. Then, as traction forces increase, a focal area of increased signal intensity is visualized prior to the critical point where rapid joint separation occurs and cavity formation is then visualized.
Kawchuk G, Fryer J, Jaremko J, Zeng H, Rowe L, Thompson R
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<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4398549/bin/pone.0119470.s002.mp4">S1 Video</a> from <cite style="font-style:normal">Kawchuk G, Fryer J, Jaremko J, Zeng H, Rowe L, Thompson R (2015). "<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4398549">Real-Time Visualization of Joint Cavitation</a>". <i>PLOS ONE</i>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1371/journal.pone.0119470">10.1371/journal.pone.0119470</a>. <a href="https://en.wikipedia.org/wiki/PMID" class="extiw" title="w:PMID">PMID</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pubmed/25875374">25875374</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" class="extiw" title="w:PubMed Central">PMC</a>: <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4398549">4398549</a>.</cite>