It’s a saw. Powered by electricity. And they’re planning to use it on your arm or leg to cut off the cast that’s touching your skin.

How can this not end up a bloody disaster? In a word: resistance. And once you know the secret, you’ll hopefully be a little more relaxed when the whirring metal sawblade descends upon your body.

leg cast being removed with Stryker cast saw

Resistance is not futile

The principle making it work is very similar to something you’ve noticed in everyday life: If you try to write on a piece of paper that doesn’t have something supporting it, you won’t really be able to get very far. The paper will just bend and move, offering little resistance. But once the page is rigid, your pen or pencil can produce enough friction to mark the paper.

Also see: Cast removal: Step-by-step photos

Stryker cast cutter sawThe same general idea is in play with an oscillating cast saw. Since the sawblade only vibrates, and does not spin, skin can withstand contact without being cut (with some rare exceptions). But the inflexible cast material — plaster or fiberglass — offers a lot of resistance, and the blade can do its job.

The downsides

That resistance, however, can lead to one of the possible problems with cast-cutting: burns.

Because of the amount of friction generated (moreso with fiberglass than with plaster), the person removing your cast needs to be careful. If not a physician, ideally, he or she has been fully trained and/or is a certified orthopedic cast technician.

Less problematic, hopefully, is the fact that the vibration from the saw feels strange — and can even tickle a bit.

Also see: How do bones break?

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The history of the cast saw

The cast saw (“Plaster cast cutter”) was first patented by Homer H Stryker in the 1940s, and the most common cast cutting saw used today still bears his name: Stryker.

In his patent application, the orthopedic surgeon wrote:

My improved implement is highly efficient in the cutting of casts or other hard substances but yielding surfaces or materials are not cut or injured thereby in the event the cutter should accidentally contact the skin of a person and it does not cut fabrics or other objects unless they are supported by a fairly rigid backing.

While it’s hard to imagine that cast removal technology hasn’t improved much in 70 years or so, sometimes simplicity is the purest form of genius.

But who knows? Maybe in a generation or two, laser cast removal will be the way to go.

Until then, research on ways to help fractures heal more quickly — from stem cell therapy to electrical bone stimulation — is ongoing. If we’re really lucky, we will one day be able to heal broken bones almost instantly, Hollywood-style.

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About The Author

Nancy J Price

In addition to being the co-founder and Editor-in-Chief of Myria, Nancy J Price was one of the two original founders of in 1999, helping turn it into one of the world's top lifestyle websites for women. While serving as the site’s executive editor for twelve years, Nancy also helped launch five national newsstand magazines. A history buff, she spent her first three post-SK years creating the Click Americana website, and writing the historical fiction time travel novel Dream of Time. Although she's a fourth-generation San Francisco Bay Area native who got her start interviewing and photographing bands in Northern California during the eighties, Nancy now lives in Arizona with her four kids and her fiancé, novelist Daniel Price.

Original publication date: Apr 14, 2015

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