3D-printed adaptive aids can benefit patients with arthritis

Reviewed by Kate Anderton, B.Sc. (Editor)Dec 12 2018

Adaptive aids are expensive. Additive manufacturing, using low-cost 3D printers, can save upwards of 94 percent for simple household items.

The Centers for Disease Control and Prevention (CDC) reports that almost a quarter of the U.S. population lives with some form of arthritis. Daily tasks -- like opening drawers, turning door handles -- can be difficult, so people turn to adaptive aids. Many are small pieces of plastic.

"It never ceases to amaze me what a small piece of plastic sells for," said Joshua Pearce, the Richard Witte Endowed Professor of Materials Science and Engineering at Michigan Tech. "Anyone who needs an adaptive aid for arthritis should be 3D printing it."

So, Pearce had his class take a shot. Now, Pearce is a co-author and corresponding researcher on a new study that analyzes how 20 of the 3D printed adaptive aids his class printed see huge cost savings and either meet -- or improve -- standards for existing products. The study was published this week in Geriatrics and is co-authored by student research assistant Nicole Gallup and orthopedic surgeon Jennifer Bow, who is also a visiting scholar at Michigan Tech.

Adults with arthritis and other rheumatic conditions earn less than average yet spend more on medical expenses, on average about 12 percent of the average family's income. To boot, the adaptive aids they may need to purchase to help them pull on socks, hold toothbrushes, knit, pull zippers, cut food and many other everyday tasks are pricey.

Adaptive aids range from a cheap pop can opener for $5.99 to pill splitter for $23.75 to a phone holder for $49.99. With 3D printing, those costs can come down to 45 cents to pop tabs, $1.27 to split pills and 79 cents plus a rubber band to hold a phone.

The 3D printed versions are not only cheaper but customizable. Dr. Bow recommended students take a look at designing adaptive aids because the customization available from 3D printers could help her arthritis patients and others throughout the world. Subsequently, the group Makers Making Change approached Pearce because they needed to improve some existing designs that can be shrunk, expanded, tweaked to match different hand sizes, grip strength, color preference and task modification.

"This is the difference between needing to go to someone to get your nails cut and being able to do your own, which, yes, there's cost savings, but it's also personal pride and being able to take care of yourself," Pearce said. "And if your only problem is that the standard nail clipper is too tiny, we can fix that."

Cost for individual items may not be too onerous. However, following a diagnosis, some patients need to overhaul or install many adaptive aids, like putting light switch flippers throughout the house, which adds up quickly. 3D printing can trim that cost, and Pearce's team only used printers that cost $500 or less, but the upfront cost of a printer may curb some people's enthusiasm. Also, some people do not have to pay the full price for adaptive aids if Medicare or their insurance policy helps cover the purchases. Pearce says neither substantially affects the numbers.

"We printed and analyzed 20 different products and each one has a great return on investment, even for people who can use insurance to purchase adaptive aids with a co-pay, and a printer pays for itself easily," Pearce said, explaining that the true challenge is not economic. "It's a slam dunk -- but the question becomes, how do people get these aids?"

People can save a lot having a 3D printer on their kitchen table. Not everyone is ready for the distributed manufacturing wave in their home, but there are still many ways to bring 3D printed goods to people with arthritis, particularly older patients.

"We're not saying an 85-year-old with no personal computer experience is developing a CAD from scratch and prototyping a design 12 times," Pearce said, explaining the open source designs are available for free online at

Pearce sees nursing homes, doctor's offices and physical therapy clinics as the ideal hubs for 3D printed adaptive aids. Local makerspaces and libraries also provide access to printers, designs and knowledgeable people in exchange for fees that cover plastic and printing costs; some businesses even make a living providing 3D prints.