Additive Manufacturing

SEP 2018

ADDITIVE MANUFACTURING is the magazine devoted to industrial applications of 3D printing and digital layering technology. We cover the promise and the challenges of this technology for making functional tooling and end-use production parts.

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SEPTEMBER 2018 Additive Manufacturing CHECK THIS OUT 40 By Brent Donaldson 3D-Printed Hips Versus the World's Deadliest Mountain Last year when Romano Benet and his wife Nives Meroi reached the summit of the Anna- purna Massif—the highest peak of the Himalayas—the husband and wife mountaineering team became the first couple to climb all of the world's so-called "eight-thousanders." Of the 14 peaks on Earth that reach at least 8,000 meters, Annapurna is by far considered the deadliest. Its fatality-to-summit ratio is a staggering 34 deaths per 100 safe returns. But not only did the 55-year-olds Benet and Meroi summit the world's most danger- ous mountain together, Benet made the journey with hips anchored by two Delta Trabec- ular Titanium (TT) cups, 3D-printed by LimaCorporate on Arcam EBM Q10 machines. LimaCorporate, headquartered in Friuli Venezia Giulia, Italy, has been a customer of and partner with Arcam EBM—a GE Additive company—for more than a decade. Lima's Trabecular Titanium technology utilizes Arcam's electron beam melting process to mimic the mesh-like structure (called trabecula) of natural bone. This trabecular geometry is able to withstand the mechanical stresses that most of us—but especially athletes like Romano Benet—place on our bones during rigorous activity. Benet says that his surgeon showed him the entire 3D-printed assembly before the operation. "It was scary," Benet says, "but I had no choice at that point. He guaranteed me that I could come back to living a normal life, but not that I would come back to moun- taineering again at high levels." It turned out that Benet and Meroi saved the highest level of them all—Annapurna—for last. Read more at A close-up view of the Delta TT cups—and the carefully designed trabecluar structure that allows for bone-in growth—produced by LimaCorporate. It is believed that these implants have the potential to last well beyond the typical 10- or 15-year lifespan of a conventional implant. Romano Benet and his wife and climbing partner Nives Meroi. When the couple reached the summit of the Annapurna Massif, the team became the first couple to climb all 14 of the world's highest peaks. Benet scaled the last three peaks with 3D-printed trabecular titanium hips. A 3D-printed hip implant produced by Italian company LimaCorporate, printed on an Arcam EBM machine. This 3D-printed porous trabecular structure, which allows for the patient's bone tissue to integrate with the part and is essential to functionality of the implant, is integrated with the solid body of the part. In conventionally produced implants, these trabecular structures exist as a coating, and are thus at risk for delamination and failure.

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