A. smiling with his gold Kinetic Arm, January 2025
Case 003  ·  November 2024

A.

Romania

A 7-year-old boy from Bucharest with a congenital left arm difference. The arm took six weeks to cross the Atlantic.

Age at time 7 years old
Limb difference Left arm, congenital
Design Kinetic Arm at 55%
e-NABLE case #001396
A. showing his left residual limb, before receiving the arm

A father's request from Bucharest

The case came in through the e-NABLE platform in June 2024. A. was 7 years old. His left arm had been different since birth, a congenital limb difference that left his forearm short. His father Octavian had submitted the case himself, with careful measurements and a specific ask: a device his son could actually use.

The family had been through prosthetics before, two prior devices from e-NABLE and three from a Romanian orthopaedic clinic over the years. They knew what fit felt like, and what didn't. They came in with clear eyes.

His mother wrote to me in English. His father handled the forms. A.'s preferred colour was blue and red, "albastru cu rosu." But after evaluating the measurements, I chose the Kinetic Arm in gold and black. It was the best design for grip strength and usability. Gold is what I had. And gold had worked on Case 001.


A small arm, precisely calibrated

Measuring a 7-year-old's residual limb over WhatsApp requires patience on both ends. Octavian guided A. through the photos, arm flat on the table, ruler alongside, right angle against the surface. We went back and forth until I had what I needed. His residual limb was small enough that I wasn't certain the Kinetic Arm's wrist mechanism would generate enough leverage. The manual said it should work at these dimensions. I built it and hoped.

A.'s residual limb measured flat against a ruler, showing length Right-angle measurement on table with ruler Close-up of A.'s residual limb, tip detail
Scale 55%
Forearm ⌀ 19 cm
Arm ⌀ 21 cm
Side Left
Colors Gold & Black
Material Gold PLA + Black TPU
Palm length 13 cm
Hand length 34 cm

Built in New York, addressed to Bucharest

All parts were printed and ready by November 18, 2024. The arm assembled piece by piece, gold PLA body, black TPU accents, tensioner cords threaded through each finger joint. Every component at 55% of the standard size. It went into the shipping box on December 2 with a tracking number and a video guide for how to use it.

The finished Kinetic Arm, full side profile, gold and black, fingers extended The Kinetic Arm with wrist bent, showing the finger-closing mechanism in action Palm-side view of the finished arm, finger detail and TPU pads Side profile of the full arm, forearm shell, socket and hand
A. smiling as he grips a pink cup with his new gold arm. January 8, 2025

Six weeks in transit. It fit perfectly.

The package left New York on December 2 and arrived in Bucharest on January 8, 2025, thirty-seven days in the mail. His mother messaged the moment it came through the door: "Today A. received the kinetic arm! We are so thrilled for him! It looks just as great as we expected and most importantly, it fits him perfectly!"

He wore it to school the next morning. His classmates were impressed.

A. holding and examining his new arm, delivery day A. looking closely at the finger mechanism A. wearing the arm, full view showing fit A. smiling proudly with the arm on, January 2025

"The timing could not be better, you gave him hope for better and brighter days. He was feeling down about his left arm. We are grateful and thankful for all you've done for him. Thank you!"

, A.'s mother, Romania  ·  December 2024

He outgrew it. A new one is coming.

By February 2026, A. had grown, as 7-year-olds do over a year and a half. His mother wrote to say the arm no longer fit. He was turning 10 in July. New measurements came in February 2026: four careful photos, same meticulous approach as the first time.

His colour choice: gold again. The replacement arm is currently being built.

In the same update, his mother mentioned that A. wants to sing, he'd signed up for an audition that week. He and his father were going to start martial arts together. He likes going to school. She wrote: "That makes me proud."

He wore the arm the morning after it arrived. He's been wearing it since. That's what I built it for.

A. wearing the arm, a later photo, white shirt A. relaxed with the arm on his left side A. with the Kinetic Arm, ongoing use

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