Today’s conventional orthopedic cast dates back to the 1850s. Although minor improvements have been made over the years, casts have remained essentially the same: a combination of cloth and wet material that, once dry, completely encases a limb in order to immobilize that limb and give the bone time to heal.
Two main problems arise from this method. Firstly, encasement leads to little breathability, trapping sweat, bacteria, and heat, which often leads to discomfort, itchiness, odor, and greater chances of infection and soft tissue damage.
Secondly, traditional casts are damaged by water or excessive moisture. Because of this, patients cannot wash affected areas since doing so will ruin the structure of the cast and skin. As many clinicians know, casts often end up getting wet anyway which leads to more recasts and more office visits.

And beyond these issues, for us, the situation is personal.



Contact Us to Learn More!

Our cofounder was born with a birth defect that has resulted in over 60 casts, braces, and splints. Collectively, he has spent nearly 3 years of time in traditional casts and continues to wear leg braces every day of his life. We know the struggles of traditional cast care and needed to invent something better.

Cast21 has developed a solution to these problems with technology better than a waterproof cast. The core product, Osteon Defender, solves issues facing patients and providers and gives doctors greater visibility of the fractured area. Made of specialized polymers, our patent-pending system meets the needs of today’s lifestyles. Osteon Defender’s strong, netted structure allows light and air to reach the affected area. Patients can wash the skin around the affected area. They can shower, exercise, and even swim. Water is no longer the enemy of the cast but a welcome ally in health and healing.

We have made it our mission to provide doctors and patients with a better option that is effective, affordable, and actionable. We understand the day to day demands of orthopedic and trauma surgeons and their teams and have developed our technology to work in accord with standard operating practices. Cast21 requires no expensive equipment and application takes approximately 3-10 minutes, about the same time it takes to wrap a limb in padding and the conventional plaster or fiberglass casting.

How it Works

Our revolutionary fracture orthotic takes its design cues from structures you see every day. Bridges are often supported by trusses or cables. Buildings are held up by support beams. We use these engineering examples as our blueprint, combined with the braided structure of a helically wound braid, i.e. the “Chinese finger trap.” Once hardened, the resulting structure is designed to protect the fractured bone beneath and enable it to heal with minimal encasement and zero swathing.

Cast21 comes in different sizes. Patients are fit for Osteon Defender like they would gloves or socks. Then, patients slide their limb into a soft, malleable, sleeve. Next, a liquid solution is injected into the sleeve. This solution can cure solid in ten minutes. Once hardened, the device is set. No additional splinting, padding, or other materials are required, and patients can return to their daily activities, including workouts, as advised by their doctor.