Could a Custom-Fitted, 3D-Printed Hip Protector Get More Seniors to Actually Wear One?

Falls are common in residential care homes, and when an older adult lands on their hip, the consequences can be severe. Hip fractures often lead to long hospital stays, loss of independence, and in some cases, a much steeper decline in health afterward. Hip protectors — padded or shielded garments worn like underwear or inserts in special briefs — have been studied for years as a way to cushion the blow during a fall. The trouble is, they only work if people actually wear them, and many residents simply don't.

A new study protocol published in BMC Geriatrics lays out plans for a trial examining whether a more personalized approach to hip protector design can fix that adherence problem. The research team, based at institutions in Hong Kong, points to a straightforward but often overlooked issue: standard hip protectors are frequently bulky, ill-fitting, and uncomfortable, especially for older bodies with varied pelvic shapes and sizes. If a device doesn't feel right, people stop using it, no matter how protective it might be in theory.

Custom-Molded Protectors Replace the One-Size-Fits-Most Design

The proposed solution involves 3D-printed hip protectors custom-shaped to each wearer's body. Instead of a one-size-fits-most garment, participants in the intervention group would receive protectors scaled and molded to their individual pelvic dimensions, with the idea that a better physical fit might translate into people being more willing to put the device on and keep it on through the day and night.

To test this, the researchers have designed a 12-month cluster randomized controlled trial across 30 residential care homes in Hong Kong. Rather than randomizing individual residents, entire care homes will be assigned to either the intervention group, receiving the custom 3D-printed protectors, or the control group, receiving conventional hip protectors. About 10 residents per home are expected to take part, for a planned total of 300 participants.

What the Researchers Will Be Measuring

The primary focus of the trial is compliance rather than fracture outcomes directly. The team plans to track how many residents agree to use the protectors in the first place, how consistently they wear them day and night, what proportion of actual falls occur while someone was wearing the protector, and what share of residents are protected at any given time. Together, these measures will show whether a better-fitting device changes behavior in a real care-home setting.

Beyond compliance, the study will also gather secondary information, including whether hip injuries occur, any discomfort or side effects tied to wearing the protectors, the cost of supplying and maintaining them, and how residents and care staff feel about the devices. That last piece will involve interviews analyzed through thematic analysis, adding a qualitative layer to the mostly statistical design. Quantitative results will be analyzed using regression models and generalized estimating equations, statistical methods chosen specifically to account for the fact that residents are clustered within care homes rather than independently assigned.

Why Adherence Has Been the Sticking Point

This trial centers on compliance rather than simply assuming better protectors equal fewer fractures. Prior research has suggested hip protectors can reduce fracture risk when worn during a fall, but real-world effectiveness has been hampered by low and inconsistent use. A device sitting in a drawer protects no one. By focusing on acceptance and adherence as primary outcomes, this trial is addressing the gap between a technology's theoretical benefit and its practical, everyday use among older residents, many of whom may have cognitive or physical challenges that make dressing and self-care more difficult to begin with.

The researchers are careful to frame this as a protocol, meaning the trial has not yet produced results. What's been published describes the planned design, methods, and reasoning, registered with the Chinese Clinical Trial Registry ahead of enrollment. If the customized protectors do lead to meaningfully higher adherence compared with conventional versions, the authors suggest this could support wider adoption of personalized hip protection as part of fall-injury prevention strategies in care settings. But that remains a hypothesis to be tested, not a finding to act on yet.

For care homes weighing fall-prevention options, the trial's design underscores that a protector's benefit depends on residents actually wearing it, not just on its padding or materials. Decisions about adopting hip protectors for a specific resident should involve that resident's physician or care team, who can weigh individual mobility, cognitive status, and comfort needs.

Source: BMC Geriatrics, DOI: 10.1186/s12877-026-08556-7, based on the study protocol by Yang et al. describing a planned cluster randomized controlled trial of customized 3D-printed hip protectors in Hong Kong care homes.