AOPA's top research prize went to a study asking how socket pressure affects limb health

The American Orthotic and Prosthetic Association named Matthew Wernke, PhD, as one of two recipients of the 2026 Howard R. Thranhardt Award, presented at the AOPA National Assembly in Las Vegas this week. The award goes to the top clinical research abstracts submitted to the assembly each year and has become a consistent indicator of where the field sees its most pressing unanswered questions.

Wernke’s question is a practical one: how much pressure, applied where, protects limb health in a prosthetic socket?

The evidence gap

Wernke is director of research and development at Willowwood, which designs prosthetic liners and sockets. His presentation, “Defining Optimal Pressure Profiles to Protect Limb Health,” starts from an observation that should not be true: socket fit depends fundamentally on how pressure is distributed across the residual limb, yet there is almost no research evidence guiding how prosthetists actually design that distribution.

The specific question his research investigates is whether pressure should be balanced across the limb surface, or concentrated and relieved at specific anatomical areas. Both approaches appear in clinical practice, but without a rigorous evidence base to support either in terms of what happens to the patient’s limb over time.

That gap matters. Socket pressure is the interface between a prosthetic user and their device at every step. Too much pressure in the wrong location leads to skin breakdown, tissue damage, and eventually wounds serious enough to take the prosthesis off for days or weeks. Without evidence-based guidelines, socket pressure design rests largely on clinical intuition, training tradition, and manufacturer recommendations, all of which vary between practitioners.

Limb health as the measuring stick

What distinguishes Wernke’s approach is the choice of outcome variable. Rather than measuring pressure distribution as a technical endpoint, the study uses limb health as its primary differentiator: which pressure profiles correlate with better or worse skin and tissue outcomes over time.

This is a different question from asking what distribution pattern is biomechanically efficient or subjectively comfortable. Using actual limb health outcomes anchors the research in what most directly determines whether a person can keep wearing their prosthesis.

The intent is to give prosthetists a more specific target for socket design: not just what an optimal pressure profile looks like, but why, and whether it shifts based on residual limb anatomy or amputation level.

A field building its evidence base

The Thranhardt Award exists in part because the evidence base for clinical O&P practice has historically been thin compared to other medical device fields. Much of what prosthetists do developed through observation and refined craft, but not always through the kind of controlled evaluation that produces transferable guidelines. Coverage determinations at Medicare and private insurers are increasingly demanding that evidence, which creates pressure on the profession to generate it.

Wernke was not the only researcher honored this week. Mark Geil, PhD, of Kennesaw State University, received the same award for research on crawling biomechanics in infants with cerebral palsy. Both studies use real patient outcomes rather than device performance as their primary variable, which is the direction the field has been trying to move for years.

The Commitment to Outcomes Award, presented by AOPA and Hanger Clinic, went to Jeffrey Brandt, CPO, who built Ability Prosthetics and Orthotics around standardized clinical outcomes measurement before Ability was acquired by Ottobock in 2020. AOPA president Kimberly Hanson cited Brandt for demonstrating that outcomes tracking could be integrated into daily clinical practice rather than treated as a research-only exercise.

What to watch for

Wernke’s work is a research abstract at this stage. Clinical guidelines based on findings like these take time to reach training programs and practitioners. But identifying the right question and building a patient-outcomes methodology to answer it is the work that precedes those guidelines.

For patients who experience recurring skin irritation, pressure sores, or volume problems at the socket interface, the relevant development is that the field is working toward a more rigorous foundation for how fitting decisions are made. That does not translate into changes at your next appointment. It is, however, the kind of research that is supposed to change how prosthetists are trained over the next decade.

Medical information note: This article covers clinical research and does not substitute for care from your prosthetist or physician. If you are experiencing skin breakdown or pressure problems at the socket interface, contact your prosthetic provider.