Highlight
State-level access to registered U.S. hand trauma centers is highly uneven, with several states reporting no registered centers at all.
At a 6-hour travel catchment, 13.3% of the U.S. population lacks access to a registered hand trauma center; even at 12 hours, 7.6% remain uncovered.
Registered center density is concentrated in major metropolitan regions, whereas rural and lower-density states face the greatest barriers to timely replantation care.
The findings frame replantation access not only as a microsurgical issue, but also as a trauma systems and health equity problem.
Background
Traumatic finger and thumb amputations are time-sensitive injuries with major implications for long-term hand function, employment, disability, and quality of life. When technically feasible and clinically appropriate, replantation can restore sensibility, preserve pinch and grasp, and reduce the functional losses associated with revision amputation. Yet successful replantation depends on more than operative expertise alone. The patient must reach a capable center quickly, tissue must be appropriately preserved, ischemia time must remain acceptable, and the receiving hospital must have the microsurgical staffing and infrastructure to offer definitive treatment.
In the United States, the distribution of specialized replantation capability has long been recognized as inconsistent. Many hospitals treat hand injuries, but not all provide around-the-clock microsurgical replantation. For this reason, registered hand trauma centers serve as a practical marker of specialized access. From a systems perspective, the location of these centers matters: a technically successful operation cannot occur if the patient cannot reach the right hospital within the relevant treatment window.
The study by Hauc and colleagues addresses this operational question directly. Rather than focusing on procedural rates or postoperative outcomes, the authors examine geography itself as a determinant of access. Their analysis is especially relevant because prior work has linked longer transport distances and delays to worse outcomes in limb salvage and replantation settings. In finger replantation, prolonged ischemia and fragmented referral pathways may reduce the likelihood that patients are offered, or remain eligible for, definitive reconstructive care.
Study Design and Methods
This study was a geospatial access analysis of registered U.S. hand trauma centers. Using data from the American Society for Surgery of the Hand, the investigators mapped the locations of registered centers and applied isochrone application programming interface modeling software to estimate travel-based catchment zones. Isochrone modeling is a transportation analytics method that identifies all areas reachable from a given location within a predefined travel time or distance threshold. In this case, the authors generated shaded regions representing populations within 6-hour and 12-hour travel radii of a registered hospital center.
The analysis also examined state-level center density standardized per 1 million residents, allowing comparison between populous and less populous jurisdictions. This approach is useful because raw center counts can exaggerate access in large states and underestimate scarcity in smaller ones. By integrating geographic placement with population-adjusted density, the study offers both a systems map and a public health metric.
Based on the abstract, the study appears descriptive rather than interventional. No patient-level outcomes, case-mix variables, procedural success rates, or comparative treatment effects were reported. The principal endpoints were geographic coverage and center density, not clinical outcomes. Nevertheless, the clinical relevance is direct: travel time is being used as a proxy for the ability to obtain time-sensitive microsurgical care.
Key Findings
Marked differences in state-level center density
The District of Columbia had the highest number of registered trauma centers per 1 million residents at 1.5, followed by Oklahoma at 0.98 and Minnesota at 0.88. At the other extreme, several states, including Nevada, Montana, and Kansas, had no registered trauma centers. This contrast underscores a central point of the paper: access to specialized replantation care in the United States depends heavily on where the injury occurs.
Population-adjusted density is an important lens here. The District of Columbia’s high value likely reflects its urban concentration and proximity to multiple tertiary referral institutions. Minnesota and Oklahoma may similarly benefit from regional referral structures that support specialized hand coverage. By contrast, states with no registered centers may still have hospitals capable of managing some hand trauma, but the absence of registered facilities suggests a gap in identifiable, standardized, or publicly mapped replantation access.
Access is clustered in metropolitan corridors
Geospatial mapping showed especially dense center clustering in Houston, Texas; Indianapolis, Indiana; Columbus and Cincinnati, Ohio; and large Northeastern cities including New York, Philadelphia, the District of Columbia, and Boston, each with more than 6 hand trauma centers. These regions likely benefit from academic medical centers, higher specialist density, robust trauma referral networks, and concentrated transport infrastructure.
This urban concentration creates two simultaneous realities. In some metropolitan corridors, patients may have multiple potential referral destinations, enabling triage flexibility and possibly reducing transfer delays. In other regions, especially rural areas and low-density states, the absence of nearby registered centers may mean prolonged ground transport, multiple interfacility transfers, or default treatment at hospitals without replantation capability.
Substantial populations remain outside timely reach
The most policy-relevant result is the population-level coverage gap. At a 6-hour catchment, 13.3% of the U.S. population lacked access to a registered hand trauma center. Even when the threshold was extended to 12 hours, 7.6% remained without coverage.
These figures suggest that travel-based inequity is not a marginal issue. A 6-hour threshold is clinically meaningful because ischemia tolerance for amputated digits is finite, and delays often accumulate before definitive transport even begins. A patient’s total time from injury to revascularization includes prehospital response, on-scene management, presentation to the first facility, assessment, transfer acceptance, transport logistics, operating room readiness, and the start of microsurgery. Therefore, a nominal 6-hour travel zone may still translate into a much tighter real-world window for viability.
The persistence of a 7.6% gap even at 12 hours is also notable. Extending the threshold may capture more interregional transfer possibilities, but it does not eliminate structural isolation. This subgroup likely represents patients in remote or frontier settings where current center distribution simply does not support timely specialized access.
Clinical Interpretation
For clinicians, the study reinforces that replantation candidacy is partly determined before the surgeon ever sees the patient. Geography influences whether a patient arrives within an acceptable ischemia window, whether transfer is considered worthwhile, and whether referral occurs to a center with sufficient microsurgical expertise. In practice, hospitals without hand replantation capability may face difficult triage decisions under time pressure, especially overnight or in regions with limited transport options.
The findings are also relevant to emergency physicians, trauma surgeons, orthopedic and plastic hand surgeons, and regional transfer coordinators. A map of registered capability may help identify where transfer protocols need to be streamlined, where teleconsultation could support triage, and where public education on preservation of amputated parts may have the greatest payoff. Better prehospital identification of replantation-eligible injuries could reduce secondary delays.
Importantly, access to a center is not the same as receipt of replantation. Patient age, mechanism of injury, extent of crush or avulsion, contamination, ischemia duration, associated injuries, comorbidity burden, occupational priorities, surgeon availability, and institutional willingness all influence the final treatment decision. Even so, lack of geographic access is a fundamental upstream barrier: patients cannot receive specialized care they cannot physically reach.
Health Systems and Equity Implications
This study should be interpreted as a trauma systems analysis as much as a hand surgery analysis. The maldistribution of registered replantation centers mirrors broader U.S. patterns in specialty care, where high-acuity services cluster around population centers and academic hubs. Rural residents often bear disproportionate travel burdens for emergency surgical care, and this work adds hand trauma to that larger conversation.
Several equity concerns emerge. First, rural patients may be less likely to reach specialized care quickly enough for optimal outcomes. Second, lower-resource hospitals may lack established transfer pathways or real-time access to specialist consultation. Third, state-level absence of registered centers may place patients at the mercy of interstate referral arrangements, which can be slowed by administrative, insurance, or transport barriers.
The paper’s implications extend beyond simply opening more centers. Replantation is resource-intensive and requires specialized surgeons, anesthesia support, microsurgical instruments, operating room availability, and postoperative monitoring capacity. In sparsely populated regions, sustaining these services locally may not be feasible. Therefore, policy solutions may need to focus on regionalization, formalized referral pathways, air or rapid ground transport integration, telemedicine triage, and transparent public registries of actual 24/7 capability.
Strengths of the Study
The primary strength of this work is that it addresses a practical, understudied barrier to care using a systems-level methodology. Geospatial analysis is well suited to evaluating emergency access because it reflects real-world travel constraints better than simple straight-line distance. The use of standardized catchment thresholds and population-adjusted center density improves interpretability for clinicians and policymakers.
Another strength is the focus on registered hand trauma centers rather than on generic hospital availability. For time-sensitive reconstructive emergencies, specialization matters. A nearby hospital without microsurgical replantation capacity may not meaningfully solve the access problem. By centering the analysis on registered institutions, the study provides a more clinically relevant map of probable definitive care access.
Limitations and Cautions
Several limitations should temper interpretation. First, the abstract does not indicate whether registration perfectly corresponds to true 24/7 replantation capability. Some nonregistered hospitals may perform replantation, while some registered institutions may have variable real-time staffing. Thus, the study likely estimates access to recognized centers, not necessarily all possible providers.
Second, travel-time modeling does not capture the full complexity of emergency care. Real-world access depends on weather, traffic, ambulance availability, air transport, transfer refusal, bed status, and surgeon call coverage. A mapped 6-hour travel radius may overestimate or underestimate true operational access depending on these circumstances.
Third, the analysis is ecological. It does not link geographic exposure to patient-level outcomes, treatment rates, amputated-part characteristics, socioeconomic status, race and ethnicity, insurance status, or functional recovery. Therefore, the study identifies likely access disparities but cannot quantify how much of the national variation in replantation outcomes is directly attributable to geography alone.
Fourth, state-level metrics may obscure within-state inequality. A state containing one urban center may appear covered on paper while still leaving vast rural regions functionally underserved. The authors partly address this through isochrone mapping, but state summaries should still be interpreted cautiously.
Practice and Policy Implications
For frontline clinicians, the study supports the development of clear transfer protocols for traumatic digit amputation. Emergency departments should know in advance which centers in their region offer replantation, what acceptance criteria they use, and how amputated parts should be packaged and transported. Rapid specialist consultation, ideally via telecommunication with image review, may reduce delays and prevent unnecessary transfers.
For trauma systems planners, the data argue for better alignment between injury networks and hand surgery capability. Potential interventions include regional call-sharing arrangements, explicit designation of replantation hubs, coordination across state lines, and transport pathways tailored to ischemia-sensitive injuries.
For professional societies and accrediting bodies, the work raises a broader question: should replantation capability be more formally defined, verified, and publicly reported? A transparent national directory that distinguishes between theoretical and continuous operational capability could improve referral efficiency.
For policymakers, the challenge is to improve access without diluting quality. Because higher-volume centers may achieve better outcomes, indiscriminately dispersing low-volume services may not be ideal. A more effective model may be regionalized excellence supported by reliable transport and triage infrastructure.
Conclusion
Hauc and colleagues provide a clear and clinically important picture of the geography of replantation access in the United States. Registered hand trauma centers are concentrated in major metropolitan areas, while many states and large rural regions remain relatively underserved. More than one in eight Americans lives outside a 6-hour catchment to a registered center, and a meaningful proportion remains without access even at 12 hours.
The message is straightforward: access to digit replantation is shaped not only by surgical skill, but by geography, transport, and system design. Improving outcomes in traumatic amputation will require more than technical advances in microsurgery. It will also require smarter referral networks, better transport coordination, improved transparency about center capability, and targeted efforts to reduce rural access gaps. In this sense, replantation care is both a reconstructive challenge and a public health infrastructure challenge.
Funding and Trial Registration
No funding information or ClinicalTrials.gov registration number was provided in the abstract. As this was a geospatial observational analysis rather than a therapeutic trial, trial registration may not be applicable.
Reference
Hauc SC, Lin AC, Febre-Alemañy DA, Atayde JEP, Janis JE. A Geospatial Analysis of State-Level Access to Registered U.S. Replantation Centers. Plastic and Reconstructive Surgery. 2026-05-27;157(6):1025-1032. PMID: 42202112. Available at: https://pubmed.ncbi.nlm.nih.gov/42202112/
