Extremity Amputation Research Articles

Trends in Peripheral Artery Disease, Lower Extremity Revascularization, and Lower Extremity Amputation in Incident Type 2 Diabetes: A Danish Population-Based Cohort Study.

To examine trends in peripheral artery disease (PAD), lower-extremity (LE) revascularization, and LE amputation in patients with incident type 2 diabetes. This cohort study included patients in Denmark diagnosed with type 2 diabetes in 1996-2015 and followed until 2020. Patients were age and sex matched with as many as three general population individuals. Outcomes comprised 5-year cumulative incidences of first-time PAD, LE revascularization, and LE amputation. Age- and sex-adjusted hazard ratios (aHRs) were computed using Cox regression. The cohort comprised 349,454 patients with incident type 2 diabetes (53% male; median age 62 years) and 1,025,054 general population individuals. Among patients with diabetes, decreases in 5-year cumulative incidence of PAD (from 6.2 to 3.4%; aHR 0.55 [95% CI 0.52-0.57]), LE revascularization (from 0.8 to 0.6%; aHR 0.80 [95% CI 0.71-0.90]), and LE amputation (from 1.0 to 0.4%; aHR 0.45 [95% CI 0.40-0.51]) occurred from 1996-2000 to 2011-2015. LE amputation decreased at all amputation levels (hip/thigh, knee/lower leg, and ankle/foot/toe) during the study period. In the general population, 5-year cumulative incidence remained stable (1.2-1.5% for PAD, ∼0.4% for LE revascularization, and ∼0.2% for LE amputation). However, the relative rates of all outcomes were two- to threefold higher in patients with diabetes than matched individuals in 2011-2015. In recent decades, the cumulative incidence of LE complications substantially decreased in patients with incident type 2 diabetes while remaining stable in the general population.

Survival rate of diabetic-related lower extremity amputees in hospitals in the Eastern Cape

Background: Diabetes mellitus (DM) is a global health concern that has greatly affected South Africa. The gap in the current management of DM has resulted in complications such as lower extremity amputations (LEAs) and death. Eastern Cape province reflects this struggle, with disparities in access to healthcare and poor health outcomes. Understanding survival rates and associated factors between the urban Livingstone Hospital and the rural Nelson Mandela Academic Hospital can improve health interventions and outcomes.Objectives: This study compared the survival rate of patients in urban areas and those in rural areas.Method: This retrospective cohort study was conducted in an urban and a rural hospital by reviewing existing medical records of diabetic patients who underwent an LEA between 2016 and 2019.Results: The retrospective cohort study examined 439 diabetic-related LEA cases. This study found that residing in rural areas significantly decreased the risk of mortality by 62% compared with living in the urban areas. Factors such as haemoglobin A1c (HbA1c) levels, nephropathy, cardiovascular disease, human immunodeficiency virus (HIV), other comorbidities and level of amputation significantly influenced survival probabilities.Conclusion: Survival analysis indicated a significant difference in the 3-year survival probabilities of the two groups, favouring rural residency (p = 0.001). The biggest cause for concern between the two regions was uncontrolled blood glucose levels as this resulted in high mortality rates.Contribution: Insights from this study have shown that introducing podiatry and orthotics at primary healthcare (PHC) could improve foot care and reduce diabetic-related LEAs and mortality.

Pregnancy after amputation: A national survey of prosthetic and mobility outcomes in women with lived experience

Background: In pregnancy, women with limb loss or deficiency or lower extremity amputations (LEAs) may experience physiologic changes affecting mobility, prosthesis use, and/or pain. However, little is known about the pregnancy-related experiences of these women. Objective: The objective of this research was to characterize pregnancy-related experiences including complications, impact on prosthesis use, gait aid use, and mobility for women with LEAs. Study Design: A national, self-administered online survey. Data were analyzed using descriptive statistics. Thematic analyses were performed on open-ended questions. Participants were women with 1 or more LEA(s) who had been pregnant within the last 5 years and were recruited via social media, LEA clinics, and word of mouth. Results: Sixteen women from 4 Canadian provinces completed the survey describing 31 pregnancies. A total of 9 had acquired LEAs and 7 had congenital LEAs. All but 1 respondent had unilateral LEAs; most common level was transfemoral (38%). All wore a prosthesis daily and were K-level 4 ambulators. Five (31%) had to decrease or stop prosthesis use, and 6 (25%) required a gait aid or wheelchair during pregnancy. The most common pregnancy-associated complications were low back pain (64%), changes to limb size/prosthesis comfort (64%), reduced balance (44%), falls (38%), and postpartum depression (25%). Conclusion: This survey is the first to describe the many unique challenges women with LEAs may experience in pregnancy and highlights important information for women with LEAs, their health care providers, their rehabilitation team, and avenues for future research.

Analyzing research trends and developments in osseointegration in patients with extremity amputations: Systematic bibliometric analysis and research recommendations.

Bone-anchored protheses (BAPs) by means of osseointegrated implants are increasingly being used in amputees with socket-related issues. Clinical advancements are being published by more and more centers worldwide. Although the number of publications and interest in BAP is growing, a systematic evaluation of scholarly output is lacking. To identify scholarly output, understand research trends and make research recommendations in the clinical field of BAP. Systematic searches in Medline All, Embase, Web of Science Core Collection, Cochrane Library, and Google Scholar were completed in February 2023. The results were deduplicated, screened, and assessed for quality by independent reviewers. Inclusion criteria were as follows: clinical studies and BAP in the extremities. Articles were excluded if they were animal or fundamental studies, nonclinical reports, had a study population less than 10 patients, or BAP was performed in areas other than extremities. One hundred twelve articles were included and published between 1993 and 2023. An annual growth rate of 10.3% was found and research was published in 62 different journals. Prosthetics and Orthotics International, Clinical Orthopaedics and Related Research and The Bone & Joint Journal were the most prolific journals. Hagberg K, Aschoff HH, and Branemark R were major contributors to BAP research. Collaborations are predominantly among high-income countries. Main research trends were on rehabilitation, questionnaires, complication managements, and implant treatment. Research on BAP shows an increasing global trend, highlighting key research areas and authors. A unified global research agenda, stakeholders' collaborations, and consensus are essential for addressing knowledge gaps and development future direction of BAP.

The MangLE score: A novel simple tool to identify patients who are unlikely to require amputation following severe lower extremity injury.

There are no validated and sensitive models that can guide the decision regarding amputation in patients with mangled lower extremities. We sought to describe a simple scoring model, the Mangled Lower Extremity (MangLE) score, which can predict those who are highly unlikely to need an amputation as a means to direct resources to this cohort. This is a retrospective study using the 2013-2021 American College of Surgeons Trauma Quality Improvement Program data set. Adult patients with a mangled lower extremity, defined as a crush injury or a fracture of the femur or tibia combined with severe soft tissue injury, arterial injury, or nerve injury, were included. Patients who suffered a traumatic lower extremity amputation, underwent amputation within 24 hours of admission, or who died within 24 hours of admission were excluded. Patients were divided into those who did/did not undergo amputation during their hospital stay. Demographics, injury mechanism, Injury Severity Score, and Abbreviated Injury Scale score, initial vital signs, and comorbid conditions were abstracted. A logistic regression model was constructed and the top five most important variables were used to create the score. The study includes 107,620 patients, of whom 2,711 (2.5%) underwent amputation. The five variables with the highest predictive value for amputation were arterial injury, lower-extremity Abbreviated Injury Scale score of ≥3, crush injury, blunt mechanism, and shock index. The lowest possible MangLE score was 0, and the highest was 15. The model demonstrated an excellent predictive ability for lower extremity amputation in both the development and validation data set with an area under the receiver operating characteristic curve of 0.81 (95% confidence interval, 0.80-0.82) and 0.82 (95% confidence interval, 0.81-0.84), respectively. The negative predictive value for a score of <8 is 99%. The MangLE score is able to identify patients who are unlikely to require amputation. Resources for limb salvage can be directed to this cohort. Prospective and Epidemiologic; Level IV.

An environmental scan of limb loss rehabilitation centers across Canada.

The clinical landscape of limb loss rehabilitation across Canada is poorly delineated, lacks standard rehabilitation guidelines, and is without a shared clinical database. To address these gaps, the objective of the present study was to undertake an environmental scan of the rehabilitation centers across Canada that provide inpatient and/or outpatient services to the limb loss community. An environmental scan was conducted to describe the rehabilitation service structure, program services, and outcome measures of sites across Canada. A survey was sent to 36 rehabilitation centers providing care to people with amputations. Of the 36 centers, 31 completed the survey (11 = Ontario; 8 = Quebec; 6 = British Columbia; 2 = Saskatchewan; 2 = New Brunswick; 1 = Alberta; 1 = Manitoba). Twenty-five provided both inpatient and outpatient services, 1 provided inpatient care only, and 5 provided only outpatient services. Interprofessional services were provided to a wide range of upper extremity amputation and lower extremity amputation patient populations. Range of motion was the most commonly collected outcome for both patients with upper extremity amputation and lower extremity amputation. With regard to prosthetics and orthotics fabrication, 9 of the sites had these services on-site while 15 had off-site fabricators, 6 had both, and 1 provided no response. Our findings highlight that limb loss rehabilitation and prosthetic care delivery is variable across Canada with respect to clinical team members, locations of services, and complementary services such as mental health treatments and peer support groups.

Investigating Nonadherence in an Integrated Diabetic Limb Salvage Programme: Reasons, Associated Factors, and Impacts on Care Outcomes.

Adherence to treatment plans is crucial for patients with diabetic foot ulcers (DFUs) to achieve positive outcomes. With limited understanding of nonadherence and its impacts on care outcomes, this study aimed to explore the reasons and factors associated with nonadherence in an integrated diabetic limb salvage (DLS) programme and evaluate its effects on care outcomes. This study included 2798 DFU patients who were enrolled in an integrated DLS programme across multiple institutions in central and northern Singapore from 2020 to 2021. Reasons for nonadherence were obtained via telephone interviews. Factors associated with nonadherence were identified using multiple logistic regression. Differences in one-year outcomes, including minor and major lower extremity amputation (LEA), mortality, LEA-free survival, and healthcare utilisation between adherent and nonadherent patients, were examined based on a significance level of P < .05. Nonadherence was observed in 40.2% of patients, with higher rates among younger patients, Malays and Indians, and those with higher HbA1c levels. Patient-related factors were the most commonly reported reasons for missed appointments (50.4%). Compared to adherent patients, nonadherent patients exhibited a relatively higher minor LEA rate (13.0% vs 10.2%, OR = 1.18, 95% CI: 0.93, 1.51), lower mortality rate (8.6% vs18.1%, OR = 0.50, 95% CI: 0.39, 0.65), higher overall LEA-free survival (76.4% vs 71.1%, OR = 1.27, 95% CI: 1.06, 1.53), and more hospitalisations (IRR = 1.22, 95% CI: 1.11, 1.33) and emergency visits (IRR = 1.27, 95% CI: 1.16, 1.39). While nonadherent patients showed relatively higher minor LEA rates and more healthcare utilisation, they also exhibited lower mortality and higher LEA-free survival. This suggests that nonadherence in this population may be associated with complex patient characteristics and behaviours that warrant further investigation to tailor interventions effectively.

Surgical Complications after Targeted Muscle Reinnervation at a Safety-Net Hospital.

Targeted muscle reinnervation (TMR) and regenerative peripheral nerve interface (RPNI) can reduce neuroma formation and phantom limb pain (PLP) after lower extremity (LE) amputation. These techniques have not been studied in safety-net hospitals. This study aims to examine the surgical complication rates after TMR and/or RPNI at an academic safety-net hospital in an urban setting. This was a retrospective review of patients older than 18 years who had prior above-knee guillotine amputation (AKA) or below-knee guillotine amputation (BKA) and underwent stump formalization with TMR and/or RPNI from 2020 to 2022. Demographics, medical history, and operative and postoperative characteristics were collected. The primary outcome was any surgical complication, defined as infection, dehiscence, hematoma, neuroma, or reoperation. Univariate analysis was conducted to identify variables associated with surgical complications and PLP. Thirty-two patients met the inclusion criteria. The median age was 52 years, and 75% were males. Indications for amputation included diabetic foot infection (71.9%), necrotizing soft tissue infection (25.0%), and malignancy (3.1%). BKA was the most common indication for formalization (93.8%). Most patients (56.3%) had formalization with TMR and RPNI, 34.4% patients had TMR only, and 9.4% had RPNI alone. The incidence of postoperative complications was 46.9%, with infection being the most common (31.3%). The median follow-up time was 107.5 days. There was no significant difference in demographics, medical history, or operative characteristics between patients who did and did not have surgical complications. However, there was a trend toward higher rates of PLP in patients who had a postoperative wound infection (p = 0.06). Overall complication rates after LE formalization with TMR and/or RPNI at our academic safety-net hospital were consistent with reported literature. Given the benefits, including reduced chronic pain and lower health care costs, we advocate for the wider adoption of these techniques at other safety-net hospitals.

Twenty-year trends in peripheral artery disease, lower extremity revascularization, and lower extremity amputation in newly diagnosed type 2 diabetes

Abstract Background Trends in risk of lower extremity complications in patients with newly diagnosed type 2 diabetes (T2DM) are largely unexplored. Purpose To examine the 5-year risk trends of peripheral artery disease (PAD), lower extremity revascularization (LER), and lower extremity amputation (LEA) in patients with newly diagnosed T2DM over a 25-year study period. Methods We conducted a cohort study that included all patients in Denmark diagnosed with T2DM from 1996 to 2015, who had no prior hospital diagnosis of atherosclerotic cardiovascular disease. These patients were age- and sex-matched with up to three comparisons from the general population. Individuals were assigned to 5-year calendar periods based on their year of inclusion and were followed for 5 years. The primary outcomes were the 5-year risks of PAD, LER, and LEA. Age- and sex-adjusted hazard ratios (aHR) were computed using Cox regression analysis. Results The study cohort consisted of 288,825 newly diagnosed T2DM patients (52% males; median age 61 years) and 782,232 comparisons from the general population. From 1996-2000 to 2015-2020, the 5-year risk of PAD decreased from 2.2% to 1.2% (aHR 0.56 [95% CI 0.52-0.61]), LER from 0.7% to 0.5% (aHR 0.73 [95% CI 0.63-0.84]), and LEA from 1.0% to 0.4% (aHR 0.44 [95% CI 0.38-0.50]) in T2DM patients (Figure). Compared with the general population, the 5-year risk differences decreased from 1.4% to 0.5% for PAD, from 0.4% to 0.2% for LER, and from 0.8% to 0.3% for LEA. The distribution of LEA types (hip/thigh, knee/lower leg, or ankle/foot/toe amputation) remained largely stable over time in T2DM patients. Use of prophylactic cardiovascular medications in T2DM patients increased notably during the study period, especially use of statins (5% to 50%) and multiple antihypertensive drugs (18% to 33%). Conclusions Over recent decades, the risks of PAD, LER, and LEA have decreased in patients with newly diagnosed T2DM, approaching the risk levels observed in the general population. This coincided with a great increase in use of prophylactic cardiovascular medications among T2DM patients.Trends in lower extremity complications.

Comparison of Patient-Reported Outcomes after Local Flap Coverage versus Amputation for Complex Lower Extremity Trauma

Abstract Background There is a paucity of patient-reported outcomes (PROs) data in lower extremity salvage. Limb salvage can often be achieved with the use of local muscle flaps or fasciocutaneous flaps. The purpose of this study was to compare PROs of patients who underwent lower extremity salvage using local fasciocutaneous flaps or muscle flaps to lower extremity amputation. Materials and Methods The outcomes of 61 patients that underwent lower extremity local flap reconstruction (n = 33) or amputation (n = 28) between 2014 and 2020 were recorded. Chart reviews were performed to collect perioperative data. Patients were contacted via telephone for participation in the survey portion of our study. PROs were recorded utilizing both the Lower Extremity Functional Scale (LEFS) and the 36-Item Short-Form Health Survey (SF-36). Results Surveys were completed by 61 patients (response rate 59.2%). The mean time of survey after flap reconstruction or amputation was 2.7 ± 1.4 years. Recent trauma (within 90 days) was the most common indication for local flap coverage (n = 23). LEFS score and SF-36 physical functioning scores were significantly lower in patients who underwent muscle flaps compared with fasciocutaneous flaps (p = 0.021 and p = 0.022). Muscle flap patients had similar LEFS and SF-36 scores to amputation patients, while fasciocutaneous flap patients had significantly higher LEFS (p = 0.01), SF-36 physical functioning (p = 0.031), physical role functioning (p = 0.031), and emotional role functioning (p = 0.047) scores than amputation patients. Conclusion Patients who underwent local fasciocutaneous flaps for limb salvage reported higher PRO scores than those undergoing amputation, while patients undergoing muscle flaps reported outcomes similar to those undergoing amputation. PROs for muscle flap patients were significantly lower than those of fasciocutaneous flap patients. These data suggest that while fasciocutaneous and muscle flaps are both useful limb salvage procedures, fasciocutaneous flaps may confer advantages that result in improved patient-perceived outcomes. Further study is needed to better characterize outcomes in limb salvage.

Electrophysiological Signal Validation of Regenerative Peripheral Nerve Interface at Nerve Ending: A Preliminary Rat Model Experiment.

As the number of extremity amputations continues to rise, so does the demand for prosthetics. Emphasizing the importance of a nerve interface that effectively amplifies and transmits physiological signals through peripheral nerve surgery is crucial for achieving intuitive control. The regenerative peripheral nerve interface (RPNI) is recognized for its potential to provide this technical support. Through animal experiment, we aimed to confirm the actual occurrence of signal amplification. Rats were divided into three experimental groups: control, common peroneal nerve transection, and RPNI. Nerve surgeries were performed for each group, and electromyography (EMG) and nerve conduction studies (NCS) were conducted at the initial surgery, as well as at 2, 4, and 8 weeks postoperatively. All implemented RPNIs exhibited viability and displayed adequate vascularity with the proper color. Clear differences in latency and amplitude were observed before and after 8 weeks of surgery in all groups (p < 0.05). Notably, the RPNI group demonstrated a significantly increased amplitude compared with the control group after 8 weeks (p = 0.031). Latency increased in all groups 8 weeks after surgery. The RPNI group exhibited relatively clear signs of denervation with abnormal spontaneous activities (ASAs) during EMG. This study is one of few preclinical studies that demonstrate the electrophysiological effects of RPNI and validate the neural signals. It serves as a foundational step for future research in human-machine interaction and nerve interfaces.

Descriptive Analysis of Types and Diagnoses Associated with Lower Extremity Amputation: Analysis of the US Veterans Health Administration Database 2019-2023.

Veterans in the US have higher rates of lower extremity amputation (LEA) compared to the general population and these rates have increased between 2008 and 2018. There is limited data which directly evaluate the potential underlying comorbidities associated with LEA in the veterans' population especially with the most recent data. Such information is critical to help inform clinical management strategies to reduce the risk of amputations among our veterans. This was a retrospective observational study of adults in the Veterans Health Administration database who underwent LEA from January 1, 2019 to December 31, 2023. The date of the first LEA procedure was defined as the index date. Index LEA type, patient demographic at baseline, and clinical characteristics (including diagnoses for conditions associated with LEA and other comorbidities) 1year before and 30days after the index LEA procedure (except for bacterial infections which the identification period was 30days before and 30days after the index LEA procedure) were described. Of the 27,134 Veterans with LEA, 67.3% were ≥ 65years of age, 97.0% were male, and 65.3% were non-Hispanic white. The most common type of LEA was transmetatarsal (52.9%), followed by toe (21.9%), above-knee (15.4%), and below-knee (9.8%). The most prevalent diagnoses associated with LEA were diabetes (81.6%), bacterial infections (79.1%), and peripheral artery disease (PAD; 63.3%). Only 15 Veterans (< 0.1%) had a diagnosis for combat-related injuries to lower extremities. Diabetes and PAD are highly prevalent and among the main conditions associated with LEA among US Veterans. Earlier and more effective preventative and clinical management of these conditions offer an opportunity to significantly reduce the rates of LEA in this population.

The Role of Intravascular Ultrasound in Limb Salvage: A Systematic Review and Meta-Analysis.

The purpose of this study was to review the current literature of intravascular ultrasound (IVUS) use in real world cohorts inclusive of chronic limb threatening ischemia (CLTI) patients and compare the outcomes to patients imaged by angiography alone. The systematic review was registered in Research Registry. A literature search was performed across 4 databases: PubMed, Medline/Embase, Cochrane Review, and Web of Science for eligible comparative studies. The primary outcomes examined were clinically driven target lesion revascularization (CD-TLR), amputation (including minor below the ankle and major above the ankle), all-cause mortality, limb salvage and mean balloon dilation. A random effects model was used when pooling outcomes to account for heterogeneity. Publication bias was determined using eggers test and illustrated on a funnel plot. Six studies were included in this review, with a total of 1883 subjects with Rutherford 1-6. Among the 1883 subjects, 940 had Rutherford 4-6. IVUS was used in 1294 subjects and angiography alone was used in 589 subjects. Pooled analysis determined no significant association in IVUS + angiography with CD-TLR (O.R = 1.43 [CI: 0.80, 2.58]), all-cause amputation (O.R = 0.63 [CI: 0.34, 1.17]), and all-cause mortality (O.R = 0.63 [CI: 0.34, 1.17]). Sub analysis of subjects with CLTI, Rutherford classes 4-6 showed an association between IVUS + angiography use with limb salvage at 1 year, O.R = 2.22 [1.24, 3.97]. The use of IVUS + angiography compared to angiography alone showed larger reference vessel diameter in both all-inclusive Rutherford classifications and the CLTI subset. The use of IVUS + angiography compared to angiography alone showed no difference in CD-TLR at 12 months, lower extremity amputation, and all-cause mortality for Rutherford 1-6. The use of IVUS + angiography compared to angiography alone in the CLTI subset analysis improved limb salvage.

6663 Amputation Rate in Hospitalized Patients With Diabetic Foot Ulcer at Montefiore Medical Center, Bronx, NY

Abstract Disclosure: R. Lopez Fanas: None. A. Herrera Chancay: None. H. Tabassum: None. J. Milosavljevic: None. S. Xu: None. J. Daily: None. A.K. Myers: None. Introduction: Diabetic foot ulcers (DFU) are associated with poor outcomes including lower extremity amputations and death in individuals with diabetes. Our study aims to define health outcomes and explore the association of sociodemographic and clinical factors on amputation rates in patients hospitalized with DFU addressing an existing knowledge gap in our population. Methods: This was a retrospective review of the electronic health record of adult patients hospitalized with DFU at one of the three major Montefiore Medical Center hospitals in the Bronx, New York between 06/01/2016 and 05/30/2021. Patient data extracted from the index admission included demographics, comorbidities, and laboratory values. Survival and amputation rates were calculated for each patient over the five-year study period. Results: In our analysis of 650 patients, 88% self-identified as non-white, and only 23% had commercial insurance. The amputation rate during the initial DFU admission was 44%, with 76% experiencing at least one amputation over five years. Male sex, low BMI, and smoking were associated with amputation during the study period, with an OR of 0.62 (p=0.01), 0.98 (p=0.05), and 1.45 (p=0.05) respectively. Patients with history of osteomyelitis had a higher risk of any amputation during the index admission (OR 2.05, p&amp;lt;0.0001), and the 5-year study period (OR 3.03, p&amp;lt;0.0001). PAD or prior history of amputation increased the risk of any amputation during the study period, OR 2.11 (p=0.0002) and OR 7.92 (p&amp;lt;0.001) ESRD was associated with a higher risk of AKA and BKA during the index admission (OR 2.31, p=0.05). Elevated ESR, CRP, WBC, and low albumin were associated with amputation during admission, with ORs of 1.01 (p=0.0006), 1.05 (p&amp;lt;0.0001), 1.11 (p&amp;lt;0.0001), and 0.41 (p&amp;lt;0.0001), respectively. Discussion: This study revealed a 44% amputation rate during the initial DFU admission, with 76% experiencing at least one amputation within five years. Bivariate analyses identified male sex, lower BMI, and smoking as correlated with a heightened amputation risk, consistent with previous studies. Prior amputation, PAD, ESRD, and osteomyelitis were also associated with an increased risk. Multiple regression analysis found significant associations between elevated ESR, CRP, WBC, and low albumin with amputations. As a result, interventions need to be devised for patients with these characteristics to prevent this high rate of amputation. Presentation: 6/2/2024

Preventive interventions for diabetic foot ulcer adopted in different healthcare settings: A scoping review protocol.

Diabetic foot ulcers are challenging to heal, increase the risk of lower extremity amputation, and place a significant burden on patients, families, and healthcare systems. Prioritizing preventive interventions holds the promise of reducing patient suffering, lowering costs, and improving quality of life. This study describes a scoping review protocol that will be used to delineate the preventive interventions for diabetic foot ulcers employed in different healthcare settings. The scoping review methodology was formulated in accordance with the PRISMA extension guidelines for scoping reviews and informed by the procedural insights provided by the JBI methodology group. Studies with participants diagnosed with type 1 and type 2 diabetes, aged 18 years or older, without an active ulcer at baseline, and studies of preventive interventions for foot ulcers in various healthcare settings will be screened. The search strategy was developed in collaboration with a research librarian using the PRESS checklist and no time or language limitations were applied. Data will be analyzed and summarized descriptively, including characteristics of studies, participants, and interventions. Understanding the strategies and gaps in diabetic foot ulcer prevention is critical. The literature can provide valuable insights for developing tailored interventions and strategies to effectively address these gaps, potentially accelerating progress toward improved outcomes in diabetic foot ulcer prevention. Open Science Framework DOI 10.17605/OSF.IO/FRZ97 [June 19, 2023].

Dynamic Perioperative Platelet Activity and Cardiovascular Events in Peripheral Artery Disease

ObjectivePatients with peripheral artery disease (PAD) undergo lower extremity revascularization (LER) for symptomatic relief or limb salvage. Despite LER, patients remain at increased risk of platelet-mediated complications, such as major adverse cardiac and limb events (MACLE). Platelet activity is associated with cardiovascular events; yet little is known about the dynamic nature of platelet activity over time. We therefore investigated the change in platelet activity over time and its association with long-term cardiovascular risk. MethodsPatients with PAD undergoing LER were enrolled into the multicenter, prospective Platelet Activity and Cardiovascular Events (PACE) study. Platelet aggregation was assessed by light transmission aggregometry (LTA) to submaximal epinephrine (0.4μ M) immediately prior to LER, and on post-operative day 1 or 2 (POD1) and 30 (POD30). A hyperreactive platelet phenotype was defined as >60% aggregation. Patients were followed longitudinally for MACLE, defined as the composite of death, myocardial infarction, stroke, major lower extremity amputation, or acute limb ischemia leading to reintervention. ResultsAmong 287 patients undergoing LER, mean age was 70 ± 11 years, 33% were female, 61% were white, and 89% were on baseline antiplatelet therapy. Platelet aggregation to submaximal epinephrine induced a bimodal response; 15.5%, 16.8%, and 16.4% of patients demonstrated a hyperreactive platelet phenotype at baseline, POD1, and POD30, respectively. Platelet aggregation increased by 18.5% (P=0.001) from baseline to POD1, which subsequently returned to baseline at POD30. After a median follow-up of 19 months, MACLE occurred in 165 (57%) patients. After adjustment for demographics, clinical risk factors, procedure type, and antiplatelet therapy, platelet hyperreactivity at POD1 was associated with a significant hazard of long-term MACLE (aHR 4.61, 95% CI 2.08-10.20, P<0.001). ConclusionAmong patients with severe PAD, platelet activity increases following LER. Platelet hyperreactivity to submaximal epinephrine on POD1 is associated with long-term MACLE. Platelet activity following LER may represent a modifiable biomarker associated with excess cardiovascular risk.

Protective effect of regular physical activity against diabetes-related lower extremity amputation.

Foot ulcers are a major complication of diabetes mellitus that increase morbidity and mortality in patients with diabetes, affect their quality of life, and increase the overall social burden. A considerable number of patients with diabetic foot ulcers (DFUs) require amputations every year. This nation population-based study included 1 923 483 patients with diabetes who underwent regular health screening through the National Health Insurance Service during January 2009 and December 2012. We investigated the association between changes in physical activity (PA) status and the incidence of lower extremity amputation (LEA). Based on changes in PA status, participants were categorized into four groups: "remained inactive," "remained active," "active-to-inactive," and "inactive-to-active." Regular PA is an independent factor associated with a decreased risk of LEA in patients with diabetes. During the follow-up period, 0.23% (n = 4454) of the patients underwent LEA. Compared with the "remained inactive" group, the "remained active" group were at the lowest risk of LEA (adjusted hazard ratio 0.5888; 95% confidence interval 0.524-0.66). A protective effect of regular PA against LEA was observed in the "remaining active" group. Our findings suggest a protective role of PA against LEA in individuals with diabetes. This highlights the importance of recommending appropriate levels of PA for patients with diabetes. The study also showed a dose-response relationship, indicating that engaging in vigorous-intensity PA was most beneficial, and higher amounts of PA may provide additional benefits.

Diagnóstico de la diabetes mellitus tipo 2. Situación epidemiológica, características de los pacientes, factores de riesgo y pronóstico

Type 2 diabetes mellitus (DM2) is one of the most prevalent chronic diseases. It accounts for approximately 90% of diabetes cases worldwide. This disease is characterized by insulin resistance and the progressive dysfunction of pancreatic beta cells, resulting in chronic hyperglycemia. In recent decades, the prevalence of DM2 has increased considerably due to changes in lifestyles, population aging, and urbanization. The complications associated with DM2, such as retinopathy, nephropathy, neuropathy, cardiovascular diseases, and lower extremity amputations, are a significant burden in terms of both healthcare and the economy. Intensive control of blood glucose and cardiovascular risk factors is crucial for preventing these complications. Early detection and effective interventions, such as lifestyle changes and pharmacological treatments, are essential in order to reduce the incidence of DM2 and its comorbidities.

What to expect following targeted muscle reinnervation/regenerative peripheral nerve interface: Pain outcomes in an amputee population

Targeted Muscle Reinnervation (TMR) and Regenerative Peripheral Nerve Interface (RPNI) have shown promise in improving and/or preventing neuropathic pain and reducing narcotic use in amputees. However, anecdotally, some patients experience an increase in pain in the first few months post-operatively. This study explored the pain trajectory of 22 upper and lower extremity amputees following their TMR and/or RPNI procedure in their first post-operative year, with a focus on the patterns of recovery the first few months. Our study found an overall decrease in the amount of pain and pain medication use at various time points post-operatively. Of note, several individuals had an increase in pain or required an increase in pain medications in the first three months. Different outcomes for patients who underwent primary versus secondary surgery were seen, which has been observed in other studies. Further prospective studies are warranted to evaluate these trends in pain after TMR or RPNI surgery in individuals with major limb amputations.

Lower extremity amputation rates in patients with chronic kidney disease: A database study comparing patients with and without diabetes mellitus

Lower extremity amputation (LEA) is one of the most feared consequences of diabetes mellitus (DM). The purpose of this study was to evaluate the impact of DM on LEA rates in patients at various stages of chronic kidney disease (CKD).A commercially available de-identified database was searched for patients undergoing LEA and for CKD patients, from 2010 to 2023. Patients with DM and patients without DM who were followed for at least 5 years were included. LEA rates were then compared for patients at all 5 CKD stages in patients with and without diabetes.Rates of all LEA were found to be significantly higher at all CKD stages for patients with diabetes (overall, minor and major LEA). Compared to patients without DM who have CKD stage 5 (end stage renal disease), patients with DM and CKD stage 5 have a 30 fold increased likelihood of undergoing overall LEA [OR 30.2 (24.48–37.19), p < 0.001], 29 fold increased likelihood of undergoing minor LEA [28.9i (22.91–36.35), p < 0.001] and 40 times fold increased likelihood of undergoing major LEA [40.1 (26.59–60.42), p < 0.001]. For all stages of CKD, independent of diabetes status, minor LEA were performed with greater frequency than major LEA. In patients with DM, LEA rates significantly increased with CKD progression between stages 2–5 with a substantial jump between stages 4 and 5 [OR 2.6 (CI 2.49–2.74), p < 0.001]. However, CKD progression between stages 1 and 2 was not significantly associated with increased LEA rates (OR 1.1 (CI 0.92–1.21), p = 0.24) in patients with diabetes.Patients with comorbid diabetes have elevated risk for LEA at all stages of CKD compared to those without diabetes.