Charcot arthropathy of the foot and ankle: modern concepts and management review

Mitochondrial dysfunction is the cause of one of the earliest changes seen on magnetic resonance imaging in Charcot neuroarthopathy - Oedema of the small muscles in the foot

The hypothesis laid out in this thesis states that the early changes seen on an MR imaging in those with early Charcot neuroarthopathy may be due to mitochondrial dysfunction. In a Charcot foot, there is movement between bones. In an attempt to prevent this movement, the small muscles of the foot contract continuously when the foot is weight bearing. This contraction takes energy in the form of ATP. However, the reduction of glucose transport into the muscle cells due to insulin resistance / insufficiency, leads to reduction in the ATP producing capacity of the mitochondria. The ATP depletion affects the cell membrane gradient leading to mitochondrial and cellular swelling. These early cellular changes could then be picked up with MR imaging as muscle oedema.

Charcot Neuroarthropathy Advances: Understanding Pathogenesis and Medical and Surgical Management

Understanding new theories of the epidemiology of Charcot neuroarthropathy is practice changing. Treatment of Charcot neuroarthropathy is evolving from a passive approach to one that sees the urgency of proactive, early recognition, thereby avoiding the cascading events that lead to the complex, limb-threatening deformities. Preventive medicine is the most efficient at avoiding severe deformity, with prolonged offloading and immobilization as the current mainstay of treatment. However, with recent advancements in medical and surgical modalities, this may become the treatment of the past as clinicians begin to favor medical management and early surgical intervention.

Plantar Approach for Midfoot Wedge Resection to Reconstruct the Rocker Bottom Foot

Chronic deformity of the foot can lead to ulceration, infection, and amputation. Midfoot wedge osteotomy for deformity correction has been described in the literature; however, most reports are case review or small series. Wedge osteotomy can be performed from a medial or plantar approach, but there are limited data on outcomes regarding these relatively uncommon procedures. This study aims to review a population of patients with a rocker bottom foot deformity that underwent a midfoot wedge resection performed from the plantar surface for deformity correction, wound healing, and limb salvage. A review of medical records from a single foot and ankle surgeon was undertaken. Patients who had a midfoot wedge performed from the plantar surface to address rocker bottom deformity resulting from Charcot neuroarthropathy or severe flatfoot were included. Thirty patients met inclusion criteria. The outcome measures evaluated were minor and major complications, wound healing, and functional limb status. Statistical analysis was performed to evaluate factors that influenced outcomes. At time of final follow up, 17 of 20 (85%) preoperative wounds had healed. Mean preoperative talo-first metatarsal angle was -25° and improved to -5° postoperatively. An 87% limb salvage rate (26/30) was demonstrated. Body mass index was the only statistically significant factor that influenced functional limb status. Maintaining a functional limb can have profound effects on a patient's quality of life. Generally, patients with this severe rocker bottom foot deformity have multiple comorbidities and are at an increased risk of major amputation and early death. The current study has shown that patients with a rocker bottom foot deformity can benefit from midfoot wedge resection from a plantar approach to achieve a plantigrade foot.

Influence of Patient Setting and Dedicated Limb Salvage Efforts on Outcomes in Charcot-Related Foot Ulcer

Charcot neuroarthropathy is a devastating consequence of diabetes mellitus and peripheral neuropathy. Because of its rarity, the condition is often misdiagnosed or poorly managed. When misadventure occurs, patients with Charcot neuroarthropathy can suffer ulceration, infection, amputation, and death. When patients have Charcot-related foot ulcers, the risks are amplified. Utilizing advanced electronic medical record analysis, a 30-month investigation was undertaken to determine if patients with diabetes mellitus and a concomitant diagnosis of Charcot-related foot ulcer were at greater risk of complications because of location setting of initial treatment for their condition. Charcot foot-related ulcers that are diagnosed in the outpatient setting had established foot specialist care. The outpatient management of the condition lead to a significant reduction in the amount of admissions to a higher acuity setting. However, patient outcomes did not vary once established and dedicated limb salvage efforts were employed. In this large contemporary population managed in a tertiary health system, patients with Charcot-related foot ulcer had negative outcomes when they were initially treated in an inpatient setting and had a significantly greater likelihood of readmission as compared with individuals who had established focused limb salvage care.

Charcot arthropathy of the diabetic foot in a sub-Saharan tertiary hospital: a cross-sectional study

Background

Charcot foot arthropathy is a potentially limb-threatening condition that leads to progressive destruction of the bones and joints in the neuropathic foot. One of its main causes is diabetes mellitus whose prevalence is steadily increasing. The acute phase is often misdiagnosed thus leading to foot deformity, ulceration and increased risk of amputation. There is a paucity of literature on this condition from sub-Saharan Africa. This study aimed at determining the extent of Charcot foot arthropathy, the radiological patterns of Charcot foot arthropathy and patient’s factors associated with Charcot foot arthropathy among adult patients with longstanding diabetes in an African setting.

Methods

This was a cross-sectional study that was carried at a national referral and university teaching hospital in Kampala, Uganda. One hundred patients with longstanding diabetes mellitus were consecutively recruited. Patients with a history of having diabetes mellitus for at least seven years since diagnosis were considered to have a longstanding disease. Clinical assessment of both feet was done. Weight-bearing radiographs of the selected foot were taken and evaluated using the Sanders and Frykberg and modified Eichenholtz classifications. A blood sample was taken for glycosylated haemoglobin (HbA1c). Data were summarized using descriptive statistics and student t-test.

Results

The proportion of Charcot foot arthropathy among patients with longstanding diabetes was 12% of which one-third (4 out of 12) were acute cases. Fifty percent of the lesions were in the forefoot and 50% in the midfoot. Seventeen percent of lesions were at the inflammatory stage of the modified Eichenholtz classification, 50% at the developmental stage, 25% at the healing stage, and 8% at the remodelling stage. An abnormal foot radiograph was significantly associated with Charcot foot arthropathy among patients with longstanding diabetes.

Conclusion

Charcot foot arthropathy is fairly common in patients with longstanding diabetes mellitus in these settings with one third of patients presenting in the early acute phase. An abnormal weight-bearing radiograph was an associated factor of Charcot foot arthropathy among this specific group of patients. To reduce on the morbidity and limb threatening sequelae of this condition, clinicians are therefore advised to routinely examine the feet of patients with diabetes and send those with suspicious signs and symptoms for radiographic assessment.

Pressure distribution under the contralateral limb in Charcot arthropathy with different walking speeds

BACKGROUND

The total contact cast has been recognized as the "gold standard" for treatment of Charcot neuro-osteoarthropathy (CN). However, removable cast walkers (RCWs) became an alternative option especially after resolution of the acute stage. RCWs with an elevated sole construction often induce leg length discrepancy (LLD) that could significantly affects plantar pressure (PP) distribution in diabetic patients with neuropathy.

AIM

To study the additional effect of walking speed on PP abnormalities induced by LLD.

METHOD

The study included 16 patients with diabetes (59±8.8years; 8 men and 8 women), with unilateral CN offloaded by RCW. In-shoe PP distribution was measured using F-scan (Tekscan Inc.), whilst patients walked at their normal speed (53±4 steps/min), versus short slow steps (24±3/min) under the two walking conditions: (1) neglected LLD, and (2) corrected LLD.

RESULTS

The greatest reduction in PP was seen during reduction of walking speed, with corrected LLD, followed by corrected LLD with normal walking speed, followed by neglected LLD with slowing of walking speed. The highest PP was found when the patient remain on their normal walking speed and LLD was neglected.

CONCLUSION

The contralateral foot of CN offloaded with RCW, is subjected to high pressure loads beneath the hallux, 1st, 2nd, 3rd, and 5th metatarsal heads. As such, care should be taken not only to avoid minor LLD, but to also advise the patient to practice short slow steps while walking, so that pressure overload on contralateral limb and its possible contribution to the development of bilateral Charcot, could be minimized.

Development of Charcot Neuroarthropathy in Diabetic Patients who Received Kidney or Kidney-Pancreas Transplants

Only a small percentage of the general diabetic population develops Charcot neuroarthropathy. Charcot arthropathy greatly increases the risk of foot complications. At our academic institution, there appeared to be an increased incidence of Charcot arthropathy in transplant patients. We hypothesized that Charcot neuroarthropathy incidence is higher in the diabetic patients who had received kidney or kidney-pancreas transplants. The charts of 1000 patients were reviewed from January 2000 to January 2011. Four hundred and eighty-seven patients were included in the study. Of these diabetic patients, 249 had received a kidney transplant and 238 a kidney-pancreas transplant. The data were analyzed for the incidence of Charcot in each group. Other risk factors and sequelae were also evaluated and analyzed. The incidence of Charcot development in the diabetic patients who had a kidney-pancreas transplant was 18.4%, 44 of 238 patients. This was significantly higher than the incidence in kidney transplant patients, which was 11.2%, 28 of 249 patients (p < .05). Peripheral arterial disease was a statistically significant independent risk factor for developing ulceration, osteomyelitis, and subsequent amputation. Type 1 diabetic patients developed Charcot at a higher rate that was also statistically significant compared with type 2 diabetic patients. In our study, diabetic patients who had undergone kidney-pancreas transplants were associated with higher risk for development of Charcot neuroarthropathy than kidney transplants alone. The incidence of Charcot development in both these transplant groups was also much higher than in the general diabetic population. This is of particular interest to clinicians and surgeons as both transplant groups were found to be high risk for subsequent foot ulceration, infection, and amputation.

Long Term Follow Up of a Vascularized Osteocutaneous Free Flap for Reconstruction in Charcot Neuroarthropathy: A Case Report

Vascularized osteocutaneous free flaps have seen increasing use in foot and ankle surgery for the repair of bony defects secondary to chronic nonunion, osteomyelitis, and fractures. One example is the Medial Femoral Condyle (MFC) Flap. The utility of the MFC flap for the repair of a bony defect in a diabetic patient, however, has yet to be explored. We report the long-term results of a case describing the use of an MFC flap to reconstruct an osseous defect resulting from first metatarsophalangeal joint resection in a diabetic patient.

Correction of ankle and hind foot deformity in Charcot neuroarthropathy using a retrograde hind foot nail-The Kings' Experience

BACKGROUND

Corrective fusion for the unstable deformed hind foot and mid foot in Charcot Neuroarthropathy (CN) is quite challenging and is best done in tertiary centres under the supervision of multidisciplinary teams.

METHODS

We present a follow up to our initial report with a series of 42 hind foot corrections in 40 patients from a tertiary level teaching hospital in the United Kingdom. The mean patient age was 59 (33-82). 17 patients had type1diabetes mellitus, 23 had type 2. 23 feet in 22 patients had chronic ulceration despite offloading. 17 patients were ASA 2 and 23 were ASA grade 3. All patients had hind foot nail fusion performed through a standard technique by the senior author and managed perioperatively by the multidisciplinary team.

RESULTS

At a mean follow up of 42 months (12-99) we achieved 100% limb salvage initially and a 97% fusion rate. One patient with persisting non-union of ankle and subtalar joint with difficulty in bracing has been offered below-knee amputation. We achieved deformity correction in 100% and ulcer healing in 83%. 83% patients are able to mobilize and manage independent activities of daily living. There were 11 patients with one or more complications including metal work failure, infection and ulcer reactivation. There have been nine repeat procedures including one revision fixation and one vascular procedure.

CONCLUSION

Single stage corrective fusion for hind foot deformity in CN is an effective procedure when delivered by a skilled multidisciplinary team.

Surgical treatment for chronic Charcot neuroarthropathy

Charcot Neuro-arthropathy (CN) is a condition characterized by a progressive derangement of the joints, in individuals affected with sensitive and autonomic neuropathy. The pathogenesis of CN is multifactorial as neuropathy is a necessary, but insufficient condition for the onset of the disease. The most important indication for surgical treatment of Charcot foot is a severe deformity that compromises the functionality of the limb, causing a high risk for ulceration, infection and amputation. The goal in Charcot foot treatment is to obtain and maintain the correction of a severe deformity and/or prevent its development. There are many surgical approach to the CN, such as exostectomy, arthrodesis with internal or external fixation and amputation. Every method has a different indication and specific complication. The right surgical approach in the CN is a real challenge for orthopedic surgeon that need a complete knowing of technique, material and complication.

A Systematic Review of Current Surgical Interventions for Charcot Neuroarthropathy of the Midfoot

Charcot neuroarthropathy of the foot, or Charcot foot, is a pathologic entity of the foot, associated with diabetes mellitus. Owing to the increase of diabetes mellitus in developed nations worldwide, the prevalence of Charcot foot has been increasing. The initial treatment of Charcot foot is often conservative, with methods including bracing, casting, and the use of customized orthopedic shoes. However, many cases of Charcot foot eventually require surgery, because the consequent destabilization of the foot associated with bone, joint, and nerve injury due to the pathology eventually leave patients unable to walk independently. The present systematic review analyzed the published data regarding surgical interventions for midfoot Charcot deformities and estimated the rates of common complications occurring with the surgical modalities studied. The main outcomes of interest analyzed in the present study were postoperative amputation and bony fusion. The included cohort of patients with Charcot foot was very heterogeneous in terms of the demographic and comorbid characteristics. However, even with this heterogeneity, the present study should provide useful information to surgeons in terms of the outcomes after some of the common surgical procedures for midfoot Charcot.

New trends in the orthopaedic management of diabetic foot

Although there are various types of therapeutic footwear currently used to treat diabetic foot ulcers (DFUs), recent literature has enforced the concept that total-contact casts are the benchmark.Besides conventional clinical tests and imaging modalities, advanced MRI techniques and high-sensitivity nuclear medicine modalities present several advantages for the investigation of diabetic foot problems.The currently accepted principles of DFU care are rigorous debridement followed by modern wound dressings to provide a moist wound environment. Recently, hyperbaric oxygen and negative pressure wound therapy have aroused increasing attention as an adjunctive treatment for patients with DFUs.For DFU, various surgical treatments are currently available, including resection arthroplasty, metatarsal osteotomies and metatarsal head resections.In the modern management of the Charcot foot, surgery in the acute phase remains controversial and under investigation. While conventional fixation techniques are frequently insufficient to keep alignment postoperatively, superconstruct techniques could provide a successful fixation.Retrograde intramedullary nailing has been a generally accepted method of achieving stability. The midfoot fusion bolt is a current treatment device that maintains the longitudinal columns of the foot. Also, Achilles tendon lengthening remains a popular method in the management of Charcot foot. Cite this article: EFORT Open Rev 2018;3 DOI: 10.1302/2058-5241.3.170073.

Relationship of Cuboid Height to Plantar Ulceration and Other Radiographic Parameters in Midfoot Charcot Neuroarthropathy

The objective of the present investigation was to examine the effect of cuboid height on the presence of plantar midfoot ulceration and the relationship of cuboid height to other commonly performed radiographic parameters during evaluation of midfoot Charcot neuroarthropathy. A retrospective analysis was performed of 68 feet in 60 subjects who met the inclusion criteria. We did not observe statistically significant differences in the presence of a plantar midfoot ulceration when considering a cuboid height threshold of 0.0 mm, 2.0 mm, -2.0 mm, or -5.0 mm nor was the cuboid height a robust predictor for the presence of plantar midfoot ulceration when considering the positive predictive value, negative predictive value, sensitivity, or specificity. We observed a significant negative association between a negative cuboid height and the presence of Sanders Type 2 deformities (76.2% of those with negative height versus 50.0% of those with positive height had type 2 deformities; p = .0036), the absence of radiographic visualization of the lateral tarsometatarsal joint (71.4% of those with negative height versus 26.9% of those with positive height had an absence of radiographic visualization; p = .005), and lower calcaneal inclination angles (6.06° versus 15.08°; p < .001). We further observed significant positive correlations between the cuboid height and the calcaneal-fifth metatarsal angle (0.655; p < .000), calcaneal inclination angle (0.591; p < .001), calcaneal-cuboid angle (0.254; p = .038), medial column height (0.264; p = .029), and first metatarsal inclination angle (0.245; p = .047). We also observed negative correlations with Meary's angle (-0.475; p < .001) and the talar declination angle (-0.387; p < .001). These findings showed a general trend toward a decreasing cuboid height and increasing sagittal plane deformity involving both the medial and the lateral columns. The results of the present investigation provide evidence against a single radiographic parameter being associated with the presence of plantar midfoot ulceration.

Salient features and outcomes of Charcot foot - An often-overlooked diabetic complication: A 17-year-experience at a diabetic center in Bangkok

BACKGROUND

Charcot foot is a rare but a serious diabetic condition. Recognition of this often overlooked condition to provide timely and proper management is important for a better prognosis. Limited data on Charcot foot was available in Asians.

AIMS

The aim of this study is to describe salient features and outcomes of Charcot foot in Thai patients.

METHOD

We presented our experience of 40 cases of Charcot foot patients who were treated from 2000 to 2016 at Theptarin Hospital, Bangkok, Thailand.

RESULTS

A total of 40 Charcot foot patients were identified (13 acute, 27 chronic; mean age 58.7 ± 10.2 years; duration of diabetes 18.0 ± 8.8 years; T2DM 95%). The average serum HbA1c level was 9.2 ± 1.9%. While acute Charcot foot was frequently misdiagnosed as cellulitis in almost one-third of patients, osteomyelitis was a leading cause of misdiagnosis in 15% of chronic Charcot foot patients. Ulcer-free rate at 6 and 12 months were observed in 60% and 58% of patients, respectively. The mortality rate was 13% during a median follow-up period of 57 months. Only 61% of the patients resumed walking normally while almost one-fourth of them were wheelchair-bound.

CONCLUSIONS

Charcot foot in Thai patients mainly developed in long-standing poorly controlled type 2 diabetes with neuropathy, and presented late in the course of the disease. It was often misdiagnosed resulting in improper management and poor outcome which included amputation.

New Fixation Methods for the Treatment of the Diabetic Foot: Beaming, External Fixation, and Beyond

Surgical correction of complex foot and ankle deformities secondary to Charcot neuroarthropathy remains a significant surgical challenge. New technological advancements in hardware have allowed for the use of augmented fixation techniques in midfoot deformity correction, including the use of indication-specific locking plates and beaming techniques that offer enhanced stability. Severe hindfoot deformity management can employ the use of internal fixation, including intramedullary hindfoot nails and circular external fixation frames for limb salvage.

Treatment of Charcot Neuroarthropathy and osteomyelitis of the same foot: a retrospective cohort study

BACKGROUND

We evaluated treatment of osteomyelitis in the foot in the presence of Charcot neuroarthropathy, a devastating condition with progressive degeneration and joint destruction. We hypothesized that there was a difference in (1) amputation rate, (2) amputation level, (3) duration of antibiotic therapy, and (4) duration of immobilization for treatment of osteomyelitis within versus outside the Charcot zone.

METHODS

Forty patients (43 ft) diagnosed with Charcot neuroarthropathy and osteomyelitis of the same foot were retrospectively analyzed. Some patients were successfully treated for osteomyelitis at different sites on the same foot at different times, thus 60 cases of osteomyelitis were identified in 40 treated patients. Cases were divided according to osteomyelitis localization: Group 1 had osteomyelitis outside the active Charcot region; Group 2 had osteomyelitis within the active Charcot region.

RESULTS

Male patients (n = 29; mean age 58.2, range 40.1 to 77.5 years) were younger than female patients (n = 11; mean age 70.4, range 51.4 to 87.5, p = 0.02 years). Amputation rate was 52% overall (26/40 patients; 26/43 ft): 63% of 30 Group 1 cases and 40% of 30 Group 2 cases (p = 0.09). Amputation level (p = 0.009), duration of antibiotic treatment (p = 0.045) and duration of immobilization (p = 0.01) differed significantly between the groups.

CONCLUSIONS

Osteomyelitis within the Charcot region is associated with a higher level of amputation and longer durations of antibiotic therapy and immobilization. Osteomyelitis outside and within the Charcot affected region should be considered separately. If osteomyelitis occurs outside the active Charcot region, primary amputation may be preferred to internal resection.

LEVEL OF EVIDENCE

Retrospective cohort chart review study.

Pathogenesis and potential relative risk factors of diabetic neuropathic osteoarthropathy

Diabetic neuropathic osteoarthropathy (DNOAP) is an uncommon, but with considerable morbidity and mortality rates, complication of diabetes. The real pathogenesis is still unclear. The two popular theories are the neuro-vascular theory and neuro-traumatic theory. Most theories and pathways focused on the uncontrolled inflammations that resulted in the final common pathway, receptor activator of nuclear factor κβ ligand (RANKL)/osteoprotegerin (OPG) axis, for the decreased bone density in DNOAP with an osteoclast and osteoblast imbalance. However, the RANKL/OPG pathway does not explain all the changes, other pathways and factors also play roles. A lot of DNOAP potential relative risk factors were evaluated and reported in the literature, including age, gender, weight, duration and type of diabetes, bone mineral density, peripheral neuropathy and arterial disease, trauma history, and some others. However, most of them are still in debates. Future studies focus on the pathogenesis of DNOAP are still needed, especially for the genetic factors. And, the relationship between DNOAP and those potential relative risk factors are still need to further clarify.

Improved Quality of Life After Transtibial Amputation in Patients With Diabetes-Related Foot Complications

The purpose of this study was to evaluate health-related quality of life after major lower-extremity amputation in a cohort of patients with diabetes mellitus. We evaluated 81 patients with diabetes and transtibial amputation (TTA) who had a minimum of 1 year of follow-up. Of these 81 patients, 50.6% completed the Short Form Survey (SF-36) and the Foot and Ankle Ability Measure (FAAM) preoperatively and postoperatively. Outcome measures before and after TTA were compared using Welch’s ANOVA for continuous variables and Fisher’s exact test for categorical variables. There was significant improvement in all 8 subscales of the SF-36, physical component summary (PCS) score, mental component summary (MCS) score, and the FAAM. The median SF-36 PCS score improved from 26.2 to 36.6 preoperatively versus postoperatively ( P < .0005). The postoperative PCS score improved in 75.6% of patients and worsened in 24.4%. The median SF-36 MCS score improved from 43.7 to 56.1 preoperatively versus postoperatively ( P < .0005). Both the FAAM activities of daily living (ADL; P < .005) and FAAM sports scores ( P < .05) improved significantly. The postoperative FAAM general/ADL score improved in 75.6% of patients and worsened in 24.4%. Patients who were nonambulatory postoperatively had significantly lower SF-36 general health subscale scores and lower FAAM scores than patients who were ambulatory postoperatively. In select patients with nonfunctional lower extremities resulting from instability and/or chronic infection, TTA can result in significant improvement in quality of life and lower-extremity function. We acknowledge that 25% of patients had a reduction in self-reported quality of life; however, 75% of patients improved their quality of life.

Complex ankle arthrodesis with step-cut osteotomy in Charcot arthropathy with bone loss

We report a case of a complex limb salvage ankle arthrodesis in a patient with Charcot arthropathy. A step-cut osteotomy was performed in order to tackle the issues of anterior tibial bone loss; worsening leg length discrepancy; soft tissue contraction; joint instability and high risk of non-union. The construct formed by the step-cut allowed for the preservation of good bone stock; avoidance of further limb shortening; increased torsional stability and increased surface area for bony union. This resulted in a patient with a stable, plantigrade foot appropriate for footwear. We use this case to highlight this technique as an option in the operative management of complex ankle fusions with sagittal or coronal plane deformity with bone loss and subluxation of the ankle joint.

Neuropathic Knee Joint - A Complication of Syrinx Following Spinal Anesthesia: A Rare Case Report and Review of Literature

INTRODUCTION

Neurological complications due to spinal anesthesia are dysesthesia, paresthesia, cauda equina syndrome, and neuropathic joint. However, neurological complications are rare. We report a case of neuropathic joint of knee as a complication of syrinx following postspinal anesthesia.

CASE REPORT

A 33-year-old female came with complaints of pain and instability of her left knee and left foot drop. She had developed weakness of her left lower limb following her cesarean section surgery done under spinal anesthesia. Clinically and radiologically, she had features of the neuropathic left knee joint which had occurred as a complication of syrinx following spinal anesthesia.

CONCLUSION

The case is reported for its rarity and to highlight the possible neurological complications of spinal anesthesia.

Comparison of Diabetic Charcot Patients With and Without Foot Wounds

BACKGROUND

The primary aim of this study was to evaluate the outcomes of a series of patients with Charcot neuroarthropathy (CN) who were evaluated in a tertiary care setting. We hypothesized that those patients with CN who presented with a Charcot-related foot wound would have lower rates of successful limb salvage than patients who presented without a wound.

METHODS

Two hundred forty-five patients (280 feet) were identified with diabetic CN during the time period from January 1, 2005, to June 1, 2015. This consecutive cohort of patients was treated by a single surgeon and had a mean age of 57.9 ± 10.0 years. Our CN patients were divided into 2 groups for the purpose of our analysis. Our study group included those patients who presented to our clinic with a Charcot-related foot wound. Our control group was composed of CN patients who presented without a Charcot-related foot wound.

RESULTS

Overall, 78 feet (27.9%) were successfully treated nonoperatively and 202 feet (72.1%) required some type of surgery. Of the 202 feet that received surgery, 22 (10.9%) were not felt to be suitable for reconstruction and underwent a definitive transtibial amputation without an attempt at reconstruction. An additional 18 patients underwent soft tissue surgery, which included drainage of infection, posterior muscle group lengthening, or soft tissue reconstructive flap surgery. The remaining 162 feet underwent osseous surgery, which included ostectomies for osteomyelitis, exostectomies, osteotomies, and arthrodesis. Eighteen of the 180 limbs (10.0%) that underwent soft tissue or osseous reconstruction ultimately required a transtibial amputation, resulting in a successful limb salvage rate of 90.0%. Thirty-five amputations were performed in 164 feet (21.3%) with Charcot-related foot wounds compared with 5 amputations in 116 feet (4.5%) without Charcot-related foot wounds (OR 6.02, 95% CI 2.28-15.91, P < .0001).

CONCLUSION

The presence of a Charcot-related foot wound at presentation increased the likelihood of a major lower extremity amputation by a factor of 6. Other risk factors that were associated with major amputation in patients included active infection at presentation, nonunion/instability after reconstruction, and a postoperative wound problem. The overall rate of successful limb salvage in patients deemed reconstructive candidates was 90%.

LEVEL OF CLINICAL EVIDENCE

Level III, retrospective, case-control study.

The Effect of Charcot Neuroarthropathy on Limb Preservation in Diabetic Patients with Foot Wound and Critical Limb Ischemia after Balloon Angioplasty

OBJECTIVE

The aim of this article is to investigate one-year limb preservation rates after below-the-knee angioplasty in patients with diabetic foot wound who only have critical limb ischemia (CLI) and those who have Charchot neuroarthropathy (CN) accompanied by CLI.

METHODS

This single-center, retrospective study consists of 63 patients with diabetic foot wound who had undergone lower extremity balloon angioplasty of at least 1 below-the-knee (BTK) vessel. Only those patients with postprocedural technical success of 100% were selected from the database. All patients were classified into two groups as patients with CLI and CN and patients with CLI only without CN. The Kaplan-Meier method was used to compare the limb preservation rates for the two groups.

RESULTS

There was no statistically significant difference between patient age, gender, diabetic disease duration, and comorbid disease such as chronic renal insufficiency, hypertension, and coronary artery disease of the two groups (p > 0.05). Limb preservation in the 12 months was 59.1% in the CN group and 92.7% in the group without CN. Also, limb preservation rates between the two groups displayed statistically significant differences (p < 0.005).

CONCLUSION

This study showed that CLI can accompany CN in patients with diabetes. Limb preservation rates with endovascular treatment in diabetic patients with CLI only are better than in diabetic patients with CLI and CN.

Outcome after protected full weightbearing treatment in an orthopedic device in diabetic neuropathic arthropathy (Charcot arthropathy): a comparison of unilaterally and bilaterally affected patients

Background

Charcot neuropathic arthropathy (CN) is a chronic, progressive, destructive, non-infectious process that most frequently affects the bone architecture of the foot in patients with sensory neuropathy. We evaluated the outcome of protected weightbearing treatment of CN in unilaterally and bilaterally affected patients and secondarily compared outcomes in protected versus unprotected weightbearing treatment.

Methods

Patient records and radiographs from 2002 to 2012 were retrospectively analyzed. Patients with Type 1 or Type 2 diabetes with peripheral neuropathy were included. Exclusion criteria included immunosuppressive or osteoactive medication and the presence of bone tumors. Ninety patients (101 ft), mean age 60.7 ± 10.6 years at first diagnosis of CN, were identified. Protected weightbearing treatment was achieved by total contact cast or custom-made orthosis. Ulcer, infection, CN recurrence, and amputation rates were recorded. Mean follow-up was 48 (range 1–208) months.

Results

Per the Eichenholtz classification, 9 ft were prodromal, 61 in stage 1 (development), 21 in stage 2 (coalescence) and 10 in stage 3 (reconstruction). Duration of protected weightbearing was 20 ± 21 weeks and 22 ± 29 weeks in patients with unilateral and bilateral CN, respectively. In bilaterally affected patients, new ulcers developed in 9/22 (41%) feet. In unilaterally affected patients, new ulcers developed in 5/66 (8%) protected weightbearing feet and 4/13 (31%) unprotected, full weightbearing feet (p = 0.036). The ulceration rate was significantly higher in bilaterally versus unilaterally affected patients with a protected weightbearing regimen (p = 0.004). Soft tissue infection occurred in 1/13 (8%) unprotected weightbearing feet and 1/66 (2%) protected weightbearing feet in unilaterally affected patients, and in 1/22 (4%) protected weightbearing feet of bilaterally affected patients. Recurrence and amputation rates were similar across treatment modalities.

Conclusions

Bilateral CN results in significantly more ulcers than unilateral CN and leads to slightly higher soft tissue infections. Protected weightbearing in an orthopedic device can reduce the risk for complications in acute CN of the foot and ankle.

A Curious Distal Tibiofibular Neuropathic Fracture: A Case Report

Hindfoot and distal leg neuropathic fracture collapse secondary to normal pressure hydrocephalus is a very rare clinical pathology. The authors present a case of a 69-year-old woman who sustained a distal tibiofibular fracture that resulted in a recurvatum deformity with idiopathic neuropathy and gait instability on initial presentation. A subtalar and ankle joint arthrodesis was performed achieving rectus alignment of the lower extremity with no postoperative complications. Her neuropathic etiology was negative for common causative factors, including diabetes, infection, nutritional deficiencies, congenital neuropathy, and trauma. Approximately 6 months postoperatively, the patient had persistent bilateral lower extremity weakness with the sensation of her "feet sticking to the floor" on ambulation. A referral to neurology revealed a normal pressure hydrocephalus as a possible etiology for her gait abnormalities and neuropathy. She required a ventriculoperitoneal shunt, with resolved gait disturbance and associated weakness approximately 1.5 years postoperatively.

LEVELS OF EVIDENCE

Therapeutic, Level IV: Case report.

Arthropathy-related pain in a patient with congenital impairment of pain sensation due to hereditary sensory and autonomic neuropathy type II with a rare mutation in the WNK1/HSN2 gene: a case report

Background

Hereditary sensory and autonomic neuropathy (HSAN) type II with WNK1/HSN2 gene mutation is a rare disease characterized by early-onset demyelination sensory loss and skin ulceration. To the best of our knowledge, no cases of an autonomic disorder have been reported clearly in a patient with WNK/HSN2 gene mutation and only one case of a Japanese patient with the WNK/HSN2 gene mutation of HSAN type II was previously reported.

Case presentation

Here we describe a 54-year-old woman who had an early childhood onset of insensitivity to pain; superficial, vibration, and proprioception sensation disturbances; and several symptoms of autonomic failure (e.g., orthostatic hypotension, fluctuation in body temperature, and lack of urge to defecate). Genetic analyses revealed compound homozygous mutations in the WNK1/HSN2 gene (c.3237_3238insT; p.Asp1080fsX1). The patient demonstrated sensory loss in the “stocking and glove distribution” but could perceive visceral pain, such as menstrual or gastroenteritis pain. She experienced frequent fainting episodes. She had undergone exenteration of the left metatarsal because of metatarsal osteomyelitis at 18 years. Sural nerve biopsy revealed a severe loss of myelinated and unmyelinated nerves. She complained of severe pain in multiple joints, even on having pain impairment. Although non-steroidal anti-inflammatory drugs are generally more effective than acetaminophen for arthritis, in our case, they were ineffective and acetaminophen (2400 mg/day) adequately controlled her pain and improved quality of life. Over 3 months, the numerical rating scale, pain interference scale of the Brief Pain Inventory, and the Pain Catastrophizing Scale decreased from 6/10 to 3/10, from 52/70 to 20/70, and from 22/52 to 3/52 points, respectively.

Conclusions

This is the second reported case of a Japanese patient with WNK/HSN2 gene mutation of HSAN type II and the first reported case of an autonomic disorder in a patient with the WNK/HSN2 gene mutation. Acetaminophen adequately controlled arthropathy related pain in a patient with congenital impairment of pain sensation.

Correlation of Systemic Inflammatory Markers With Radiographic Stages of Charcot Osteoarthropathy

BACKGROUND

Charcot osteoarthropathy (COA) is characterized by a progressive destruction of bone and joint associated with neuropathy and is most common in the foot and ankle. Clinical manifestation of COA is frequently indistinguishable from other causes of pain, swelling, and erythema of the affected extremity, in particular, infection. Diagnosis of COA can be challenging in particular in early stages where radiographic changes are sparse. The presence of elevated systemic inflammatory parameters in the context of suspected infection may delay early diagnosis and treatment of COA. The aim of this retrospective analysis was to assess whether elevated systemic inflammatory parameters may be present, in particular in early stages of COA and thus not be used as an exclusion criterion for the diagnosis of COA.

METHODS

Forty-two patients (mean age 48.2 ± 9.4 years, 36 male, 6 female) with a diagnosis of unilateral COA were the subject of this retrospective study. The diagnosis of COA was confirmed by plain radiographs, magnetic resonance imaging and clinical course. Systemic inflammatory parameters were recorded at the time of referral. Acute stages (stages 0 and 1) were treated with a total contact cast (TCC) and protected weight bearing for a minimum of 6 weeks. For chronic stages (stages 2 and 3) custom-made shoes were prescribed. The feet were stratified into "acute" (Eichenholz stages 0 and 1) and "subacute/chronic" (Eichenholz stages 2 and 3) groups.

RESULTS

Statistically significant differences were observed for all recorded systemic inflammatory parameters (C-reactive protein level, WBC count, erythrocyte sedimentation rate) between the acute and subacute/chronic groups. No statistical difference was observed considering the anatomic pattern of involvement.

CONCLUSION

The present study demonstrated that elevated systemic inflammatory parameters may be present in COA and can further be used to distinguish between acute and subacute stages of COA, based on the Eichenholtz classification. Thus, we suggest that elevated inflammatory markers should not be considered an exclusion criterion for the diagnosis of COA.

LEVEL OF EVIDENCE

Level III, retrospective comparative series.

Neuropathic osteoarthropathy with and without superimposed osteomyelitis in patients with a diabetic foot

Soft tissue and bone infection involving the foot is one of the most common long-term complications of diabetes mellitus, implying a serious impairment in quality of life for patients in the advanced stages of the disease. Neuropathic osteoarthropathy often coexists and differentiating between these two entities is commonly challenging, but crucial, as the management may differ substantially. The importance of correct diagnosis cannot be understated and effective management requires a multidisciplinary approach owing to the complicated nature of therapy in such patients. A missed diagnosis has a high likelihood of major morbidity for the patient, including limb amputation, and over-diagnosis results in a great socioeconomic challenge for healthcare systems, the over-utilization of healthcare resources, and the unwise use of antibiotics. Diagnosis is largely based on clinical signs supplemented by various imaging modalities such as radiography, MR imaging, and hybrid imaging techniques such as F-18 fluorodeoxyglucose-positron emission tomography. In the interests of the management of diabetic foot complications, this review article is aimed on the one hand at providing radiologists with important clinical knowledge, and on the other hand to equip clinicians with relevant radiological semiotics.

Extension and grading of osteomyelitis are not related to limb salvage in Charcot neuropathic osteoarthropathy: A cohort prospective study

AIMS

Charcot neuropathic osteoarthropathy (CN) represents a complication for diabetic patients which involves a progressive alteration of the osteoarticular apparatus with high risk of amputation. The aim of the study was to assess whether the localization of CN and the extent or grading of the osteomyelitis have an influence on the rate of limb salvage and the time to recovery.

METHODS

We treated a diabetic population affected by CN complicated by ulceration and widespread osteomyelitic involvement. All patients were treated surgically to eliminate infected tissues, stabilize and correct the bone deformities. Histopathological and microbiological analyses were carried out on the bone specimens.

RESULTS

Thirty-three patients affected by CN complicated by large osteomyelitic involvement of midfoot and/or ankle were treated between January 2010 and May 2014. The mean follow-up was 409,35 ± 154,06 days. Thirty patients had complete recovery (90.91%) at the end of follow-up. No difference in limb salvage rate and time to recovery was observed when stratifying the population according to CN localization, extent and grading of osteomyelitis.

CONCLUSIONS

In this cohort prospective study we observed a high percentage of limb salvage in patients affected by CN complicated by diffuse midfoot/hindfoot osteomyelitis. The localization of Charcot deformity and the extent/stage of osteomyelitis did not change the rate of limb salvage.

Charcot Neuroarthropathy in Patients With Diabetes: An Updated Systematic Review of Surgical Management

Charcot neuroarthropathy (CN) of the foot and ankle is a demanding clinical dilemma, and surgical management can be very complicated. Historically, the evidence guiding surgical management of CN has been small retrospective case series and expert opinions. The purpose of the present report was to provide a systematic review of studies published from 2009 to 2014 and to review the indications for surgery. A Medline search was performed, and a systematic review of studies discussing the surgical management of CN was undertaken. Thirty reports fit the inclusion criteria for our study, including 860 patients who had undergone a surgical procedure for the treatment of CN. The surgical procedures included amputation, arthrodesis, debridement of ulcers, drainage of infections, and exostectomy. The midfoot was addressed in 26.9% of cases, the hindfoot in 41.6%, and the ankle in 38.4%. Of the 30 studies, 24 were retrospective case series (level 4), 4 were controlled retrospective studies (level 3), and 2 were level II studies. The overall amputation rate was 8.9%. The quality of the published data on the surgical management of CN has improved during the past several years. Evidence concerning the timing of treatment and the use of different fixation methods remains inconclusive.

Charcot stage 0: A review and consideratons for making the correct diagnosis early

Charcot neuropathic osteoarthropathy (CN) is a rare disease (NIDDK, NIH Summary Report Charcot Workshop, 2008) that causes significant morbidity and mortality for affected patients. The disease can result in severe deformities of the foot and ankle that contribute to the development of ulcerations and amputations. Medical advances have failed to find ways to stop the progression of the disease. However, it is known that early detection of the CN has a substantial impact on patient outcomes. CN in the earliest stage is very difficult to recognize and differentiate from other similar presenting diseases. We intend to outline clinical considerations practitioners can use when evaluating a patient with early stage suspected CN.

Intramedullary fixation in severe Charcot osteo-neuroarthropathy with foot deformity results in adequate correction without loss of correction - Results from a multi-centre study

BACKGROUND

Charcot osteo-neuroarthropathy (CN) of the foot can induce severe instability and deformity. Results of a consecutive clinical multi-centre study with Midfoot Fusion Bolt (MFB, Synthes GmbH, Oberdorf, Switzerland) are reported.

METHODS

All patients (aged 18 years and older) treated between 2009 and 2013 with surgical reconstruction of the midfoot with MFB for CN were included. Demographics, pre-surgical health status, details of foot pathology, details of surgery, postoperative treatment, treatment failure, and adverse events were registered. The following radiographic angles were measured on pre-op, post-op and last follow-up radiographs: talo-1st metatarsal (TMT) angle dorsoplantar and lateral view, and calcaneo-5th metatarsal angle.

RESULTS

Forty-seven patients (48 feet) were included in three centres. In 38 patients (80.1%) diabetes was diagnosed. Wound healing problems occurred in 21% of patients and recurrent ulceration in 13%. Revision surgery for loss of correction was performed in three cases (6%). Union rate at final follow-up was 98%. Major amputation for deep infection was performed in two patients (4%), minor amputation at the foot level in three cases (6%). Failure was more frequent when only one MFB (instead of 2 or 3) was used and no Gastrocnemius lengthening was performed. Radiographic alignment significantly improved pre- versus postoperatively and preoperatively versus follow-up.

CONCLUSIONS

Realignment and fixation with MFB in severe CN result in adequate correction with minimal loss of correction in the observed clinical course. The non-union rate was lower than previously reported. Stable fixation with MFB is a valuable treatment option for CN with minimal loss of correction and high union rates. The use of a minimum of two bolts is recommended to avoid recurrent deformity. Clinical Trials.gov: NCT01770639.

Midtarsal Reconstructive Arthrodesis Using a Multi-Axial Correction Fixator in Charcot Midfoot Arthropathy

Reconstructive surgeries for Charcot foot are challenging due to complicated conditions and comorbidities including poor bone quality, sensory abnormalities, poor vascularity, and immunity impairment. Although various fixation devices, including screws, plates, and external fixators, have been used in the surgical reconstruction of the Charcot midfoot, all of these devices are associated with some disadvantages. This study aims to evaluate the outcome of the Multi-Axial Correction (MAC) monolateral external fixation system for the reconstructive surgery of midfoot Charcot neuroarthropathy. A total of 11 feet with midfoot Charcot arthropathy were treated surgically using the MAC fixation system solely or accompanied with minimal internal fixation. The mean postoperative follow-up was 29 (range = 12-44) months. The mean postoperative timing of the MAC system removal was 8.7 (range = 5-14) weeks. No pin tract infections were observed. All patients went on to successful union and correction of a rocker bottom deformity. No cases resulted in limb amputation. All patients were able to ambulate with custom diabetic shoes and insoles in 9 patients (10 feet) and commercially available shoes in 1 patient (1 foot). This study suggests that the MAC system can be an acceptable, easy option for the surgical treatment of midfoot Charcot arthropathy.

LEVEL OF EVIDENCE

Therapeutic, Level IV: Case series.

Midfoot Charcot Neuroarthropathy in Patients With Diabetes: The Impact of Foot Ulceration on Self-Reported Quality of Life

INTRODUCTION

Charcot neuroarthropathy (CN) and diabetic foot ulceration (DFU) are serious complications of diabetes mellitus (DM) that can result in infection, hospitalization, amputation, and have been shown to negatively affect quality of life (QOL). To the best of our knowledge, there are no studies in the literature that have specifically compared QOL in patients with diabetic CN without DFU to a group of patients with diabetic CN and concurrent DFU. The aim of this study was to compare self-reported assessments of QOL in patients with CN to a group of patients with CN and concomitant midfoot ulceration.

MATERIALS AND METHODS

We compared a group of 35 diabetic patients with midfoot CN and no ulcer to a group of 22 diabetic patients with midfoot CN and concurrent DFU. Self-reported outcome was assessed using the Medical Outcome Study Short Form 36 (SF-36) health survey and Foot and Ankle Ability Measure (FAAM).

RESULTS

No significant differences were found when comparing the 2 groups utilizing the SF-36 and FAAM with the exception that CN patients without foot ulcers had lower mean scores on the Bodily Pain Subscale. Both groups demonstrated negative impact on physical QOL and lower extremity function to a greater degree than mental QOL.

CONCLUSION

The presence of ulceration does not appear to significantly impact QOL in patients with CN when compared to patients with CN without ulceration.

LEVELS OF EVIDENCE

Prognostic, Level III: Case control.

Combined Internal and External Fixation for Diabetic Charcot Reconstruction: A Retrospective Case Series

Diabetic Charcot neuroarthropathy is a complex, limb-threatening disease process with major lifestyle-altering repercussions for patients. When Charcot neuroarthropathy leads to unstable deformity, ulceration, and potential infection despite conservative therapies, foot and ankle surgeons often consider reconstructive limb salvage procedures to restore function. The purpose of the present study was to evaluate the clinical and radiographic outcomes of diabetic Charcot reconstruction using combined internal and external fixation. A total of 22 patients were reviewed; 16 (72.73%) midfoot and 6 (27.27%) tibiotalocalcaneal arthrodesis procedures were consecutively performed from March 2009 to May 2013. All surgical procedures were performed in nonacute phases of the Charcot process in patients with diagnosed diabetes mellitus and documented peripheral neuropathy. Patients were excluded from the study if they were not diabetic despite having undergone Charcot reconstruction, regardless of the fixation method, or if they did not complete radiographic imaging. During a mean follow-up period of 58.60 ± 42.37 (range 16 to 164) weeks, limb salvage was achieved in 20 patients (90.91%), and 2 (9.09%) required below-the-knee amputation at a mean of 42 ± 14.14 weeks. Wound dehiscence occurred in 8 (36.36%), pin tract infection in 10 (45.45%), and superficial wound infection in 9 (40.91%) and peaked in bimodal fashion at 4 and 8 weeks postoperatively. Radiographic analysis of the pre- versus postoperative alignment showed statistically significant changes in the lateral talo-first metatarsal angle (p = .02) and lateral talar declination angle (p = .01). The limb salvage rates with diabetic Charcot reconstruction are improving in part because of the continued development of increasingly superior modalities for both internal and external fixation.

Charcot osteoarthropathy in type 2 diabetes persons presenting to specialist diabetes clinic at a tertiary care hospital

BACKGROUND

Charcot osteoarthropathy or charcot foot is a rare, chronic, non-communicable condition of bones and joints which may results into severe deformity and more prone to develop ulcers possibly leading to amputation. The purpose of this study was to determine the prevalence of Charcot osteoarthropathy and its association with age, BMI, gender, duration of diabetes, HBA1c and peripheral neuropathy.

METHODS

A total of 1931 subjects with type 2 diabetes having mean age 50.72 ± 10.66 years presenting in a specialist diabetes clinic at shalamar hospital, Lahore, Pakistan were enrolled. The diagnosis of Charcot osteoarthropathy was made by examination of both dorsal and plantar surfaces of foot for swelling, erythema, increase in temperature and any musculoskeletal deformity which was later confirmed by radiographs. Assessment of neuropathy was carried out by checking the sense of pressure, joint position and vibration. BMI (Body Mass Index), fasting blood glucose (FBG) and HbA1C were determined.

RESULTS

In all subjects including male 704 (36.45 %) and female 1227 (63.55 %), 0.4 % subjects had charcot deformity, while 0.2 %, 0.15 % and 0.05 % subjects having right, left and bilateral deformity respectively. Bilaterally symmetrical neuropathy was diagnosed in 25.4 % in subjects. There was a significant association (p < 0.05) of deformity with duration of diabetes, HbA1C and neuropathy, however no significant association (p > 0.05) was found with age, BMI, weight, height and gender.

CONCLUSION

There is a need to have a special care of persons with diabetes regarding blood glucose control and development of peripheral neuropathy. Early identification and management of risk factors may prevent the occurrence of charcot deformity. Patients must be educated about the foot care.

[Tibiotalocalcaneal corrective arthrodesis in Charcot arthropathy of the ankle with a retrograde nail]

BACKGROUND

Involvement of the ankle joint in Charcot osteoarthropathy is most often associated with severe instability and fracture or collapse of the talus. Caused by malalignment, ulcerations over both malleoli are associated with increased risk of major amputation.

OBJECTIVE

The goal of the operation is to realign the hind foot, gain a stable osteosynthesis, and prevent major amputation.

INDICATIONS

Charcot osteoarthropathy of the ankle joint with instability, with or without soft tissue involvement, failure of the primary arthrodesis of the ankle or subtalar joint.

CONTRAINDICATIONS

Acute osteitis/osteomyelitis, severe malalignment of the distal tibia, soft tissue infection close to the ankle joint.

SURGICAL TECHNIQUE

Realignment of the hind foot, preparation of the joint surfaces using a transfibular approach. Bone grafting of the defects, stable osteosynthesis with an anatomically shaped retrograde locking nail.

POSTOPERATIVE MANAGEMENT

Walker or cast for at least 12 weeks, 6 weeks no weight bearing. Partial weight bearing starting from week 7. X-ray control at 2, 6, and 12 weeks. After 12 weeks, walking in an ankle brace until fully consolidated.

Orthotic management of the neuropathic foot: an interdisciplinary care perspective

BACKGROUND

Clinical management of the patient with neuropathic foot is becoming commonplace in orthotic clinics worldwide. The presentations that can result from neuropathic foot are diverse, requiring clinicians to understand the pathomechanics of ulceration, infection, and Charcot joint arthropathy to provide effective interventions.

OBJECTIVES

The purpose of this clinical perspective is to provide a review of the literature regarding clinical concepts associated with orthotic management of neuropathic foot.

STUDY DESIGN

Literature review and clinical case study.

METHODS

Relevant literature were reviewed and summarized, and a clinical case study synthesizing reviewed concepts was presented.

RESULTS

Given the multifactorial nature of the neuropathic foot, treatments must be multifaceted and patient-specific to effectively address the underlying disease processes. While systemic issues such as peripheral arterial disease are treated by physicians, local issues such as foot deformity are managed by orthotists. Orthotic interventions commonly include custom footwear to reduce the risk of ulceration through creation of a protective environment or targeted plantar offloading. Patient and caregiver education to encourage management compliance is equally as important to ensure successful treatment.

CONCLUSION

Patients with neuropathic foot benefit from an interdisciplinary care approach which engages physicians, wound care practitioners, and orthotists to treat and manage systemic and local problems. Addressing this pathology through interdisciplinary care may positively affect the patient's health status while lowering associated healthcare costs through improved treatment efficacy.

CLINICAL RELEVANCE

The commonality of neuropathic foot and associated complications including ulceration, infection, and Charcot joint arthropathy requires that the patient care team have a fundamental understanding of these pathologies and common treatment modalities. We review orthotic treatment modalities to assist clinicians with the management of patients with neuropathic foot.

Surgical management of Charcot neuroarthropathy

BACKGROUND

Charcot neuroarthropathy is one of the more devastating complications of diabetes. It is a progressive, destructive condition that is characterized by acute fracture, dislocation, and joint destruction in weight-bearing neuropathic foot. In its acute phase, it is often misdiagnosed and can lead to several deformities such as ulcerations and amputation. Early diagnosis and management is, therefore, imperative to avoid rapid progression.

OBJECTIVES

Review current literature on the diagnosis and management of diabetic patients with Charcot neuroarthropathy.

STUDY DESIGN

Narrative review.

METHODS

Particular attention is directed to the role of surgical management in achieving long term osseous stability and alignment so that appropriate footwear and bracing are possible.

CONCLUSION

Charcot neuroarthropathy is a serious and potentially limb-threatening lower extremity late complication of diabetes. Correct timing, adequate fixation and a long post-operative weightbearing period are key to optimizing reconstructive surgery.

CLINICAL RELEVANCE

Primary care providers who treat diabetic patients should be cognizant of the possible complication among patients with diabetic neuropathy of which includes Charcot neuroarthropathy. In this paper, discussion is provided on a rational approach to functional limb salvage with various surgical techniques when non-operative management fails.

Late corrective arthrodesis in nonplantigrade diabetic charcot midfoot disease is associated with high complication and reoperation rates

INTRODUCTION

Charcot arthropathy may lead to a loss of osteoligamentous foot architecture and consequently loss of the plantigrade alignment. In this series of patients a technique of internal corrective arthrodesis with maximum fixation strength was provided in order to lower complication rates.

MATERIALS/METHODS

21 feet with severe nonplantigrade diabetic Charcot deformity Eichenholtz stages II/III (Sanders/Frykberg II/III/IV) and reconstructive arthrodesis with medial and additional lateral column support were retrospectively enrolled. Follow-up averaged 4.0 years and included a clinical (AOFAS score/PSS), radiological, and complication analysis.

RESULTS

A mean of 2.4 complications/foot occurred, of which 1.5/foot had to be solved surgically. 76% of feet suffered from soft tissue complications; 43% suffered hardware-associated complications. Feet with only 2 out of 5 high risk criteria according to Pinzur showed significantly lower complication counts. Radiographs revealed a correct restoration of all foot axes postoperatively with superior fixation strength medially.

CONCLUSION

Late corrective arthrodesis with medial and lateral column stabilization in the nonplantigrade stages of neuroosteoarthropathy can provide reasonable reconstruction of the foot alignment. Nonetheless, overall complication/reoperation rates were high. With separation into low/high risk criteria a helpful guide in treatment choice is provided. This trial is registered with German Clinical Trials Register (DRKS) under number DRKS00007537.

[The Midfoot Fusion Bolt: a new perspective?]

BACKGROUND

There is no current guideline nor consensus regarding optimal surgical treatment of the midfoot Charcot. Due to the vast diversity of locations, it is difficult to make a general statement. Various different types of screws and plates are currently being used since they have been tested and declared to be most stable. The Midfoot Fusion Bolt is a new device which needs approval since long-term results are lacking. A short summary of currently published papers and results from our own institution are provided.

OBJECTIVES

The aim of this study was to investigate short-term results including complications and review published surveys.

METHODS

The Midfoot Fusion Bolt is a solid, intramedullary screw. An antegrade as well as a retrograde technique are postulated for insertion. A total of 16 patients/17 feet in two specialized foot and ankle centers were included. BMI, HbA1c, satisfaction rates, complication rates, and expert opinions were recorded.

RESULTS

The bolts were used an average of 21.17 months (range 3-55 months) in 16 patients/17 feet. Between 2009 and 2014, six bolts had to be removed. We encountered 4 cases of postoperative ulceration: 2 cases healed postoperatively, while the other 2 cases led to amputation. The average fusion rate was 92.35 %.

CONCLUSION

The Midfoot Fusion Bolt is no longer advised for single-device use only since there have been issues in terms of insufficient stability. However, stable conditions could be achieved with additional screws or plates, respectively. Prospective studies and biomechanical testing for general conclusions are still required to make a meaningful assessment.

Radiographic analysis of diabetic midfoot charcot neuroarthropathy with and without midfoot ulceration

BACKGROUND

The aim of this study was to evaluate weight-bearing radiographs in patients with and without foot ulcers diagnosed with midfoot Charcot neuroarthropathy (CN) secondary to diabetes mellitus.

METHODS

One hundred fourteen patients with midfoot CN (50 with foot ulcers and 64 without ulcers) were identified and included in this study. Nine radiographic measurements were made (7 in the sagittal plane and 2 in the transverse plane).

RESULTS

CN patients with foot ulcers had significantly greater deformity when assessing the lateral-talar first metatarsal angle, calcaneal pitch, cuboid height, medial column height, calcaneal-fifth metatarsal angle, talar declination, and lateral tibiotalar angle. Two measurements in the transverse plane (hindfoot-forefoot angle and AP talar first metatarsal angle) were not significantly different between the 2 groups. Of patients with foot ulcers, 24% had a lateral talar first metatarsal angle of less than -27 degrees and 80% had a negative cuboid height.

CONCLUSION

Sagittal plane deformities were more likely to be associated with foot ulceration in patients with CN than transverse plane deformities. Lateral column involvement was associated with a worse prognosis than medial column involvement, thus we believe progressive deformity of the lateral column should be monitored closely to prevent foot ulceration. Lateral column involvement could be identified by a decrease in the cuboid height, decreased calcaneal pitch, and decreased lateral calcaneal fifth metatarsal angle. This study can assist physicians in stratifying the risk for both ulceration and need for surgery in patients with CN based on reproducible radiographic measurements.

LEVEL OF EVIDENCE

Level III, comparative series.

Tibiocalcaneal arthrodesis in the high-risk foot

The present case series outlines the history and surgical treatment of 6 patients who underwent tibiocalcaneal arthrodesis from April 2002 to May 2012, all with external fixation as the primary or secondary fixation. Surgical intervention was performed by the same surgeon at the same facility. The indication for surgery was a nonbraceable Charcot deformity in 5 (83.3%) patients and bone and soft tissue infection complicating previous intramedullary hindfoot fusion in 1 (16.7%) patient. Talectomy was performed in 2 (33.3%) patients secondary to widespread osteomyelitis of the talus and in 4 (66.7%) patients secondary to avascular necrosis and/or disintegration and fragmentation of the remaining talus. The postoperative complications have been discussed in detail and their management outlined. At the most recent follow-up visit, all patients were independently ambulating on a braceable limb with or without the use of an assistive device. In conclusion, tibiocalcaneal arthrodesis is a reasonable option for limb salvage to produce community ambulators in the high-risk population. We emphasize that although multiple fixation options are available for tibiocalcaneal arthrodesis, a combination of internal and external fixation is vital to its success.