A biomechanical comparison of internal fixation techniques for ankle arthrodesis

Current concepts in ankle arthrodesis

Ankle osteoarthritis is primarily post traumatic and affects a younger population. It, therefore, not only has a negative effect on the quality of life but also impacts the working life of these patients. A thorough history, clinical examination followed by relevant investigations, radiological and hematological, can provide the necessary information to classify the severity and associated deformity of this condition. This will provide guidance to the necessary and appropriate commencement of treatment. Options include conservative or surgical which can be joint sparing or sacrificing procedures. Ankle arthrodesis, a joint sacrificing procedure, has long been the 'gold standard' and has stood the test of time in providing a pain free plantigrade foot. However, ankle arthroplasty, with newer materials and better understanding, is increasingly being considered for ankle arthritis. In regions with financial constraints and limited accessibility to modern implants ankle arthrodesis should be the preferentially offered surgical procedure. This article will briefly cover the pathophysiology of ankle arthritis, clinical presentation, and its surgical treatment with a focus on ankle arthrodesis.

Comparison of different internal fixation models in ankle arthrodesis using 3D finite-element analysis

BACKGROUND

The purpose of this study is to use three-dimensional finite-element analysis to better understand the biomechanical features of various internal fixators for ankle arthrodesis.

METHODS

We used finite-element analysis to compare four different types of internal fixations in ankle arthrodesis: Group A had three crossed screws (Ø6.5 mm); Group B had two crossed screws (Ø6.5 mm) and an anterior plate (Ø2.7 mm); Group C only had an anterior anatomical plate (Ø3.5 mm); Group D had one anterior anatomical plate (Ø3.5 mm) and one posterior-lateral screw (Ø6.5 mm). We adopted Ansys 21.0 software to analyze and compare the four types in terms of the displacement of the arthrodesis surface and the stress peak and stress distribution of these models under intorsion, extorsion, dorsiflexion torque, and neutral vertical load.

RESULTS

① Displacement of the arthrodesis surface: In Group A, the maximum displacement was larger than Group D under neutral vertical load and dorsiflexion torque but less than it under intorsion and extorsion torque. In Group B, the maximum displacement against dorsiflexion, neutral vertical load, intorsion, and extorsion was less than that in the other three fixation models. In Group C, the maximum displacement against the above four loading patterns were significantly higher than that in another three fixation models. ② Stress peak and stress distribution: based on the stress distribution of the four models, the peak von Mises stress was concentrated in the central sections of the compression screws, plate joints, and bending parts of the plates.

CONCLUSIONS

The fixation model consisting of two crossed screws and an anterior outperformed the other three fixation models in terms of biomedical advantages; thus, this model can be deemed a safe and reliable internal fixation approach for ankle arthrodesis.

Role of fibular autograft in ankle arthrodesis fixed using cannulated screws: a proportional meta-analysis and systematic review

Ankle arthrodesis is commonly performed to treat end-stage ankle osteoarthritis. The aim of this study was to determine whether the use of fibular autograft might increase the fusion rate and decrease the complication rate in ankle arthrodesis (AA) fixed using cannulated screws. To perform this PRISMA-compliant proportional meta-analysis, multiple databases were searched for studies in which patients undergone AA (using exclusively cannulated screws and augmented with fibular bone graft) were followed. The characteristics of the cohort, the study design, surgical details, the nonunion and complication rate at the longest follow-up were extracted and recorded. The modified Coleman Methodology Score (mCMS) was applied to appraise the quality of studies. Two groups were built: arthrodeses fixed with screws combined with cancellous autograft (G1) and arthrodeses fixed with screws combined with cancellous autograft and augmented with a lateral fibular onlay (G2). A third group (arthrodeses fixed with screws and no graft, G3) was extracted from previous literature for a further comparison. Overall, we included 306 ankles (296 patients) from ten series (ten studies). In G1 and G2 there were 118 ankles (111 patients) and 188 ankles (185 patients), respectively. In patients where cancellous autograft was used, a further augmentation with a fibular lateral strut autograft did not change significantly the nonunion (4% [95% CI 1-9] in G1 vs. 2% [95% CI 0-5) in G2, p = 0.99) nor the complication rate (18% [95% CI 0-36] in G1 vs. 13% [95% CI 6-21) in G2, p = 0.71). Upon comparison with 667 ankles (659 patients, G3) in which arthrodeses had been performed without grafting, the nonunion and complication rates did not differ significantly either (pooled estimates: 3% [95% CI 1-3) in G1 + G2 vs. 3% [95% CI 2-4] in G3, p = 0.73 for nonunion; 15% [8-23] in G1 + G2 vs. 13% [95% CI 9-17] in G3, p = 0.93 for complications). In ankle arthrodesis fixed with cannulated screws combined with cancellous autograft at the fusion site, a construct augmentation with a distal fibular onlay strut graft positioned laterally at the ankle joint does not reduce the risk of nonunion or complication. In general, the use of bone graft does not influence significantly the nonunion nor the complication rate as compared to non-grafted screw-fixed ankle arthrodeses.Kindly check and confirm the corresponding author mail id is correctly identified.It's all correct.

Tibiotarsal Arthrodesis with Retrograde Intramedullary Nail and RIA Graft: A Salvage Technique

Ankle arthrodesis is a commonly used salvage procedure in the management of post-traumatic ankle fractures, which often result in severe disability and may require the amputation of the distal third of the leg. Successful ankle arthrodesis relies on a thorough assessment of local and systemic risk factors to ensure optimal results. Failure to accurately assess these factors may lead to unsatisfactory results. High-energy trauma causing bone defects and soft tissue necrosis often results in osteomyelitis, a condition that poses a significant threat to the success of the arthrodesis procedure. It is important to apply a standardised surgical protocol to minimise the possibility of superficial and deep infection and limit damage to the neighbouring soft tissues. Therefore, it is critical to undertake surgical lavage and debridement and administer systemic and local antibiotic therapy, along with the use of a spacer, to eradicate infection prior to performing arthrodesis. In this study, we present our experience in the recovery of limbs with post-traumatic complications via tibio-astragalic or tibio-calcaneal arthrodesis using a retrograde intramedullary nail technique. The approach involves a multi-step procedure using a previous antibiotic spacer implant and an autologous bone graft (RIA). This study spanned a period from January 2014 to December 2021 and included 35 patients (12 women and 23 men) with a mean age of 47.8 ± 20.08 years (range: 22-85 years). Among the patients, 18 had osteomyelitis following AO 43 C3 fractures, and 9 of them had previous exposure and bone loss at the time of injury. The remaining cases included 10 patients with AO 44 C fracture outcomes and 7 patients with AO 44 B fracture outcomes. Our results emphasise the importance of the meticulous management of local and systemic risk factors in ankle arthrodesis procedures. The successful eradication of infection and subsequent arthrodesis can be achieved via the implementation of surgical lavage, debridement, and systemic and local antibiotic therapy using spacers. This surgical protocol implemented by us has yielded excellent results, saving affected limbs from post-traumatic complications and avoiding the need for amputation. Our study contributes to the existing knowledge supporting the use of retrograde arthrodesis with intramedullary nails in severe cases where limb salvage is the primary goal. However, further research and long-term follow-up studies are needed to validate these results and evaluate the effectiveness of this technique in a larger patient population.

A network meta-analysis of the efficacy of arthrodesis with various fixation methods in the treatment of advanced ankle osteoarthritis

This study aimed to compare the efficacy of arthrodesis with various fixation methods in the treatment of advanced ankle osteoarthritis. Thirty-two patients with osteoarthritis of the ankle (mean age 59.91±6.16 years) took part in the study. The patients were divided into 2 groups - Ilizarov apparatus (21 patients) and screw fixation (11 patients). Each group was also divided into subgroups based on etiology - posttraumatic and nontraumatic. The AOFAS and VAS scales were compared in the preoperative and postoperative periods. It was found that screw fixation was more effective in the treatment of late stages of osteoarthritis (OA) of the ankle during the postoperative period. Comparison of the AOFAS and VAS scales showed no significant differences between the groups in the preoperative period (p = 0.838; p = 0.937). After 6 months, the results were better in the screw fixation group (p = 0.042; p = 0.047). Complications were observed for a third of the patients (10 patients). 6 patients had pain in the operated limb (4 patients in the Ilizarov apparatus group). Three patients in the Ilizarov apparatus group developed a superficial infection, and one developed a deep infection. Different etiology did not affect the postoperative efficacy of arthrodesis. The choice of the type of should be related to a clear protocol for the presence of complications. When choosing the type of fixation for arthrodesis, a patient's condition as well as a surgeon's preferences should be taken into account.

Republication of "Total Ankle Replacement Conversion to Tibiotalocalcaneal Arthrodesis With Bulk Femoral Head Allograft and Pseudoelastic Intramedullary Nail Providing Sustained Joint Compression"

Tibiotalocalcaneal (TTC) arthrodesis is commonly performed to salvage a failed total ankle replacement. These salvage procedures are complicated by significant bone loss from the ankle replacement and are associated with low patient satisfaction. Here, we describe 2 cases of patients who presented with a failed total ankle replacement and underwent arthrodesis using a bulk femoral head allograft and a novel pseudoelastic intramedullary nail. The intramedullary nail contains an internal pseudoelastic element that adapts to bone resorption and settling allowing for compression to be maintained at the arthrodesis sites throughout healing. In the first case, a 65-year-old woman with a failed total ankle replacement underwent TTC arthrodesis. The second case involved an obese 53-year-old woman who had previously undergone 2 total ankle replacement procedures that resulted in unsuccessful outcomes. In both cases, union was demonstrated on computed tomographic scan by 6 months. At 2 years postsurgery, both patients were satisfied with the procedure. These cases provide preliminary evidence that tibiotalocalcaneal arthrodesis with a pseudoelastic IM nail and structural allograft is an appropriate treatment for failed total ankle replacements. Level of Evidence: Level IV, therapeutic, case series.

Improvement in clinical outcome and quality of life after arthroscopic ankle arthrodesis in paralytic foot drop

BACKGROUND

Paralytic foot-drop is a disabling deformity that results from nerve or direct muscle injuries. Palliative surgeries such as tendon transfer and ankle arthrodesis are reserved for permanent deformity, with the arthroscopic technique had not been widely studied before. This study aims to evaluate the clinical outcome and quality of life after arthroscopic ankle fusion of paralytic foot-drop deformity.

MATERIALS AND METHODS

The patients who were retrospectively enrolled in this study underwent arthroscopic ankle fusion for paralytic foot-drop deformity between March 2017 and December 2021. The American Orthopedic Foot and Ankle Society (AOFAS) ankle-hindfoot score and Cumberland Ankle Instability Tool (CAIT) were the measures used for clinical assessment. To judge the union, serial plain radiographs of the ankle were obtained. The preoperative and postoperative means were analyzed utilizing a two-tailed paired t-test, with a p value of less than 0.05 indicating statistical significance.

RESULTS

This study included 21 consecutive patients with a mean follow-up of 35.09 ± 4.5 months and a mean age of 41.5 ± 6.1 years. Highly significant improvements were observed between the preoperative and final follow-up means of the AOFAS score (from 57.6 ± 4.6 to 88.3 ± 2.7) and CAIT (from 12.1 ± 2.2 to 28.9 ± 1.01; p ˂ 0.00001 for both). All patients attained radiographic union and resumed their previous occupations without reporting serious adverse effects.

CONCLUSIONS

Arthroscopic ankle fusion is an effective, minimally invasive palliative surgery for patients suffering from permanent paralytic foot-drop deformity. This technique was shown to provide good functional and radiologic outcomes without significant complications.

LEVEL OF EVIDENCE

Retrospective cohort; level of evidence (IV).

The Effects of Tibialis Anterior Tenotomy on Wound Complications and Functional Outcomes After Anterior Fusion Plating for Severe Ankle Arthritis

Nonunion is known to be a relatively common complication following ankle arthrodesis. Various fixation techniques have been introduced to enhance the stability and to improve fusion rate. With the use of anterior plate supplementation, postoperative wound problems have been frequently reported despite better fusion rate. This study was performed to determine the effects of tibialis anterior (TA) tenotomy on wound complications and functional outcomes after anterior fusion plating for severe ankle arthritis. Forty-six patients who underwent ankle arthrodesis using anterior fusion plate were followed for more than 2 years. TA tenotomy was performed prior to wound closure in all patients. As a control group, 38 patients who underwent arthrodesis without TA tenotomy were analyzed. Functional outcomes were evaluated with Ankle Osteoarthritis Scale and Foot and Ankle Ability Measure. Wound complication rate, time to fusion, fusion rate, time to pain relief were evaluated. Mean Ankle Osteoarthritis Scale and Foot and Ankle Ability Measure scores significantly improved to 32.6 and 69.4 points at final follow-up, respectively. As compared to control group (33.8 and 67.7 points), there were no significant differences in functional outcomes. As postoperative wound complications, there were 1 case of wound dehiscence and 1 case of superficial wound infection. TA tenotomy group showed a significantly lower wound complication rate (4.3%) than control group (23.7%) (p < .001). While there were no significant differences in fusion rate, time to fusion, and time to pain relief between both groups, control group needed higher rate of implant removal. Ankle arthrodesis using anterior fusion plate in conjunction with TA tenotomy appears to be an effective surgical option for end-stage ankle arthritis, with excellent fusion rate and less wound complication rate. Although there were no specific functional deficits related to absence of TA tendon, further studies are needed to determine long-term effects of TA tenotomy in patients with a fused ankle.

Irritation from metalwork after ankle arthrodesis fixed using screws: a proportional meta-analysis and systematic review

OBJECTIVE

Ankle arthrodesis (AA) is often fixed using cannulated screws. The irritation from metalwork is a relatively common complication, but there is no consensus regarding the need to remove the screws on a systematic basis. The aim of this study was to determine (1) the proportion of screws removed after AA and (2) whether predictors of screw removal could be identified.

METHODS

This PRISMA-compliant systematic review was part of a larger previous protocol registered on the PROSPERO platform. Multiple databases were searched including studies in which patients undergone AA using screws as exclusive fixation method were followed. Data were harvested regarding the cohort, the study design, the surgical technique, the nonunion and complication rate at the longest follow-up. Risk of bias was assessed using the modified Coleman Methodology Score (mCMS).

RESULTS

Forty-four series of patients from thirty-eight studies (1990 ankles, 1934 patients) were selected. The average follow-up was 40.8 months (range 12-110). In all studies, hardware was removed due to symptoms reported by patients and related to the screws. The pooled proportion of removal of metalwork was 3% (95% CI 2-4). The pooled proportion of fusion was 96% (95%CI 95-98), while the pooled proportion of complications and reoperations (excluding the removal of metalwork) stood at 15% (95% CI 11-18) and 3% (95% CI 2-4), respectively. The mean mCMS (50.8 ± 8.1, range 35-66) revealed only an overall fair quality of studies. The univariate analysis and the multivariate model showed that the year of publication (R = - 0.004; p = 0.01) and the number of screws (R = 0.08; p = 0.01) were associated with the screw removal rate. Specifically, we found that over time the removal rate decreased by 0.4% per year and that the use of three screws instead of two reduced the risk of removal of metalwork by 8%.

CONCLUSIONS

In this review, removal of metalwork after ankle arthrodesis using cannulated screws was needed in 3% of cases at an average follow-up of 40.8 months. It was indicated only in case of symptoms related to soft tissue irritation from screws. The use of three screws was paradoxically related to a reduced risk of removal of screws as compared to two-screw constructs.

LEVEL OF EVIDENCE

Level IV, systematic review of Level IV.

EXPERIMENTAL SUBSTANTIATION OF THE BIOMECHANICAL EFFICIENCY OF THE ANTERIOR PLATE COMBINED WITH TWO SPONGIOUS SCREWS FOR ANKLE ARTHRODESIS

Актуальность. Несмотря на существующее значительное количество разнообразных методик, применяемых для артродеза голеностопного сустава, ряд авторов указывают на определенные технические сложности указанных операций, потерю коррекции заданного положения таранной и большеберцовой костей в процессе анкилозирования, несращения. Проблема совершенствования методики фиксации при артродезе голеностопного сустава требует новых решений. Цель провести сравнительный биомеханический анализ стабильности фиксации при артродезе голеностопного сустава тремя спонгиозными винтами и разработанной пластиной, комбинируемой с двумя спонгиозными винтами, методом конечных элементов. Материалы и методы. Методом конечных элементов выполнена оценка биомеханических характеристик трех вариантов систем фиксации голеностопного сустава при артродезе: три спонгиозных винта, разработанная пластина, комбинируемая с двумя спонгиозными винтами, проксимальный винт в пластине кортикальный, а также разработанная пластина, комбинируемая с двумя спонгиозными винтами, проксимальный винт в пластине с угловой стабильностью. Изучены напряжения и деформации при приложении различных видов нагрузок. Результаты. В модели фиксации голеностопного сустава передней пластиной, комбинируемой с двумя спонгиозными винтами и проксимальным кортикальным винтом, имплантаты и таранная кость испытывали наименьшие напряжения по сравнению с двумя другими моделями. Так, максимальное эквивалентное напряжение в имплантатах при втором варианте составило 68-124 МПа, при первом варианте 92-147 МПа, при третьем 130-331 МПа. Эквивалентное напряжение в таранной кости во втором варианте фиксации составило от 20 до 46 МПа, в первом и третьем вариантах 28-58 МПа и 47-65 МПа, соответственно. Показатели максимального контактного давления на границе большеберцовой и таранной костей оказались наибольшими в первом варианте по сравнению с двумя другими моделями (34 МПа, 31 МПа и 31 МПа соответственно). Заключение. Среди изученных систем фиксации голеностопного сустава для артродеза, применение передней пластины, комбинируемой с двумя спонгиозными винтами и проксимальным кортикальным винтом, является наиболее предпочтительным с точки зрения биомеханики.

Ankle Arthrodesis Combined With Mosaic Bone Autograft Transplantation for End-Stage Ankle Osteoarthritis With Large Cysts of Talar Dome

End-stage ankle osteoarthritis with large cysts of talar dome can be challenging to treat. Twenty patients diagnosed as end-stage ankle arthritis with large talar cysts between 04/2010 and 02/2016 were randomly divided into experimental group (10 cases) and conventional group (10 cases) by random number method. Patients in the experimental group were treated with ankle arthrodesis combined with a concomitant procedure of mosaic bone autograft transplantation, the conventional group under the ankle arthrodesis. The operation time, intraoperative blood loss, postoperative hospital stay, the time of bone union, and postoperative height of the talus between the 2 groups were compared. The preoperative and postoperative American Orthopaedic Foot and Ankle Society ankle-hindfoot scale score were also recorded and compared. There was no significant difference in the operation time, intraoperative blood loss, and postoperative hospital stay between the 2 groups. The postoperative height of the talus body and the time of bone union were better in the experimental group than that in the conventional group (p < .05). The results of follow-up showed that the American Orthopaedic Foot and Ankle Society scores of the conventional group were lower than those in the experimental group (p < .001). And the incidence of complication (10%) in the experimental group was significantly lower than that in the conventional group (40%). The use of tibiotalar arthrodesis combined with mosaic bone autograft transfer may be potentially an effective option for the treatment of end-stage ankle arthritis with large talar cysts.

Postoperative Findings of Common Foot and Ankle Surgeries: An Imaging Review

Foot and ankle surgery is increasingly prevalent. Knowledge of the mechanisms underlying common foot and ankle deformities is useful in understanding surgical procedures used to restore normal biomechanics. As surgical techniques evolve, it is important for the radiologist to be familiar with these procedures, their expected postoperative appearance, and potential complications. This article reviews the key imaging findings of a variety of common and important foot and ankle surgical procedures.

The Effects of Different Screw Combinations on the Initial Stability of Ankle Arthrodesis

BACKGROUND

The literature is scanty regarding the biomechanical effects of different thread configurations on the initial stability of ankle arthrodesis. This study aims to compare the initial stability of tibiotalar fusion site in ankle arthrodesis using cannulated screws with different thread designs.

METHODS

We biomechanically tested under cyclic loading the effects of different screw combinations on the initial stability of ankle arthrodesis. A total of 28 synthetic ankle models were divided into four groups: two partially threaded cancellous screws (group A), partially and fully threaded cancellous screws (group B), a partially threaded cancellous screw with a headless compression screw (group C), and a fully threaded cancellous screw and a headless compression screw (group D). Biomechanical variables including ultimate failure load, initial stiffness, ultimate stiffness, and failure angulation were analyzed.

RESULTS

There were no differences in any of the biomechanical variables among the four groups (P = .41 for ultimate failure load, P = .079 for initial stiffness, P = .084 for ultimate stiffness, and P = .937 for failure angulation).

CONCLUSIONS

Combinations of different cannulated screws showed similar results in terms of the stability and stiffness of the tibiotalar fusion site.

One-stage tibial deformity correction and ankle arthrodesis for ankle osteoarthritis and tibial malalignment after low tibial osteotomy

Introduction

There are no reports on one-stage corrective tibial opening wedge osteotomy and arthrodesis for osteoarthritis of the ankle and tibial malalignment after distal tibial osteotomy.

Presentation of case

The patient was a 70-year-old woman who presented with complaints of ankle pain and lower limb deformity after tibial osteotomy performed for ankle arthritis 17–18 years earlier. Clinical examination revealed marked swelling around the ankle joint and pain and tenderness at the joint line. Imaging showed tibial malalignment and severe osteoarthritic changes in the ankle. The patient had valgus deformity of 21° and recurvatum deformity of 4°. In two months, she admitted to Department of Orthopedics at Tokushima University Hospital in Japan and we performed one-stage corrective tibial opening wedge osteotomy and ankle arthrodesis with an anterolateral plate through a lateral longitudinal incision. After removal of the previous implants, the remaining articular cartilage and osteophytes were removed from the tibial and talar surfaces. After debridement of the talar trochlea and tibial plateau, the center of rotation and angular deformity of the tibia was cut transversely and a 1-cm bone graft obtained from the removed fibula was inserted into the osteotomy site, which decreased the tibial malalignment. An anterolateral locking plate was inserted over the anterior and lateral sides of the tibia, and the ankle was fused using 2 cannulated screws.

Discussion

The patient wore an above-knee splint for 6 weeks to avoid weight-bearing followed by gradual weightbearing with a brace thereafter. Osseous fusion was achieved after about 3.5 months. Radiographs obtained at the 2-year follow-up visit showed complete union of the tibia and talus. Full correction of valgus and recurvatum deformity was achieved, and the patient was able to perform daily activities with almost no pain.

Conclusion

We reported a rare case of ankle osteoarthritis and tibial malalignment that was successfully treated with one-stage corrective tibial opening wedge osteotomy and ankle arthrodesis using an anterolateral plate via a transfibular approach.

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Ankle osteoarthritis and malalignment can be followed by osteotomy.

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One-stage ankle arthrodesis and deformity correction should be considered.

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Anterolateral plate was useful for arthrodesis and correction.

Short- to Midterm Follow-up of Cemented Total Ankle Replacement Using the INBONE II: A Retrospective Chart Review

Background: Total ankle arthroplasty is a viable option for the treatment of end stage ankle arthritis. The purpose of this study is to report on the mid-term results with a cemented total ankle prosthesis, the Inbone™ II implant over a 5 year period. Methods: A retrospective, single-center chart and radiographic review of all patients with end stage ankle arthritis treated with Inbone™ II TAR) as the primary index procedure from 12/1/2012 to 3/1/2017. Clinical data were evaluated at 3 month, 6 month, 1 year and subsequent intervals for the study period. Preoperative diagnosis, pertinent patient demographics adjunctive procedures, implant associated complications, subsequent surgeries, and revisions were recorded. Results: 121 total ankles met our inclusion criteria. Patients had an INBONE™ II TAR implant placed with bone cement with a minimum of a 12 months follow up. Average age was 62.88 (range, 32-87) years, average body mass index was 32.74 (range, 21.8-56.04) kg/m2 and average follow up was 28.51(range, 12-69) months. Using the COFAS complication classification there were 14 minor, 11 moderate, and 5 major complications. 6/121 (5.0%) revisions which included: polyethylene exchange, device explant/fusion, and antibiotic spacer in situ. No complications over the course of this study ended in amputation. Conclusion: Total Ankle Arthroplasty utilizing the cemented INBONE™ II yielded good midterm results with regards to minor, moderate, and major complications. Rate of revision 6/121 (5.0%) was within the reported range with only 5 patients converted to fusion during the study period resulting in a 95% survivability at mid-term follow up.Levels of Evidence: Level IV: Retrospective case series.

Impact of Bone Graft on Fusion Rates in Primary Open Ankle Arthrodesis Fixated With Cannulated Screws: A Systematic Review

There is currently no consensus on the importance of bone graft use in ankle arthrodesis. Despite this, bone graft is widely used. We aimed to summarize the available literature on primary open ankle arthrodesis fixated with cannulated screws in order to assess the importance of bone graft in achieving more favorable rates of fusion. PubMed and Embase were queried for articles reporting on primary open ankle arthrodesis fixated with cannulated screws which specified use or non-use of bone graft. Pooled data analysis was performed. Modified Coleman Methodology Scores were calculated to assess reporting quality. Twenty-seven studies met our inclusion criteria and were divided into three groups: no bone graft (NBG), fibular onlay with bone graft (FOBG), and use of bone graft (BG). All three groups had comparable fusion rates of 94.7%, 95.3%, and 95.1% respectively (p = .98). Number needed to treat was 7 and Absolute Risk Reduction was 14.8%. The reviewed literature was largely of moderate quality, with an overall Coleman score of 60.6 and no significance between the 3 groups (p = .93). In conclusion, primary open ankle arthrodesis fixated with cannulated screws generally had favorable fusion rates, and bone graft use did not have a significant effect on union rates. The available literature suggests that bone graft may not be needed in routine tibiotalar arthrodesis in low-risk patients. It may more significantly impact patients who are at high-risk of fusion failure, and dedicated research on this high-risk subset of patients is required.

Open Ankle Arthrodesis: a Systematic Review of Approaches and Fixation Methods

BACKGROUND

Open ankle arthrodesis (OAA) remains the most widely used operation in end-stage ankle osteoarthritis. However, there is a large variation in terms of approach and fixation methods. The aim of this systematic review was to assess the effect of different approaches and fixation methods on the union rate, complication rate and functional outcome in OAA.

METHODS

A search of the online databases PubMed, Embase, and Cochrane library was performed to identify patients who underwent OAA with screw- and/or plate-fixation.

RESULTS

We identified 38 studies, including 1250 patients (1290 ankles). The union rate was 98% (95% CI 0.95-0.99) for the anterior, 96% (95% CI 0.92-0.98) for the lateral and 96% (95% CI 0.68-1.00) for the combined medial/lateral approach. Screw-fixation achieved an overall union rate of 96% (95% CI 0.93-0.98) and plate-fixation 99% (95% CI 0.96-0.99). The overall complication rate was 14%, 16% and 31% for the anterior, lateral and combined medial/lateral approaches respectively. It stood at 18% for screw-fixation and 9% for plate-fixation. The infection rate was 4%, 6% and 8% for the anterior, lateral and combined approaches respectively. Screw-fixation had an infection rate of 6% and plate-fixation 3%. The postoperative AOFAS scores were 76.8, 76.5 and 67.6 for the anterior, lateral and combined approaches respectively and 74.9 for screw- compared to 78.5 for plate-fixation. These differences did not reach statistical significance.

CONCLUSION

This study, the first of its kind, found little difference in terms of results between approach and fixation method used in OAA.

LEVEL OF EVIDENCE

Level IIa.

Closed arthrodesis in infected neuropathic ankles using Ilizarov ring fixation

AIMS

Infected and deformed neuropathic feet and ankles are serious challenges for surgical management. In this study we present our experience in performing ankle arthrodesis in a closed manner, without surgical preparation of the joint surfaces by cartilaginous debridement, but instead using an Ilizarov ring fixator (IRF) for deformity correction and facilitating fusion, in arthritic neuropathic ankles with associated osteomyelitis.

METHODS

We retrospectively reviewed all the patients who underwent closed ankle arthrodesis (CAA) in Ilizarov Scientific Centre from 2013 to 2018 (Group A) and compared them with a similar group of patients (Group B) who underwent open ankle arthrodesis (OAA). We then divided the neuropathic patients into three arthritic subgroups: Charcot joint, Charcot-Maire-Tooth disease, and post-traumatic arthritis. All arthrodeses were performed by using an Ilizarov ring fixator. All patients were followed up clinically and radiologically for a minimum of 12 months to assess union and function.

RESULTS

The union rate for Group A was 81% (17/21) while it was 84.6% (33/39) for Group B. All the nonunions in Group A underwent revision with an open technique and achieved 100% union. Mean duration of IRF was 71.5 days (59 to 82) in Group A and 69 days (64.8 to 77.7) in Group B. The American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot score was similar in both groups. The postoperative hospital stay was shorter in Group A (21 days (SD 8)) than Group B (28 days (SD 9)). In the latter Group there were more problems with wound healing and greater requirement for antibiotic treatment. The mean operating time was 40 minutes (SD 9) in Group A compared to 80 minutes (SD 13) in Group B. Recurrence of infection occurred in 19% (4/21) and 15.5% (6/39) for Group A and Group B respectively.

CONCLUSION

We found CAA using an IRF to be an effective method for ankle arthrodesis in infected neuropathic foot and ankle cases and afforded comparable results to open methods. Due to its great advantages, Ilizarov method of CAA should always be considered for neuropathic ankles in suitable patients. Cite this article: Bone Joint J 2020;102-B(4):470-477.

PRE-PLANNING ANKLE ARTHRODESIS USING 3D RECONSTRUCTED TOMOGRAPHIES

OBJECTIVE

To implement one analysis method of the ankle bone contour that could make a more precise ankle arthrodesis.

METHODS

Twenty tomographies were submitted to 3D reconstruction. Seven points of anatomic interest for ankle arthrodesis with the three screws technique were marked with a triplannar marker. The median of the position of markers was estimated, and the union of the seven median points allow the construction of one median ankle for that population. Using this median ankle, sizes and angles for the screws position were determined.

RESULTS

Two median ankles were reconstructed, left and right. The position of the screw passage were determined considering the anatomical parameters. In the right ankle the lateral to medial screw should enter 4.56 cm and 0.79 above and posterior to lateral malleolus, with one inclination of 17.34° in relation to tibial longitudinal axis; and 0° in relation to tibial axial plane. The position for the other two screws is also described.

CONCLUSION

Our article is the first to presents one precise guide for ankle arthrodesis based on a populational assessment. Level of evidence II, Diagnostic Studies.

A Comparison of Talar Surface Area Occupied by 2- Versus 3-Screw Fixation for Ankle Arthrodesis

Background. Ankle arthrodesis is a procedure utilized in the treatment of end-stage ankle arthritis. Internal fixation with screws is traditionally relied on to achieve union. Although the use of screw fixation alone has produced satisfactory outcomes, nonunion rates can range from 9% to as high as 35%. Adding an additional screw to the traditional 2-screw fixation construct may improve the likelihood of union by adding strength and stiffness; however, this addition may counteract the theoretical fusion enhancement benefit by reducing the joint surface area (SA) available for fusion. Methods. A cadaver study was performed to compare the amount of SA lost from a standard 2-screw (group 1) versus the 3-screw ankle fusion construct (group 2). A total of 10 fresh cadaveric below-knee specimens were used. Cannulated 7.0-mm partially threaded screws were placed across the ankle joint. Each talus was examined to precisely determine joint SA loss following each procedure. Results. The mean total talus SA in group 1 was 1833.71 mm² compared with 2125.76 mm² in group 2. The mean SA lost by the 2-screw construct was 5.91%, versus 9.51% in the 3-screw construct group. The talus SA loss percentage difference between groups reached statistical significance (P = .0220). Conclusion. The addition of a third 7.0-mm screw to a 2-screw ankle fusion construct raised the percentage of joint surface lost from 5.91% to 9.5%. Clinical Relevance. Surgeons may consider using extra-articular plates with 1 or 2 intra-articular screws instead of the traditional 3-screw construct if there is an elevated concern for nonunion. Levels of Evidence: Level IV: Cadaveric case series.

Tibiotalar Arthrodesis Using a Hybrid Technique with a New Low-profile Anatomic Plate and Two Compression Screws: First One-year Results of Twenty Patients

Background:

The aim of this prospective study was to evaluate and analyse the first clinical results of a recently developed low-profile anatomic plate in combination with two headless compression screws for tibiotalar arthrodesis.

Methods:

The case series involved 20 consecutive patients who underwent ankle arthrodesis using a hybrid technique. Radiographs were obtained at 6 and 12 weeks and 1 year postoperatively. The outcome was evaluated by using AOFAS and SF 12-questionnaire. Any complications related to the arthrodesis were recorded.

Results:

The follow-up rate was 100%. Patients mean age at the time of surgery was 60.1 years (range, 40-79). Arthrodesis with full weight-bearing occurred in every patient within 12 weeks postoperatively. There were no patients with delayed union, non-union, infection or implant failure. AOFAS Score and SF-12 scores increased considerably compared to preoperatively.

Conclusion:

The hybrid technique for ankle arthrodesis is a tibiotalar compression with screws in combination with rigid anterior plate fixation. Our clinical results demonstrated no implant failure, no infection and fusion in any of the 20 patients. Further studies are necessary to support our first results.

Total Ankle Replacement Conversion to Tibiotalocalcaneal Arthrodesis With Bulk Femoral Head Allograft and Pseudoelastic Intramedullary Nail Providing Sustained Joint Compression

Tibiotalocalcaneal (TTC) arthrodesis is commonly performed to salvage a failed total ankle replacement. These salvage procedures are complicated by significant bone loss from the ankle replacement and are associated with low patient satisfaction. Here, we describe 2 cases of patients who presented with a failed total ankle replacement and underwent arthrodesis using a bulk femoral head allograft and a novel pseudoelastic intramedullary nail. The intramedullary nail contains an internal pseudoelastic element that adapts to bone resorption and settling allowing for compression to be maintained at the arthrodesis sites throughout healing. In the first case, a 65-year-old woman with a failed total ankle replacement underwent TTC arthrodesis. The second case involved an obese 53-year-old woman who had previously undergone 2 total ankle replacement procedures that resulted in unsuccessful outcomes. In both cases, union was demonstrated on computed tomographic scan by 6 months. At 2 years postsurgery, both patients were satisfied with the procedure. These cases provide preliminary evidence that tibiotalocalcaneal arthrodesis with a pseudoelastic IM nail and structural allograft is an appropriate treatment for failed total ankle replacements.

Level of Evidence:

Level IV, therapeutic, case series.

Posterolateral plate fixation with Talarlock® is more stable than screw fixation in ankle arthrodesis in a biomechanical cadaver study

BACKGROUND

A number of studies report on limitations of the screw arthrodesis in severe malalignment of the hindfoot, neuropathic deformity, poor bone quality and osteoporosis.

METHODS

Fourteen anatomically correct polyurethane foam models of the right leg (Sawbones Europe, Malmö, Sweden) and eighteen fresh-frozen human lower leg specimens (9 pairs) were used for the comparative biomechanical testing.

RESULTS

The statistical analysis of the stiffness of the fixation developed a significant difference in favor of the plate in all test directions.

CONCLUSIONS

The excellent biomechanical results are very promising and we hope for a reduction of the pseudarthrosis rate and shorten the postoperative treatment phase.

An original fibular shortening osteotomy technique in tibiotalar arthrodesis

Tibiotalar arthrodesis (TTA) is the gold-standard treatment for advanced ankle osteoarthritis. We describe an original fibular shortening osteotomy (FSO) performed during TTA, to allow complete talar ascension and reduce the nonunion rate. Forty-two FSOs were associated to TTA (19 fixed by cross-screwing and 23 by anatomic plates) and assessed clinically and radiographically. At 24.7 months' follow-up, fusion rates were 97.6% for TTA and 100% for FSO, with mean fusion time of 5.2 months. One infection and 1 nonunion (4.7%) required further surgery, with complete resolution. Radiological and clinical outcome in TTA, lack of specific complications of FSO and ease of implementation encourage us to publish the technique.

Comparison of Ankle Fusion Rates With and Without Anterior Plate Augmentation

BACKGROUND

The optimal fixation construct for tibiotalar arthrodesis continues to be debated. While biomechanical data and clinical series support anterior plate augmentation, comparative studies assessing its use are sparse. The purpose of this study was to compare the rates of successful tibiotalar arthrodesis with and without anterior plate augmentation of a compression screw construct.

METHODS

We studied 64 patients (65 ankles) undergoing tibiotalar arthrodesis done by a single surgeon over a 10-year period (2006-2016) with anterior plate augmentation beginning in 2010. Twenty-six ankles had a construct using compression screws only and 39 ankles had anterior plate augmentation of a compression screw construct. We reviewed clinical notes, operative reports, and postoperative radiographs to evaluate for union, incidence of revision, and postoperative complications.

RESULTS

The nonunion rate in the compression screw (CS) cohort was 15.4% and 7.7% in the anterior plate augmentation (AP) cohort ( P = .33). The revision rate was 7.7% in the CS group and 2.6% in the AP cohort ( P = .34). The use of autograft harvested through a separate incision was 19.2% and 17.9% in the CS and AP cohorts, respectively. There were 2 deep postoperative infections in the AP group and none in the patients with CS only ( P = .24). There were no superficial wound complications in either group.

CONCLUSION

Anterior plate augmentation was a viable fixation strategy in tibiotalar arthrodesis. In a trend toward an improved rate of fusion and decreased revision rate in the anterior plate augmentation cohort.

LEVEL OF EVIDENCE

Level III, retrospective comparative series.

Results of Arthroscopic Ankle Arthrodesis with Fixation Using Two Parallel Headless Compression Screws in a Heterogenic Group of Patients

BACKGROUND

As orthopedic surgeons become skilled in ankle arthroscopy technique and evidence -based data is supporting its use, arthroscopic ankle arthrodesis (AAA) will likely continue to increase, but stabilization methods have not been described clearly. We present a technique for two parallel 7.3-mm headless compression screws fixation (HCSs) for AAA in cases of ankle arthritis with different etiology, both traumatic and non-traumatic, including neuromuscular and inflammatory patients.

MATERIALS AND METHODS

We retrospectively verified 24 consecutive patients (25 ankles) who underwent AAA between 2011 and 2015. The average follow-up was 26 months (range 18 to 52 months). Arthrodesis was performed in 16 patients due to posttraumatic arthritis (in 5 as a sequela of pilon, 6 ankles, 3 tibia fractures, and 2 had arthritis due to chronic instability after lateral ligament injury), in 4 patients due to neuromuscular ankle joint deformities, and in 4 patients due to rheumatoid arthritis.

RESULTS

Fusion occurred in 23 joints (92%) over an average of 12 weeks (range 6 to 18 weeks). Ankle arthrodesis was not achieved in 2 joints (8%), both in post-pilon fracture patients. The correct foot alignment was not achieved in 4 feet (16%). None of the treated patients required hardware removal.

CONCLUSION

The presented technique was effective in achieving a high fusion rate in a variety of diseases, decreasing intra- and post-operative hardware complications while maintaining adequate bone stability.

Ankle Arthrodesis: A Retrospective Analysis Comparing Single Column, Locked Anterior Plating to Crossed Lag Screw Technique

Ankle arthrodesis is performed to eliminate pain due to end-stage osteoarthritis, regardless of etiology. This procedure remains the reference standard treatment for end-stage ankle arthritis, despite recent advancements in total ankle replacement. The objective of the present study was to retrospectively evaluate the radiographic and clinical fusion rates and time to bony fusion for patients who underwent ankle arthrodesis using an anterior approach with a single column locked plate construct versus crossed lag screws. We identified 358 patients who had undergone ankle arthrodesis from January 2003 to June 2013. Of the 358 patients, 83 (23.2%) met the inclusion criteria for the present study. Of the 83 included patients, 47 received locked anterior (or anterolateral) plate fixation, and 36 received crossed lag screw constructs. The overall nonunion rate was 6.0% (n = 5), with 1 nonunion in the anterior plate group (2.1%) and 4 nonunions in the crossed lag screw group (11.1%; p = .217). No differences were identified between the 2 groups for normal talocrural angle [χ² (1) = 0.527; p = .468], normal tibial axis/talar ratio [χ² (1) = 0.004; p = .952], and lateral dorsiflexion angle (p = .565). Based on our findings in similar demographic groups, ankle arthrodesis using locked anterior plate fixation is a safe technique with similar complication rates and radiographic outcomes to those of crossed lag screws.

Ankle Arthrodesis Using an Anterior Titanium Dual Locked Plating Construct

Ankle arthrodesis is currently the reference standard treatment for end-stage tibiotalar arthrosis. The fusion rates have varied in the published data from 59% to 100%. We reviewed 60 cases of consecutive anterior ankle arthrodesis using an anterior dual locked plating construct with respect to the fusion rate, time to fusion, pain relief, and complications. The patients were followed up for a mean of 1.1 years (range 16 weeks to 4 years). We found that our fusion rate was 97% for ankles not requiring structural allograft. The mean interval to fusion was 11.7 weeks, excluding those with a structural allograft. The mean visual analog scale pain scores decreased from 7 preoperatively to 2 at the final follow-up visit. Anterior ankle arthrodesis with dual locked plating provides excellent results with respect to the fusion rate with a low complication rate.

Arthroscopic arthrodesis for ankle arthritis without bone graft

Background

Ankle arthrodesis is considered by many to be the standard operative treatment for end-stage ankle arthritis. The purpose of this study was to perform a new technique for ankle joint surface and determine the outcome for the union rates of ankle arthroscopic arthrodesis.

Methods

A total of 68 patients with posttraumatic arthritis, primary osteoarthritis, and rheumatoid arthritis were treated by ankle arthroscopic arthrodesis between May 2007 and December 2012. Our surgical indication was deformity less than 15° measured by weight-bearing radiographs. Firstly, the remaining articular cartilage was removed with different curettes and shavers. Then, the new technique (microfracture) was done at tibiotalar surfaces. Finally, the ankle was fixed with two cannulated percutaneous screws. The wound healing, complications, postoperative radiographs, and American Orthopaedic Foot and Ankle Society (AOFAS) score were evaluated.

Results

The average follow-up time was 32 months (range 25–58 months). There was no bone grafting, and a fusion rate of 100% was achieved. The average fusion time was 12.1 weeks. One patient developed superficial infection at 2 weeks postoperatively and was cured by nonsurgical treatment. No deep infections, deep venous thrombosis, or revision surgery were observed. Screws had been removed in four patients because of prominence. One patient had fusion in the subtalar joint because of arthritis at 5 years postoperatively. At the last follow-up, radiographic signs of developed or progressing arthritis were observed in nine patients at subtalar joint and in four patients at talonavicular joint. At 1-year follow-up, the mean AOFAS ankle/hindfoot score had increased to 84 from a mean preoperative value of 38 (P < 0.01).

Conclusions

Arthroscopic arthrodesis provides surgeons with an alternative to traditional open techniques for the management of severe ankle arthritis. Our data show that preparation of the joint surface with microfracture is an effective technique to increase the union rate of arthroscopic ankle arthrodesis, while bone graft and other promoting substances are not necessary to be routinely used.

Electronic supplementary material

The online version of this article (doi:10.1186/s13018-016-0490-y) contains supplementary material, which is available to authorized users.

Ankle arthrodesis: A systematic approach and review of the literature

Ankle arthrodesis is a common treatment used for patients with end-stage ankle arthritis (ESAA). The surgical goal of ankle arthrodesis is to obtain bony union between the tibia and talus with adequate alignment [slight valgus (0°-5°)], neutral dorsiflexion, and slight external rotation positions) in order to provide a pain-free plantigrade foot for weightbearing activities. There are many variations in operative technique including deferring approaches (open or arthroscopic) and differing fixation methods (internal or external fixation). Each technique has its advantage and disadvantages. Success of ankle arthrodesis can be dependent on several factors, including patient selection, surgeons' skills, patient comorbidities, operative care, etc. However, from our experience, the majority of ESAA patients obtain successful clinical outcomes. This review aims to outline the indications and goals of arthrodesis for treatment of ESAA and discuss both open and arthroscopic ankle arthrodesis. A systematic step by step operative technique guide is presented for both the arthroscopic and open approaches including a postoperative protocol. We review the current evidence supporting each approach. The review finishes with a report of the most recent evidence of outcomes after both approaches and concerns regarding the development of hindfoot arthritis.

New Technique for Tibiotalar Arthrodesis Using a New Intramedullary Nail Device: A Cadaveric Study

Introduction. Ankle arthrodesis is performed in a variety of methods. We propose a new technique for tibiotalar arthrodesis using a newly designed intramedullary nail. Methods. We proposed development of an intramedullary device for ankle arthrodesis which spared the subtalar joint using a sinus tarsi approach. Standard saw bones models and computer assisted modeling and stress analysis were used to develop different nail design geometries and determine the feasibility of insertion. After the final design was constructed, the device was tested on three cadaveric specimens. Results. Four basic nail geometries were developed. The optimal design was composed of two relatively straight segments, each with a different radius of curvature for their respective tibial and talar component. We successfully implemented this design into three cadaveric specimens. Conclusion. Our newly designed tibiotalar nail provides a new technique for isolated tibiotalar fusion. It utilizes the advantages of a tibiotalar calcaneal nail and spares the subtalar joint. This design serves as the foundation for future research to include compression options across the tibiotalar joint and eventual transition to clinical practice.

Biomechanical evaluation of a second generation headless compression screw for ankle arthrodesis in a cadaver model

BACKGROUND

Many types of screws, plates, and strut grafts have been utilized for ankle arthrodesis. Biomechanical testing has shown that these constructs can have variable stiffness. More recently, headless compression screws have emerged as an evolving method of achieving compression in various applications but there is limited literature regarding ankle arthrodesis. The aim of this study was to determine the biomechanical stability provided by a second generation fully threaded headless compression screw compared to a standard headed, partially threaded cancellous screw in a cadaveric ankle arthrodesis model.

MATERIALS AND METHODS

Twenty fresh frozen human cadaver specimens were subjected to simulated ankle arthrodesis with either three standard cancellous-bone screws (InFix 7.3mm) or with three headless compression screws (Acumed Acutrak 2 7.5mm). The specimens were subjected to cyclic loading and unloading at a rate of 1Hz, compression of 525 Newtons (N) and distraction of 20N for a total of 500 cycles using an electromechanical load frame (Instron). The amount of maximum distraction was recorded as well as the amount of motion that occurred through 1, 10, 50, 100, and 500 cycles.

RESULTS

No significant difference (p=0.412) was seen in the amount of distraction that occurred across the fusion site for either screw. The average maximum distraction after 500 cycles was 201.9μm for the Acutrak 2 screw and 235.4μm for the InFix screw. No difference was seen throughout each cycle over time for the Acutrak 2 screw (p-value=0.988) or the InFix screw (p-value=0.991).

CONCLUSION

Both the traditional InFix type screw and the second generation Acumed Acutrak headless compression screws provide adequate fixation during ankle arthrodesis under submaximal loads.

CLINICAL RELEVANCE

There is no demonstrable difference between traditional cannulated partially threaded screws and headless compression screws studied in this model.