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INTRODUCTION: metatarsophalangeal resection arthroplasty is considered a salvage surgical procedure able to improve the quality of life of patients with major forefoot deformities. MATERIAL AND METHODS: a retrospective observational study of 31 patients (36 feet) with major forefoot deformities operated at our institution was performed. Thirty two feet required additional surgery involving the first ray, most of them (72.2%) through MTP joint fusion. The mean follow-up period was 10.3 ± 4.6 years. Most patients were women (87.1%), the mean age was 74.2 ± 11.5 years. RESULTS: at the final follow-up, mean AOFAS score was 77.9 ± 10.2 points and mean MOxFQ score was 18.3 ± 8.3 points. Visual analog scale (VAS) for pain improved significantly from 7.5 ± 1.2 points to 3.4 ± 2.1 points on average. Good clinical results were also reported on ability to put on shoes comfortably. The mean resection arthroplasty spaces at the end of the study were 1.3, 1.8, 2.5 and 4.4 mm, for second to fifth rays, respectively. The mean sizes of remodeling osteophytes at the end of the study were 1.6, 1.4, 1.1 and 0.7 mm, respectively. Significant improvement was also achieved in the hallux valgus angle (HVA) and intermetatarsal angle (IMA) at the end of the study. CONCLUSION: in our experience, metatarsophalangeal resection arthroplasty continues to be a valid choice in patients with major forefoot deformities, with satisfactory long-term clinical and radiographic results.

INTRODUCCIÓN: la artroplastía de resección metatarsofalángica se considera un procedimiento quirúrgico de salvamento capaz de mejorar la calidad de vida de pacientes con deformidades importantes en el antepié. MATERIAL Y MÉTODOS: se realizó un estudio observacional retrospectivo de 31 pacientes (36 pies) con deformidades importantes en el antepié operados en nuestra institución. Treinta y dos pies requirieron cirugía adicional que involucró el primer metatarsiano, la mayoría de ellos (72.2%) a través de la fusión de la articulación metatarsofalángica. El período de seguimiento promedio fue 10.3 ± 4.6 años. La mayoría de los pacientes fueron mujeres (87.1%), con una edad promedio de 74.2 ± 11.5 años. RESULTADOS: en la última visita de seguimiento, la puntuación AOFAS promedio fue de 77.9 ± 10.2 puntos y la puntuación MOxFQ promedio fue de 18.3 ± 8.3 puntos. La escala visual analógica (EVA) para el dolor mejoró significativamente, pasando de 7.5 ± 1.2 puntos a 3.4 ± 2.1 puntos de media. También se constataron buenos resultados clínicos en cuanto a la capacidad de calzarse con comodidad. Los espacios de resección promedio al final del estudio fueron 1.3, 1.8, 2.5 y 4.4 mm para el segundo al quinto radio, respectivamente. Los tamaños promedio de los osteofitos por remodelación al final del estudio fueron de 1.6, 1.4, 1.1 y 0.7 mm, respectivamente. También se logró una mejora significativa en el ángulo de hallux valgus (AHV) y en el ángulo intermetatarsiano (IMA) al final del estudio. CONCLUSIÓN: en nuestra experiencia, la artroplastía de resección metatarsofalángica sigue siendo una opción válida en pacientes con deformidades graves del antepié, con resultados clínicos y radiográficos satisfactorios a largo plazo.

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PURPOSE: The minimally invasive Chevron-Akin (MICA) is considered the third generation of minimally invasive hallux valgus (HV) surgery, and its original description included fixation of the Akin osteotomy with a screw. The aim of this study is to evaluate a series of patients undergoing HV correction using the MICA technique without screw fixation of the Akin osteotomy. METHODS: We retrospectively evaluated 58 consecutive patients who underwent surgical correction for HV between August 2018 and March 2020. A total of 69 feet were evaluated with a minimum follow-up of 2 years. Clinical outcomes such as pain (VAS), function (AOFAS), range of movement, criteria personal satisfaction and complications were evaluated. RESULTS: The AOFAS score (mean ± standard deviation) significantly improved from 57.0 ± 8.6 preoperatively to 93.9 ± 8.7 postoperatively (p < .001) with a minimum follow-up of 2 years. The VAS score improved from 6.0 ± 1.8 preoperatively to 0.6 ± 1.4 at 2-year follow-up (p < .001), and the hallux valgus angle reduced from 39.7 ± 6.9 to 8.9 ± 9.0 (p < .001). The majority of patients (95.6%) reported the result as excellent or good, and the most common complication was the need to remove the screw (7.2%). CONCLUSIONS: The use of MICA without Akin osteotomy fixation resulted in successful correction of hallux valgus with improvements in clinical and radiographic parameters. LEVEL OF EVIDENCE: IV, case series.

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BACKGROUND: Percutaneous metatarsophalangeal arthrodesis is an option for the treatment of hallux rigidus in more advanced cases. The aim of this study was to investigate the clinical and radiographic results at least 2 years after percutaneous metatarsophalangeal arthrodesis in patients with hallux rigidus. METHODS: This is a case series of consecutive patients undergoing percutaneous metatarsophalangeal arthrodesis in patients with hallux rigidus grades III and IV with a minimum of 24 months of clinical and radiographic follow-up. The primary outcome was clinical assessment using the Visual Analog Scale for Pain (VAS). Secondary outcomes included American Orthopedic Foot & Ankle Society (AOFAS) score, patient satisfaction, complications, and bone healing (radiographic analysis). RESULTS: Between August 2017 and February 2020, 29 feet (24 patients) underwent percutaneous metatarsophalangeal arthrodesis. The mean follow-up was 38.4 (range 24-54) months. There was an improvement in the pain (VAS) from 7.8 to 0.6 (p < 0.001) and in the AOFAS score from 49.9 to 83.6 (p < 0.001). There was a rate of bone union of 82.8% and screw removal of 13.8%. All patients considered the result to be excellent or good. CONCLUSION: The treatment of grade III and IV hallux rigidus with percutaneous metatarsophalangeal arthrodesis demonstrated high patient satisfaction and significantly improves in clinical outcomes but the nonunion rate was higher than reported outcomes for open 1st metatarsophalangeal joint arthrodesis. LEVEL OF EVIDENCE: IV, case series.

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PURPOSE: This study aimed to evaluate the effect of variations in bony and soft tissue foot widths on clinical and functional outcomes after hallux valgus correction with the Lapidus procedure. METHODS: Forty-three feet in 35 patients with a mean follow-up of 18.5 months undergoing the LP were reviewed. Clinical and functional data were assessed with the VAS for pain, AOFAS Scale, LEFS and SF-12 health survey, which is divided into physical and mental health composite scales (PCS-12 and MCS-12). Radiographic analysis of forefoot width was based on bony and soft tissue limits. Intermetatarsal-angle and HV-angle were also assessed. RESULTS: Bony width changed significantly from 95.5 mm to 84.2 mm (11.8%) and soft tissue width from 107.12 mm to 100.84 mm (5.86%) (p < 0.001). IMA and HVA improved significantly. Significant clinical and functional improvements were observed, except in MCS-12. In simple linear regression, correlation was found between variations of bony width with Δ-AOFAS and Δ-PCS-12, meaning that as the forefoot narrows, their values increase (p = 0.02 and p = 0.005, respectively). It was also related to Δ-IMA, meaning that the forefoot narrows as these parameters improve (p < 0.001 and p < 0.001). Soft tissue width was related to Δ-PCS-12 and Δ-AIM. In multiple linear regression, the strongest correlation was between bony width variation and Δ-IMA (p = 0.029, r2 = 0.22). CONCLUSION: Forefoot narrowing was correlated with improved clinical and functional outcomes, as measured by AOFAS and PCS-12. In addition, correction of the radiographic parameters, mainly IMA, reflected on a significant decrease in the forefoot width.

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Introducción: Las fracturas del metatarso son las lesiones traumáticas más comunes del pie, y las del primer metatarsiano son las cuartas en frecuencia. El tratamiento funcional de las fracturas metatarsianas consiste en el apoyo efectivo y precoz, sin inmovilización del miembro. Objetivo: Comparar la efectividad del tratamiento funcional en las fracturas del primer metatarsiano con los tratamientos convencionales Métodos: Se realizó un estudio analítico, observacional, retrospectivo, de casos y controles, en 102 fracturas del primer metatarsiano durante un período de ocho años. La muestra incluyó a pacientes de ambos sexos, entre 16 y 65 años de edad. Se comparó el tratamiento funcional con los tratamientos ortopédico y quirúrgico. Las fracturas fueron clasificadas según su localización, recomendación terapéutica y tratamiento efectuado. Los resultados fueron evaluados en función de la duración de la incapacidad temporal y las complicaciones. Resultados: 48 fracturas fueron tratadas con el método funcional y 41 mediante descarga e inmovilización. Los 13 pacientes con criterio de indicación quirúrgica fueron intervenidos mediante reducción y osteosíntesis. Se obtuvo una menor duración de la incapacidad y menos complicaciones con el tratamiento funcional que con los tratamientos convencionales. Conclusiones: En los últimos años ha aumentado la tendencia a tratar las fracturas metatarsianas de manera conservadora y muchos autores recomiendan el método funcional como tratamiento de elección. Este proporciona una curación más temprana y ocasiona menos complicaciones que los tratamientos convencionales(AU)

Introduction: Metatarsal fractures are the most common traumatic injuries of the foot, and those of the first metatarsal are the fourth in frequency. The functional treatment of metatarsal fractures consists of effective and early support, without limb immobilization. Objective: To compare the effectiveness of functional treatment in fractures of the first metatarsal with conventional treatments. Methods: An analytical, observational, retrospective, case-control study was conducted on 102 first metatarsal fractures over a period of eight years. The sample included patients of both sexes, between 16 and 65 years of age. Functional treatment was compared with orthopedic and surgical treatments. The fractures were classified according to location, therapeutic recommendation and treatment. The results were evaluated according to the duration of the temporary incapacity and the complications. Results: Forty eight fractures were treated with the functional method and 41 by offloading and immobilization. The thirteen patients with surgical indication criteria were operated by reduction and osteosynthesis. A shorter duration of disability and fewer complications were achieved with functional treatment than with conventional treatments. Conclusions: In recent years, the tendency to treat metatarsal fractures conservatively has increased and many authors recommend the functional method as the treatment of choice. This provides earlier healing and causes fewer complications than conventional treatments(AU)

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During the last 2 decades, there was an increasing interest in mini-invasive procedures for hallux valgus correction. In this scenario the Bösch technique appears to be a reproducible distal metatarsal osteotomy (DMO) to achieve a proper correction. Our DMO variant, called BC, was planned to combine the stability and predictability of the chevron osteotomy, with the power of correction, low surgical time and mini-invasive approach of the Bösch-SERI technique. The purpose of this investigation is to describe the surgical technique and report the results of this modified procedure at a minimum 2-year follow-up. Sixty-three patients who underwent the BC technique for mild and moderate hallux valgus were prospectively evaluated. Mean follow-up was 36.5 (range 23.4-59.8) months, the mean American Orthopedic Foot and Ankle Society score improved from a median of 47.4 points preoperatively to a median of 88 points postoperatively (p < .05). First MTPJ ROM did not change from preoperative period (mean 32.5°) to the postoperative period (mean 31.8°) (p > .65). All osteotomies went on to bony healing in the 6-week follow-up visit. Fifty-two (82%) of patients were either very satisfied or satisfied with the procedure (p < .05). With our numbers, BC osteotomy is shown to be a technique that can treat both mild and moderate deformities, achieving correction that is maintained over the follow-up evaluated, with a 24 relatively simple procedure and short operative time.

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Forefoot varus develops as a result of longstanding adult-acquired flatfoot deformity (AAFD). This occurs with varying degrees of deformity and flexibility. Residual forefoot varus following hindfoot realignment in AAFD can lead to lateral column loading and a persistent pronatory moment in efforts to reestablish contact between the forefoot and the ground. The Cotton osteotomy may serve as a reasonable adjunct procedure to help avoid complications and poor outcomes associated with residual forefoot varus in patients undergoing hindfoot arthrodesis for stage III AAFD. The aim of this study was to compare the radiographic outcomes in patients undergoing isolated hindfoot arthrodesis to patients undergoing hindfoot arthrodesis with adjunctive cotton osteotomy. We retrospectively reviewed 47 patients matched based upon age, sex, and comorbidities who underwent hindfoot reconstruction for the treatment of stage III AAFD between 2015 and 2019. A retrospective radiographic review was performed on standard weightbearing radiographs including anterior-posterior and lateral views preoperatively, postoperatively at the initiation of full weightbearing, and at final follow-up. Statistical analysis utilizing paired t test to calculate p values where <.05 was statistically significant. At final follow-up, radiographic measurements showed statistically significant differences in CAA, calcaneal inclination, talo-calcaneal, and talar tilt (p value <.05). The Cotton osteotomy group showed a quicker return to presurgical activity level and a decreased incident of tibiotalar valgus. Our study suggests that the Cotton osteotomy can address residual forefoot varus and potentially prevent further progression of ankle valgus in AAFD when used in combination with hindfoot arthrodesis.

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OBJECTIVE: To describe and quantify the complications arising in consecutive neuropathic patients undergoing partial longitudinal amputations of the foot. METHOD: A retrospective study was conducted with data collected from the medical records of patients monitored at the Insensitive Foot Clinic of the Foot and Ankle Group of our institution who underwent partial amputation of foot rays from 2000 to 2016. RESULTS: A total of 28 patients met the inclusion criteria, with a total of 31 amputated/partially amputated feet. Of these, 18 (58.1%) feet were amputated/partially amputated due to diabetes, seven (22.6%) due to leprosy, two (6.5%) due to alcoholic neuropathy, two (6.5%) secondary to traumatic peripheral nerve injury, and two (6.5%) due to other causes. Fifth ray amputation was the most frequent type (n=12). The cause of amputation was the presence of an infected ulcer in 93.6% of the samples. At a mean follow-up time of 60 months, 13 (41.9%) feet required new amputations-five (38.5%) transtibial, five (38.5%) transmetatarsal, two (15.4%) of the toes, and one (7.7%) at Chopart's joint. Patients with diabetes had a 50.0% reamputation rate. Patients who initially underwent amputation of the fifth ray had a 58.3% reamputation rate. CONCLUSION: Partial longitudinal amputation of the foot in neuropathic patients exhibited a high reoperation rate, especially in patients with diabetes or in patients with initial amputation of the peripheral rays. Declaration of interest: The authors have no conflicts of interest.

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Most osteochondral lesions of the first metatarsal head are likely traumatic in etiology. The treatment ranges from microfractures to mosaicplasty. In this case report, we describe a central osteochondral lesion of the first metatarsal head treated with osteochondral graft obtained from the head of the same metatarsal in combination with Moberg osteotomy. After surgical treatment, the patient's American Orthopedic Foot and Ankle Society Forefoot Scale score improved from 58 to 85, and the range of motion also improved. This technique may be an alternative treatment modality for osteochondral lesions of the first metatarsal.Level of Evidence: Level V.

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BACKGROUND: Hip motion in the transverse plane is coupled with foot motion in the frontal plane during closed kinematic activities, such as gait. Considering that movement patterns and bone alignment might influence passive mechanical properties of joints in the long term, it is possible that hip passive stiffness and foot complex stiffness and alignment are related to each other. OBJECTIVES: To investigate whether hip passive stiffness, midfoot passive stiffness and shank-forefoot alignment are related to each other. METHOD: Thirty healthy adult individuals with a mean age of 25.4 years participated (18 women and 12 men). The Foot Torsimeter was used to measure midfoot stiffness, and hip stiffness and foot alignment were measured using clinical measures. Pearson and Spearman correlation coefficients were calculated to test the associations between each pair of variables, with α = 0.05. RESULTS: Hip stiffness was positively correlated with midfoot absolute stiffness (r = 0.41, p = 0.02), indicating that increased hip stiffness is associated with increased midfoot stiffness. There were no associations between shank-forefoot alignment and the other variables. CONCLUSIONS: In clinical settings, individuals with reduced hip passive stiffness may also have reduced midfoot passive stiffness, and vice versa. Shank-forefoot alignment is not linearly associated with hip or midfoot passive stiffness.

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Juvenile xanthogranuloma is a benign histiocytic cell proliferative disorder that occurs in early childhood. The most common presentation occurs within the first 2 years of life with papular or nodular changes to the skin on the head, neck or upper trunk. This case study documents the findings and treatment of a single solitary soft tissue mass in the forefoot of a 17-year-old patient. Unique to this case, the initial diagnosis of tuberous xanthoma was made and, with referral to an outside hospital, changed to a juvenile xanthogranuloma. In addition, unlike most juvenile xanthogranulomas in the literature, there was no superficial dermatological abnormality seen clinically. This change was not a dramatically different diagnosis, but further immunohistochemical staining was necessary for ultimate diagnosis. The soft tissue mass was self-contained to the deeper tissue layers and not the epidermis. The patient was followed for 12 months for possible recurrence and medical workup, without postoperative complications. The purpose of this study was to report on a unique finding and presentation of a xanthogranulomatous soft tissue mass in the forefoot of a pediatric patient.

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Objective The present study aims to describe a new weightbearing radiographic method to visualize the heads of the five metatarsals on the coronal plane, evaluating their accuracy through intraclass correlation coefficients. Methods The subjects were evaluated, with weightbearing, with the ankle at 20 degrees of plantar flexion and the metatarsophalangeal joints at 10 degrees of extension, positioned on a wooden device. Two independent foot and ankle surgeons evaluated the radiography, with one of them doing it twice, at different moments, achieving an inter and intraobserver correlation, with intraclass correlation coefficients. Results We radiographed 63 feet, achieving an interobserver correlation coefficient of the radiographic method for the metatarsal heads heights in the coronal plane of the 1 st , 2 nd , 3 rd , 4 th , and 5 th metatarsals of, respectively, 0.90, 0.85, 0.86, 0.83, 0.89. The intraobserver correlation coefficient were, respectively, 0.95, 0.93, 0.93, 0.86, 0.92. Conclusion Those correlations demonstrate that the method is accurate and can be used to investigate metatarsal head misalignments in this plane.

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Abstract Objective The present study aims to describe a new weightbearing radiographic method to visualize the heads of the five metatarsals on the coronal plane, evaluating their accuracy through intraclass correlation coefficients. Methods The subjects were evaluated, with weightbearing, with the ankle at 20 degrees of plantar flexion and the metatarsophalangeal joints at 10 degrees of extension, positioned on a wooden device. Two independent foot and ankle surgeons evaluated the radiography, with one of them doing it twice, at different moments, achieving an inter and intraobserver correlation, with intraclass correlation coefficients. Results We radiographed 63 feet, achieving an interobserver correlation coefficient of the radiographic method for the metatarsal heads heights in the coronal plane of the 1st, 2nd, 3rd, 4th, and 5th metatarsals of, respectively, 0.90, 0.85, 0.86, 0.83, 0.89. The intraobserver correlation coefficient were, respectively, 0.95, 0.93, 0.93, 0.86, 0.92. Conclusion Those correlations demonstrate that the method is accurate and can be used to investigate metatarsal head misalignments in this plane.

Resumo Objetivo Este estudo tem como objetivo descrever um novo método radiográfico com carga fisiológica para visualizar as cabeças dos cinco metatarsos no plano coronal. Métodos Os indivíduos foram radiograficamente avaliados com carga, com o tornozelo a 20º de flexão plantar e as articulações metatarsofalângicas a 10º de extensão, posicionadas em um dispositivo de madeira. As medidas foram aferidas por dois avaliadores independentes, sendo que um deles mediu em dois momentos distintos, obtendo a correlação inter e intraobservador, com o coeficiente de correlação intraclasses. Resultados Examinamos 63 pés, obtendo um coeficiente de correlação interobservador do método radiográfico para as alturas das cabeças dos metatarsos no plano coronal do 1º, 2º, 3º, 4º e 5º metatarsos de, respectivamente, 0,90, 0,85, 0,86, 0,83, 0,89. O coeficiente de correlação intraobservador foi, respectivamente, 0,95, 0,93, 0,93, 0,86, 0,92. Conclusão Essas correlações demonstram que o método é preciso e pode ser usado para investigar os desalinhamentos de cabeça dos metatarsos nesse plano.

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OBJECTIVE: To assess the accuracy of magnetic resonance imaging (MRI) for the diagnosis of hallux valgus using radiography during weight bearing as the gold standard. MATERIALS AND METHODS: This was a retrospective analysis of all patients undergoing MRI of the foot and radiography of the foot during weight bearing at our institution between January and June of 2015. The hallux valgus angle (HVA) was measured on MRI and radiography. The Wilcoxon signed-rank test and simple linear regression were used in order to compare measurements. Patients were divided into two groups according to the HVA determined on radiography: > 15° (hallux valgus) and ≤ 15° (control). Qualitative and quantitative assessments of MRI scans were performed. For quantitative assessment, receiver operating characteristic curves were used in order to determine the HVA cutoff with the highest accuracy. RESULTS: A total of 66 MRI scans were included, 22 in the hallux valgus group and 44 in the control group. Wilcoxon signed-rank tests indicated a significant difference between the radiography and MRI measurements. Simple linear regression showed a nonlinear relationship between the measurements and values did not present a strong correlation. In comparison with the radiography measurements, MRI with an HVA cutoff of 16.4° exhibited the highest accuracy (86%). The accuracy of the subjective (qualitative) assessment was inferior to the objective assessment (measurement of the HVA). CONCLUSION: Hallux valgus can be diagnosed by measuring the HVA on MRI, satisfactory accuracy being achieved with an HVA cutoff of 16.4°.

OBJETIVO: Avaliar a acurácia da ressonância magnética (RM) para o diagnóstico de hálux valgo usando radiografias com carga como padrão ouro. MATERIAIS E MÉTODOS: Análise retrospectiva de pacientes que realizaram RM do antepé e radiografias com carga, de janeiro a junho de 2015. O ângulo metatarsofalangiano (AMF) foi medido nas RMs e nas radiografias. O teste de Wilcoxon e regressão linear foram utilizados para comparar as mensurações. Pacientes foram divididos de acordo com os valores do AMF nas radiografias: > 15° (hálux valgo) e ≤ 15° (grupo controle). Avaliações qualitativa e quantitativa foram realizadas por RM. Para análise quantitativa, uma curva ROC foi utilizada para definir o ponto de corte com maior acurácia. RESULTADOS: Foram incluídas 66 RMs, 22 no grupo com hálux valgo e 44 no grupo controle. O teste de Wilcoxon indicou diferença significativa entre os métodos. Avaliação de regressão demonstrou relação não linear entre as medidas e e os valores não apresentaram boa correlação. Considerando os grupos hálux valgo e controle, um valor de corte 16,4° na RM demonstrou maior acurácia (86%). A avaliação subjetiva foi inferior à avaliação objetiva. CONCLUSÃO: A medida do AMF na RM pode ser utilizada para diagnóstico de hálux valgo, com um valor de corte de 16,4°.

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Abstract Objective: To assess the accuracy of magnetic resonance imaging (MRI) for the diagnosis of hallux valgus using radiography during weight bearing as the gold standard. Materials and Methods: This was a retrospective analysis of all patients undergoing MRI of the foot and radiography of the foot during weight bearing at our institution between January and June of 2015. The hallux valgus angle (HVA) was measured on MRI and radiography. The Wilcoxon signed-rank test and simple linear regression were used in order to compare measurements. Patients were divided into two groups according to the HVA determined on radiography: > 15° (hallux valgus) and ≤ 15° (control). Qualitative and quantitative assessments of MRI scans were performed. For quantitative assessment, receiver operating characteristic curves were used in order to determine the HVA cutoff with the highest accuracy. Results: A total of 66 MRI scans were included, 22 in the hallux valgus group and 44 in the control group. Wilcoxon signed-rank tests indicated a significant difference between the radiography and MRI measurements. Simple linear regression showed a nonlinear relationship between the measurements and values did not present a strong correlation. In comparison with the radiography measurements, MRI with an HVA cutoff of 16.4° exhibited the highest accuracy (86%). The accuracy of the subjective (qualitative) assessment was inferior to the objective assessment (measurement of the HVA). Conclusion: Hallux valgus can be diagnosed by measuring the HVA on MRI, satisfactory accuracy being achieved with an HVA cutoff of 16.4°.

Resumo Objetivo: Avaliar a acurácia da ressonância magnética (RM) para o diagnóstico de hálux valgo usando radiografias com carga como padrão ouro. Materiais e Métodos: Análise retrospectiva de pacientes que realizaram RM do antepé e radiografias com carga, de janeiro a junho de 2015. O ângulo metatarsofalangiano (AMF) foi medido nas RMs e nas radiografias. O teste de Wilcoxon e regressão linear foram utilizados para comparar as mensurações. Pacientes foram divididos de acordo com os valores do AMF nas radiografias: > 15° (hálux valgo) e ≤ 15° (grupo controle). Avaliações qualitativa e quantitativa foram realizadas por RM. Para análise quantitativa, uma curva ROC foi utilizada para definir o ponto de corte com maior acurácia. Resultados: Foram incluídas 66 RMs, 22 no grupo com hálux valgo e 44 no grupo controle. O teste de Wilcoxon indicou diferença significativa entre os métodos. Avaliação de regressão demonstrou relação não linear entre as medidas e e os valores não apresentaram boa correlação. Considerando os grupos hálux valgo e controle, um valor de corte 16,4° na RM demonstrou maior acurácia (86%). A avaliação subjetiva foi inferior à avaliação objetiva. Conclusão: A medida do AMF na RM pode ser utilizada para diagnóstico de hálux valgo, com um valor de corte de 16,4°.

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BACKGROUND: The clinical measure of forefoot-shank alignment (FSA) predicts the amount of foot pronation during weight-bearing tasks. This may be mediated by a relationship between FSA and the mechanical resistance of the midfoot joint complex (MFJC) to forefoot inversion, which is a component of weight-bearing foot pronation. OBJECTIVE: To investigate if the clinical measure of FSA is associated with MFJC mechanical resistance to inversion. DESIGN: Cross-sectional observational study. METHOD: Forty-six healthy individuals (27 males; 19 females) with mean age of 26.4 years (SD 5.3) participated in this study. FSA was measured with photographs. The resistance torque of the MFJC against inversion was measured with a specially designed device. Mean torque, mean torque normalized by body mass, and joint resting position were calculated as variables related to MFJC mechanical resistance. Correlation analyses were carried out to test the association between each MFJC resistance variable and the FSA (α = 0.05). RESULTS: /findings: There were significant moderate correlations of FSA with mean torque (r = -0.44, p = 0.002), mean normalized torque (r = -0.42, p = 0.004) and resting position (r = 0.39, p = 0.007). The clinical measure of FSA is associated to the mechanical resistance of the MFJC: (a) the greater the FSA, the smaller the resistance torques; (b) the greater the FSA, the more inverted the forefoot resting position. CONCLUSIONS: These results showed that the clinical measure of FSA is moderately related to mechanical properties of the MFJC.

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The present study aimed to use a Support Vector Machine (SVM) algorithm to identify and classify shod and barefoot running as well as rearfoot and forefoot landings. Ten habitually shod runners ran at self-selected speed. Thigh and leg muscle surface electromyography (EMG) were recorded. Discrete Wavelet transformation (DWT) and Fast Fourier transformation (FFT) were used for the assembly of vectors for training and classification of a SVM. Using the FFT coefficients for the gastrocnemius and tibialis anterior muscles presented the best results for differentiating between rearfoot/forefoot running in the window before foot-floor contact possibly due to these muscles' critical role in determining which part of the foot will first touch the floor. The classification rate was 76% and 67% respectively, with a probability of being random of 0.5% and 4% respectively. For the same terms and conditions of classification, the DWT produced a reduction in the percentage of correctness of 60% and 53% with a probability of having reached these levels randomly of 15% and 35%. In conclusion, based on EMG signals, the use a FFT to train a SVM was a better option to differentiate running forefoot/rearfoot than to use the DWT. Shod/barefoot running could not be differentiated.

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Although hallux abductovalgus (HAV) is widely considered to be a triplanar deformity involving the transverse, sagittal, and frontal planes, most of the published literature has focused on evaluating the deformity in only the transverse plane, and we are unaware of any investigation objectively evaluating the relationship among the 3 planes in the setting of HAV deformity. The objective of this investigation was to quantitatively evaluate radiographic measurement of the relationship between the transverse, sagittal, and frontal planes in the HAV deformity. Anteroposterior, lateral, and sesamoid axial radiographs from 42 consecutive feet were evaluated with measurement of the first intermetatarsal angle, hallux abductus angle, metatarsal sesamoid position, first metatarsal inclination angle, sesamoid rotation angle, and tibial sesamoid grade. Variables were graphically depicted against each other on frequency scatter plots with calculation of a regression line and Pearson's correlation coefficient. As transverse plane deformity increased, the frontal plane deformity also tended to increase and the first metatarsal inclination angle tended to decrease. And as frontal plane deformity increased, the first metatarsal inclination angle tended to decrease. To our knowledge, these are the first quantitative and objective data in support of a triplanar component to the HAV deformity, and we believe this reinforces the evaluation of this deformity with emphasis on all 3 planes.

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RESUMO

Brachymetatarsia (shortening of the metatarsal) directly affects the transversal arch of the foot causing severe deformities, such as hallux valgus, divergent toes, overlapping toes, metatarsalgia, all of these alter the biomechanics of the foot and gait. Treatment consists of two main techniques, one-stage lengthening with bone graft or elongation through callotaxis with external fixator; there are variants of both techniques used to minimize the disadvantages of each. The objective of treatment must be to return the structural harmony to the forefoot, improving the biomechanics, resulting in a satisfactory outcome for the patients. This article presents a surgical treatment for feet with closed physis to obtain the appropriate metatarsal formula and to reestablish aesthetics and function. This case was treated by means of one-stage lengthening with bone graft to the affected metatarsal; shortening of the adjacent metatarsals; hallux valgus alignment through the necessary osteotomies and the treatment of deformities of the lesser toes as needed. This surgical technique has as one of its advantages the correction of the entire forefoot at one time, without the need of an external fixator and its required postoperative care. Its main disadvantages are its dependence on structural bone graft and the need of postoperative dressing until healing of the bone has taken place. Satisfactory clinical and radiographical outcomes were obtained in treated patient.

La braquimetatarsia (acortamiento metatarsal) afecta directamente el arco transverso del pie condicionando graves deformidades como hallux valgus, divergencia digital, dedo supraaducto, metatarsalgia, todas estas alteran la biomecánica del pie y la marcha. El tratamiento se realiza mediante dos técnicas principales, elongación en un solo tiempo quirúrgico con interposición de injerto óseo o elongación por callotaxis con minifijador externo. Existen variantes de ambas técnicas con la finalidad de disminuir las desventajas de cada una de ellas. El objetivo del tratamiento debe ser devolver la armonía estructural del antepié, con lo que mejora la biomecánica, traduciéndose en una evolución satisfactoria para los pacientes. En este artículo se presenta una técnica quirúrgica para pies con fisis cerradas que busca la reestructuración de la fórmula metatarsal y el restablecimiento de la estética y función. En el caso reportado se efectuó alargamiento en un solo tiempo del metatarsiano afectado con interposición de injerto óseo, acortamiento a los metatarsianos adyacentes, corrección del hallux valgus realizando las osteotomías necesarias y el tratamiento de las deformidades de los dedos menores con los métodos requeridos para cada caso. Esta técnica quirúrgica tiene como ventaja la corrección de todo el antepié en un solo tiempo quirúrgico sin necesidad de fijador externo ni de sus cuidados postoperatorios. Sus principales desventajas son la dependencia del injerto óseo estructural y la necesidad de vendaje funcional postquirúrgico hasta la consolidación ósea. En la paciente tratada se obtuvieron resultados clínicos y radiográficos satisfactorios.

Assuntos

RESUMO

Resumen: La braquimetatarsia (acortamiento metatarsal) afecta directamente el arco transverso del pie condicionando graves deformidades como hallux valgus, divergencia digital, dedo supraaducto, metatarsalgia, todas estas alteran la biomecánica del pie y la marcha. El tratamiento se realiza mediante dos técnicas principales, elongación en un solo tiempo quirúrgico con interposición de injerto óseo o elongación por callotaxis con minifijador externo. Existen variantes de ambas técnicas con la finalidad de disminuir las desventajas de cada una de ellas. El objetivo del tratamiento debe ser devolver la armonía estructural del antepié, con lo que mejora la biomecánica, traduciéndose en una evolución satisfactoria para los pacientes. En este artículo se presenta una técnica quirúrgica para pies con fisis cerradas que busca la reestructuración de la fórmula metatarsal y el restablecimiento de la estética y función. En el caso reportado se efectuó alargamiento en un solo tiempo del metatarsiano afectado con interposición de injerto óseo, acortamiento a los metatarsianos adyacentes, corrección del hallux valgus realizando las osteotomías necesarias y el tratamiento de las deformidades de los dedos menores con los métodos requeridos para cada caso. Esta técnica quirúrgica tiene como ventaja la corrección de todo el antepié en un solo tiempo quirúrgico sin necesidad de fijador externo ni de sus cuidados postoperatorios. Sus principales desventajas son la dependencia del injerto óseo estructural y la necesidad de vendaje funcional postquirúrgico hasta la consolidación ósea. En la paciente tratada se obtuvieron resultados clínicos y radiográficos satisfactorios.

Abstract: Brachymetatarsia (shortening of the metatarsal) directly affects the transversal arch of the foot causing severe deformities, such as hallux valgus, divergent toes, overlapping toes, metatarsalgia, all of these alter the biomechanics of the foot and gait. Treatment consists of two main techniques, one-stage lengthening with bone graft or elongation through callotaxis with external fixator; there are variants of both techniques used to minimize the disadvantages of each. The objective of treatment must be to return the structural harmony to the forefoot, improving the biomechanics, resulting in a satisfactory outcome for the patients. This article presents a surgical treatment for feet with closed physis to obtain the appropriate metatarsal formula and to reestablish aesthetics and function. This case was treated by means of one-stage lengthening with bone graft to the affected metatarsal; shortening of the adjacent metatarsals; hallux valgus alignment through the necessary osteotomies and the treatment of deformities of the lesser toes as needed. This surgical technique has as one of its advantages the correction of the entire forefoot at one time, without the need of an external fixator and its required postoperative care. Its main disadvantages are its dependence on structural bone graft and the need of postoperative dressing until healing of the bone has taken place. Satisfactory clinical and radiographical outcomes were obtained in treated patient.

Assuntos