In vivo absolute quantification of carnosine in the vastus lateralis muscle with 1H MRS using a surface coil and water as internal reference.

OBJECTIVE: To standardize a method for 1H MRS intramuscular absolute quantification of carnosine in the thigh, using a surface coil and water as internal reference. MATERIALS AND METHODS: Carnosine spectra were acquired in phantoms (5, 10, and 15 mM) as well as in the right gastrocnemius medialis (GM) and right vastus lateralis (VLM) muscles of young team sports athletes, using volume (VC) and surface (SC) coils on a 3 T scanner, with the same receiver gain. Water spectra were used as internal reference for the absolute quantification of carnosine. RESULTS: Phantom's experiments showed a maximum error of 7%, highlighting the validity of the measurements in the study setup. The carnosine concentrations (mmol/kg ww, mean ± SD) measured in the GM were 6.8 ± 2.2 with the VC (CcarVC) and 10.2 ± 3.0 with the SC (CcarSC) (P = 0.013; n = 9). Therefore, a correction was applied to these measurements (CcarVC = 0.6582*CcarSC), to make coils performance comparable (6.8 ± 2.2 for VC and 6.7 ± 2.0 for SC, P = 0.97). After that, only the SC was used to quantify carnosine in the VLM, where a concentration of 5.4 ± 1.5 (n = 30) was found, with significant differences between men (6.2 ± 1.3; n = 15) and women (4.6 ± 1.2; n = 15). The error in quantitation was 5.3-5.5% with both coils. CONCLUSION: The method using the SC and water as internal reference can be used to quantify carnosine in voluminous muscles and regions of the body in humans, where the VC is not suitable, such as the VLM.

Efficacy of high-intensity interval- or continuous aerobic-training on insulin resistance and muscle function in adults with metabolic syndrome: a clinical trial.

PURPOSE: We carried out a randomized, clinical trial in adults of both sexes with metabolic syndrome (MS) to assess the efficacy of high-intensity, low-volume interval training (HIIT) compared to moderate-intensity continuous training (MICT) on insulin resistance (IR), muscle mass, muscle activation, and serum musclin. METHODS: Fasting glycemia, insulinemia, and glycated haemoglobin were determined by conventional methods, IR by Homeostatic model assessment (HOMA), lean mass by Dual-Energy X-ray Absorptiometry, muscle activation through carnosine by Proton Magnetic Resonance Spectroscopy, and musclin by Enzyme-Linked ImmunoSorbent Assay before and after a supervised, three-times/week, 12-week treadmill programme. HIIT (n = 29) consisted of six intervals with one-minute, high-intensity phases at 90% of peak oxygen consumption (VO2peak). MICT (n = 31) trained at 60% of VO2peak for 30 min. RESULTS: Patients had a mean age of 50.8 ± 6.0 years, body mass index of 30.6 ± 4.0 kg/m2, and VO2peak of 29.0 ± 6.3 mL.kg-1.min-1. Compared to MICT, HIIT was not superior at reducing Ln HOMA-IR (adjusted mean difference: 0.083 [95%CI - 0.092 to 0.257]), carnosine or musclin or at increasing thigh lean mass. HIIT increased carnosine by 0.66 mmol/kg.ww (95% CI 0.08-1.24) after intervention. Both interventions reduced IR, body fat percentage and increased total lean mass/height2 and VO2peak. Musclin showed a non-significant reduction with a small effect size after both interventions. CONCLUSION: Compared to MICT, HIIT is not superior at reducing IR, carnosine or musclin or at increasing skeletal muscle mass in adults with MS. Both training types improved IR, muscle mass and body composition. NCT03087721, March 22nd, 2017. TRIAL REGISTRATION NUMBER: NCT03087721. Registered March 22nd, 2017.

Medición de la pérdida ósea glenoidea y defecto de Hill-Sachs por resonancia magnética: estudio de correlación y concordancia con la medición por tomografía computarizada / Measurement of glenoid bone loss and Hill­Sachs defect by magnetic resonance imaging: Correlation and concordance study with computed tomography measurement

Introducción Se pretende definir si la medición de los defectos glenoideos y de Hills-Sachs por resonancia magnética es equivalente a la medición a través de tomografía simple en pacientes con inestabilidad anterior de hombro. Materiales y métodos Estudio observacional descriptivo, tipo transversal de una cohorte de estudios de imagenología de pacientes con antecedente de luxación anterior de hombro, los cuales comprenden resonancia magnética y tomografías simples de hombro, realizadas en un hospital de cuarto nivel. Resultados La cohorte estuvo conformada por 20 casos; se encontró una alta correlación y estadísticamente significativa para la medición del diámetro y defecto glenoideo, con una p<0.05 entre la resonancia y la tomografía simple. Además, se encontró con significancia estadística la medición del intervalo del Hill-Sachs, pero el índice de correlación no fue alto, 60%. Para la concordancia intraobservador, se calculó un índice Kappa para la resonancia magnética de 0.8 comparado con la tomografía con valor de p <0.05 significativo para los defectos enganchantes y no enganchantes. Conclusión La resonancia magnética simple es un método de imagen confiable con alto índice de correlación para la medición del diámetro y los defectos glenoideos con buena concordancia para establecer si los defectos de Hill-Sachs son enganchantes o no.

Introduction The aim is to define whether the measurement of glenoid and Hill­Sachs defects by magnetic resonance imaging is equivalent to the measurement by simple tomography in patients with anterior shoulder instability. Materials and methods Descriptive, observational, cross-sectional study of a cohort of imaging studies of patients with a history of anterior shoulder dislocation, comprising magnetic resonance and simple tomography of the shoulder, performed in a fourth level hospital. Results The cohort consisted of 20 cases; a high and statistically significant correlation was found for the measurement of the glenoid diameter and defect, with a p<0.05 between the MRI and simple tomography. In addition, the Hill­Sachs interval measurement was found to be statistically significant, but the correlation index was not high, 60%. For intraobserver agreement, a Kappa index was calculated for MRI of 0.8 compared to CT with p-value <0.05 significant for engaging and non-engaging defects. Conclusion Simple MRI is a reliable imaging method with high correlation index for the measurement of diameter and glenoid defects with good agreement to establish whether Hill­Sachs defects are engaging or not.

Musclin Is Related to Insulin Resistance and Body Composition, but Not to Body Mass Index or Cardiorespiratory Capacity in Adults.

BACKGROUND: We studied whether musclin function in humans is related to glycemic control, body composition, and cardiorespiratory capacity. METHODS: A cross-sectional study was performed in sedentary adults with or without metabolic syndrome (MS). Serum musclin was measured by enzyme-linked immunosorbent assay. Insulin resistance (IR) was evaluated by the homeostatic model assessment (HOMA-IR). Body composition was determined by dual-energy X-ray absorptiometry and muscle composition by measuring carnosine in the thigh, a surrogate of fiber types, through proton magnetic resonance spectroscopy. Cardiorespiratory capacity was assessed through direct ergospirometry. RESULTS: The control (n=29) and MS (n=61) groups were comparable in age (51.5±6.5 years old vs. 50.7±6.1 years old), sex (72.4% vs. 70.5% women), total lean mass (58.5%±7.4% vs. 57.3%±6.8%), and peak oxygen consumption (VO2peak) (31.0±5.8 mL O2./kg.min vs. 29.2±6.3 mL O2/kg.min). Individuals with MS had higher body mass index (BMI) (30.6±4.0 kg/m2 vs. 27.4± 3.6 kg/m2), HOMA-IR (3.5 [95% confidence interval, CI, 2.9 to 4.6] vs. 1.7 [95% CI, 1.1 to 2.0]), and musclin (206.7 pg/mL [95% CI, 122.7 to 387.8] vs. 111.1 pg/mL [95% CI, 63.2 to 218.5]) values than controls (P˂0.05). Musclin showed a significant relationship with HOMA-IR (ß=0.23; 95% CI, 0.12 to 0.33; P˂0.01), but not with VO2peak, in multiple linear regression models adjusted for age, sex, fat mass, lean mass, and physical activity. Musclin was significantly associated with insulin, glycemia, visceral fat, and regional muscle mass, but not with BMI, VCO2peak, maximum heart rate, maximum time of work, or carnosine. CONCLUSION: In humans, musclin positively correlates with insulinemia, IR, and a body composition profile with high visceral adiposity and lean mass, but low body fat percentage. Musclin is not related to BMI or cardiorespiratory capacity.

Utilidad de las secuencias funcionales por resonancia magnética en el estudio de los tumores óseos y de partes blandas. Revisión imaginológica / Difusion and Functional Sequences: Utility in the Study of Bone and Soft Tissue Tumors. Pictorial Review

La resonancia magnética es la técnica de imagen de elección para diagnosticar, caracterizar, estadificar, realizar el seguimiento y valorar la respuesta al tratamiento de los tumores musculoesqueléticos. Para estos fines se utilizan las secuencias convencionales. Desde hace algunos años se han comenzado a implementar nuevas técnicas avanzadas, como la secuencia en fase y fase opuesta, difusión, perfusión y espectroscopia, que en conjunto se denominan técnicas funcionales, las cuales proporcionan información más específica del comportamiento, fisiología, metabolismo y biología molecular del tumor. Estas secuencias son no invasivas, aportan información adicional cualitativa, cuantitativa, metabólica y vascular por lo que deberían utilizarse de manera rutinaria en el momento de realizar el diagnóstico y, especialmente, en el seguimiento de los tumores óseos y de partes blandas. En este artículo se revisa la técnica de dichas secuencias, particularmente la secuencia de difusión, mediante casos ilustrativos de nuestros hospitales: Hospital Pablo Tobón Uribe y Hospital Universitario Quirón Salud de Madrid. También se revisarán las aplicaciones e importancia de un análisis combinado de estas nuevas herramientas, que aportarán información adicional para adecuada caracterización, enfoque diagnóstico y respuesta al tratamiento de las lesiones tumorales en el sistema musculoesquelético

Magnetic resonance imaging (MR) is the preferred technique for the diagnosis, characterization, staging, follow-up and assessment of response to treatment of musculoskeletal tumors. Conventional sequences help to classify these lesions. Recently new evolving functional MR sequences with advanced techniques have been implemented, such as phase sequence, opposite phase, diffusion, perfusion and spectroscopy, which provide specific information about the behavior, physiology, metabolism and molecular biology of the tumor. These sequences are non-invasive and provide additional qualitative, quantitative, metabolic and vascular information, making them important for the diagnosis and monitoring of bone and soft tissue tumors. This article reviews the technique of these sequences, particualrly the diffusion technique, using illustrative cases from the Hospital Pablo Tobon Uribe (Medellin ­ Colombia) and the University Hospital Quirón Salud (Madrid ­ Spain). We aim to review the utility and importance of a combined analysis of these new tools, which will provide additional information for adequate characterization, diagnosis and response to treatment of tumor lesions in the musculoskeletal system.

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance.

Muscle is an important component of the muscle-tendon-bone unit, driving skeletal motion through contractions that alter the length of the muscle. The muscle and myotendinous junction (MTJ) are most commonly injured in the young adult, as a result of indirect mechanisms such as overuse or stretching, direct impact (penetrating or nonpenetrating), or dysfunction of the supporting connective tissues. Magnetic resonance (MR) imaging is widely used for assessment of muscle injuries. This review illustrates the MR imaging appearance of a broad spectrum of acute, subacute, and chronic traumatic lesions of muscle, highlighting the pathophysiology, biomechanics, and anatomic considerations underlying these lesions. Concentric (shortening) contractions are more powerful, but it is eccentric (lengthening) contractions that produce the greatest muscle tension, leading to indirect injuries such as delayed-onset muscle soreness (DOMS) and muscle strain. Strain is the most commonly encountered muscle injury and is characteristically located at the MTJ, where maximal stress accumulates during eccentric exercise. The risk of strain varies among muscles based on their fiber composition, size, length, and architecture, with pennate muscles being at highest risk. Direct impact to muscle results in laceration or contusion, often accompanied by intramuscular interstitial hemorrhage and hematoma. Disorders related to the muscle's collagen framework include compartment syndrome, which is related to acute or episodic increases in pressure, and muscle herniation through anatomic defects in the overlying fascia. The healing response after muscle trauma can result in regeneration, degeneration with fibrosis and fatty replacement, or disordered tissue proliferation as seen in myositis ossificans. In athletes, accurate grading of the severity and precise location of injury is necessary to guide rehabilitation planning to prevent reinjury and ensure adequate healing. In elite athletes, MR imaging grading of muscle trauma plays an increasingly important role in recently developed comprehensive grading systems that are replacing the imprecise three-grade injury classification system currently used. ©RSNA, 2017.

Giba carpiana, una patología frecuente / Carpal Boss a Frequent Pathology

Carpal boss o giba carpiana es una patología que se ha descrito desde hace más de 200 años; no obstante, a pesar de ser una entidad reconocida por mucho tiempo, su incidencia es desconocida y no se ha podido establecer su etiología. Se han propuesto varias teorías al respecto, como el proceso degenerativo de la articulación carpo-metacarpiana, o periostitis en la inserción del tendón del músculo extensor carpi radialis longus secundaria a trauma repetitivo, entre otros. Clínicamente, el paciente puede ser asintomático y el hallazgo puede resultar incidental; o puede ser sintomático, siendo el dolor el síntoma más común. En el examen físico, el médico puede sentir un abultamiento en la parte dorsal de la mano, que es más común en la mano dominante. Las imágenes ayudan a saber si el abultamiento es una lesión intra- o extra-ósea y, para tal efecto, se pueden utilizar radiografías, tomografía computarizada (TC) y resonancia magnética (RM). El ultrasonido es útil para ayudar en el diagnóstico diferencial. Algunos de los diagnósticos diferenciales tienen origen benigno, como el ganglión o el lipoma, pero también hay tumores y entidades pseudotumorales, como el tumor de células gigantes. El tratamiento puede ser médico o quirúrgico.

Carpal boss is a pathology that has been described for more than 200 years; nevertheless, despite being a condition recognized for a long time, its incidence and etiology are unknown. Several theories have been proposed, including degeneration of the carpometacarpal joint, and periostitis at the insertion of the tendon of extensor carpi radialis longus secondary to repetitive trauma, among others. Clinically, the patient may be asymptomatic and the finding may be incidental; or he/she may be symptomatic, pain being the most common symptom. On physical examination, the doctor may feel a lump on the back of the hand, which is more common in the dominant hand. Images help to clarify whether the lump is an intra- or extra-osseous lesion; for this purpose, radiography, CT and MR imaging can be used. Ultrasound is useful to aid differential diagnosis. Some of the differential diagnoses has benign origin, such as ganglion cyst or lipoma, but there are also tumors and tumor-like entities, such as giant cell tumor. Treatment may be medical or surgical.

Polimialgia reumática: Presentación de caso / Polymialgia Rheumatica: a Case Report

La polimialgia reumática es una enfermedad que generalmente afecta a los individuos mayores de 50 años. Desde 1963 se ha modificado su denominación y clasificación; en la actualidad, para su diagnóstico se cuentan con criterios clínicos e imagenológicos. Entre los criterios imagenológicos se considera especialmente el ultrasonido; sin embargo, la resonancia magnética permite descartar diagnósticos diferenciales y considerar en forma oportuna el diagnóstico de la polimialgia reumática. Esto se destaca en el presente artículo que describe el caso de una paciente de 56 años con antecedentes de perioniquia secundaria a pedicura y, como complicación, una espondilodiscitis. Posteriormente aparece dolor articular simétrico, matutino, en caderas y hombros; por medio de resonancia magnética se establece el diagnóstico del proceso infeccioso inicial y se descarta el compromiso infeccioso articular, lo cual se asocia a criterios clínicos y se diagnostica y trata la polimialgia reumática.

Polymyalgia rheumatica is a disease that usually affects people over 50 years old. Since 1963, its name and classification have been modified; at present, there are clinical and imaging data criteria for its diagnosis. Among the imaging criteria, ultrasound plays a pivotal role; however, magnetic resonance helps to rule out different diagnoses, as well as to clarify the diagnosis of polymyalgia rheumatica. This paper highlights this fact by presenting the case of a 56-year old female patient with a history of paronychia secondary to pedicure, and spondylodiscitis as a complication. Later, she reports symmetrical joint pain in hips and shoulders in the morning; magnetic resonance is used to establish the initial infective process, while infective joint involvement is discarded; it is associated with clinical criteria in order to establish the diagnosis and treatment of polymyalgia rheumatic.

Fractura femoral subtrocantérica atípica relacionada con el consumo de bifosfonatos: Presentación de caso / Atypical Subtrochanteric Fracture in Association with Bisphosphonate Treatment: Case Report

Los bifosfonatos son el tratamiento de elección en condiciones caracterizadas por el incremento en la resorción ósea, como la osteoporosis y otras enfermedades con alto riesgo de fracturas. Paradójicamente, ha sido descrita la asociación de estos medicamentos con fracturas por insuficiencia atípicas femorales. Este fenómeno es desconocido por gran parte de los médicos clínicos y radiólogos, por lo cual la verdadera incidencia de esta patología está subvalorada. Es característica su localización subtrocantérica o en la diáfisis femoral y su aparición en un contexto de mínimo o ningún trauma. Comienzan como una línea de fractura transversa, que compromete la cortical lateral y se extiende progresivamente hacia medial, lo cual conlleva un alto riesgo para la progresión hacia una fractura completa. Es de gran importancia el conocimiento de la relación causal entre los bifosfonatos y este tipo de fracturas y, en particular, de sus hallazgos radiológicos típicos; de esta forma se lograría realizar un diagnóstico temprano que daría lugar a un tratamiento óptimo. En este artículo se presenta el caso de una mujer de 70 años con antecedente de cáncer de mama y osteoporosis, en tratamiento con bifosfonatos, a quien se le diagnostica una fractura mediante estudios por diferentes modalidades de imagen y con confirmación histopatológica.

Bisphosphonates are the treatment of choice in conditions characterized by an increase in bone reabsorption such as osteoporosis and other diseases that have a high risk of fractures. Paradoxically, the association of these pharmacological agents has been described with atypical femoral insufficiency fractures. This phenomenon is largely unknown to clinicians and radiologists, so the true incidence of this disease is underestimated. The location in the subtrochanteric region or femoral shaft is characteristic as is its appearance in the context of minimal or no trauma. They begin as a transverse fracture line, which involves the lateral cortex and gradually extends medially; determining a high risk for progression to a complete fracture. It is very important to understand the causal relationship between bisphosphonates and these fractures, especially its typical radiological findings, so an early diagnosis can be made leading to optimal treatment. The case of a 70-year-old woman with history of breast cancer and osteoporosis is discussed in the article. She is treated with bisphosphonates, her fracture is diagnosed by different imaging modalities studies and subsequent histopathological confirmation.

Sarcoma de Ewing de escápula: Presentación de casoc / Ewing Sarcoma: Case Report

El sarcoma de Ewing representa el segundo tumor primario de hueso más común en niños y adolescentes (3 % de todos los tumores óseos pediátricos), solo excedido en prevalencia por el osteosarcoma. Respecto al sitio de compromiso, el sarcoma de Ewing afecta la pelvis, las extremidades y las costillas en el 86 % de los casos, seguido por la escápula (de 4 a 5 %). Este artículo presenta un caso de sarcoma de Ewing en la escápula; se describen sus características clínicas e imaginológicas, así como su tratamiento.

Ewing´s sarcoma is the second most common primary bone tumor in children and adolescents (3% of all pediatric bone tumors), its prevalence is only exceeded by osteosarcoma. Regarding the site of involvement, Ewing's sarcoma involves pelvis, limbs and the ribs in 86% of cases, followed by the scapula (4-5%). This article presents a case of Ewing's sarcoma in the scapula; clinical and imaging characteristics are described, as well as treatment.

Intra- and interobserver agreement on the Oestern and Tscherne classification of soft tissue injury in periarticular lower-limb closed fractures / Concordancia intra e interobservador de la clasificación de Oestern y Tscherne para lesiones de tejidos blandos en fracturas cerradas periarticulares del miembro inferior

Background: The soft tissues injury in periarticular fractures of the lower extremities determines the proper time to perform bone fixation. Objective: The aim of this study was to determine the intra and interobserver agreement in the Tscherne classification. Methods: This is a descriptive, prospective study for patients admitted to the Pablo Tobón Uribe Hospital (PTUH) with tibial plateau or tibial pilon fractures. We performed a standardize evaluation using video photography at the time of admission and 24, 48, and 72 h after admission. Fifteen five reviewers who had various levels of training produced a total of 1,200 observations. The intra- and interobserver agreement was assessed using a weighted kappa for multiple raters and more than two categories. Results: Twenty patients were admitted with tibial plateau and tibial pilon fractures. The intraobserver agreement for all 15 raters was kappa 0.81 (95% CI 0.79-0.83), and the interobserver agreement for all 15 raters was kappa 0.65 (95% CI 0.55-0.73). The interobserver agreement at 24 h was kappa 0.67 (95% CI 0.46-0.86). Conclusions: Classifying the severity of soft tissue injury is critical in planning the surgical management of fractures of the lower extremities. Based on our results, we can reasonably argue that the Tscherne classification produced an adequate level of agreement and could be used to standardize and to guide the treatment, and to conduct research studies.

Antecedentes: La lesión de los tejidos blandos en fracturas periarticulares del miembro inferior determina el momento adecuado para realizar la fijación ósea. Objetivo: El propósito de este estudio fue determinar la concordancia intra e interobservador para la clasificación de Tscherne. Métodos: Estudio descriptivo, prospectivo en pacientes ingresados al Hospital Pablo Tobón Uribe con fracturas de platillos tibiales o pilón tibial. Se realizó una evaluación estandarizada utilizando videos y fotografías al momento del ingreso y 24, 48 y 72 h después. Quince evaluadores que tenían diferentes niveles de entrenamiento produjeron 1200 observaciones. La concordancia intre e interobservador fue evaluada utilizando kappa ponderado para múltiples evaluadores y más de dos categorías. Resultados: Veinte pacientes fueron admitidos con fracturas de los platillos o del pilón tibial. La concordancia intraobservador para los 15 evaluadores fue kappa 0.81 (95% IC 0.79-0.83), y la concordancia interobservador para los 15 evaluadores fue kappa 0.65 (95% IC 0.55-0.73). La concordancia interobservador a las 24 h del ingreso fue kappa 0.67 (95% IC 0.46-0.86). Conclusión: Clasificar la gravedad de la lesión de los tejidos blandos es un paso fundamental en la planeación del manejo quirúrgico de las fracturas periarticulares del miembro inferior, con base en nuestros resultados podemos afirmar razonablemente que la clasificación de Oestern y Tscherne tiene un nivel de concordancia adecuado y podría utilizarse de forma sistemática para estandarizar la evaluación entre los ortopedistas para orientar el tratamiento y también con fines investigativos.

Intra- and interobserver agreement on the Oestern and Tscherne classification of soft tissue injury in periarticular lower-limb closed fractures.

BACKGROUND: The soft tissues injury in periarticular fractures of the lower extremities determines the proper time to perform bone fixation. OBJECTIVE: The aim of this study was to determine the intra and interobserver agreement in the Tscherne classification. METHODS: This is a descriptive, prospective study for patients admitted to the Pablo Tobón Uribe Hospital (PTUH) with tibial plateau or tibial pilon fractures. We performed a standardize evaluation using video photography at the time of admission and 24, 48, and 72 h after admission. Fifteen five reviewers who had various levels of training produced a total of 1,200 observations. The intra- and interobserver agreement was assessed using a weighted kappa for multiple raters and more than two categories. RESULTS: Twenty patients were admitted with tibial plateau and tibial pilon fractures. The intraobserver agreement for all 15 raters was kappa 0.81 (95% CI 0.79-0.83), and the interobserver agreement for all 15 raters was kappa 0.65 (95% CI 0.55-0.73). The interobserver agreement at 24 h was kappa 0.67 (95% CI 0.46-0.86). CONCLUSIONS: Classifying the severity of soft tissue injury is critical in planning the surgical management of fractures of the lower extremities. Based on our results, we can reasonably argue that the Tscherne classification produced an adequate level of agreement and could be used to standardize and to guide the treatment, and to conduct research studies.

ANTECEDENTES: La lesión de los tejidos blandos en fracturas periarticulares del miembro inferior determina el momento adecuado para realizar la fijación ósea. OBJETIVO: El propósito de este estudio fue determinar la concordancia intra e interobservador para la clasificación de Tscherne. MÉTODOS: Estudio descriptivo, prospectivo en pacientes ingresados al Hospital Pablo Tobón Uribe con fracturas de platillos tibiales o pilón tibial. Se realizó una evaluación estandarizada utilizando videos y fotografías al momento del ingreso y 24, 48 y 72 h después. Quince evaluadores que tenían diferentes niveles de entrenamiento produjeron 1200 observaciones. La concordancia intre e interobservador fue evaluada utilizando kappa ponderado para múltiples evaluadores y más de dos categorías. RESULTADOS: Veinte pacientes fueron admitidos con fracturas de los platillos o del pilón tibial. La concordancia intraobservador para los 15 evaluadores fue kappa 0.81 (95% IC 0.79-0.83), y la concordancia interobservador para los 15 evaluadores fue kappa 0.65 (95% IC 0.55-0.73). La concordancia interobservador a las 24 h del ingreso fue kappa 0.67 (95% IC 0.46-0.86). CONCLUSIÓN: Clasificar la gravedad de la lesión de los tejidos blandos es un paso fundamental en la planeación del manejo quirúrgico de las fracturas periarticulares del miembro inferior, con base en nuestros resultados podemos afirmar razonablemente que la clasificación de Oestern y Tscherne tiene un nivel de concordancia adecuado y podría utilizarse de forma sistemática para estandarizar la evaluación entre los ortopedistas para orientar el tratamiento y también con fines investigativos.