Antecedentes: el dolor lumbar (DL) y el esguince de tobillo son lesiones muy prevalentes en los bailarines de ballet. Diferentes estudios relacionan ambas lesiones, por lo que se sugiere realizar una investigación al respecto. Objetivo: determinar si existe asociación entre el esguince de tobillo y la presencia de DL en bailarines de ballet mayores de 18 años en el último año. Diseño del estudio: transversal, analítico, prospectivo y observacional. Métodos: se contactaron a 114 bailarines de diferentes escuelas y compañías de ballet de Lima, quienes respondieron una encuesta online relacionada con la presencia de DL en los últimos seis meses, los esguinces de tobillo en los últimos 12 meses, y otras variables sociodemográficas (edad, talla, peso, índice de masa corporal - IMC, años practicando ballet, y horas de práctica a la semana); así como covariables de inestabilidad de tobillo, lesión en el miembro inferior, hiperlaxitud ligamentaria, entre otras. Resultados: 47 participantes se incluyeron en el análisis del estudio, donde el 61.7 % era de sexo femenino y presentaba una mediana de 22 años de edad. Asimismo, el 57.5 % presentaba DL; y el 25.5 %, esguince de tobillo en los últimos 12 meses. Al asociar las variables al DL se encontró una relación significativa (p<0.05) con peso, IMC e inestabilidad de tobillo. Aun así, no se confirmó una asociación entre el esguince de tobillo y el DL. Conclusión: los hallazgos proporcionan un alto porcentaje de presencia de DL y una asociación significativa con respecto a padecer de inestabilidad de tobillo. / Background: low back pain (DL) and ankle sprain are very prevalent injuries in ballet dancers. Different studies relate both injuries, so it is suggested to carry out an investigation in this regard. Purpose: to determine if there is an association between ankle sprain and the presence of DL in ballet dancers older than 18 years old in the last year. Study design: analytical, prospective, observational and cross-sectional. Methods: 114 dancers from different schools and ballet companies in Lima were contacted; these responded to an online survey related to the presence of DL in the last six months, ankle sprain in the last 12 months, and other sociodemographic variables (age, height, weight, body mass index - BMI, years practicing ballet, and hours of practice per week); as well as covariates of ankle instability, lower limb injury, ligament hypermobilty, among others. Results: 47 participants were included in the study analysis, 61.7 % of which were female and were a median age of 22 years old. Also, 57.5 % had DL and 25.5 % had an ankle sprain in the last 12 months. When associating the variables to DL, a significant association (p<0.05) with weight, BMI and ankle instability was found. Nevertheless, an association between ankle sprain and DL was not confirmed. Conclusion: the findings provide a high percentage of the presence of DL and a significant association with suffering from ankle instability. / Tesis

No / We retrospectively reviewed the hospital records of 68 patients who had been referred with an injury to the posterolateral corner of the knee to a specialist knee surgeon between 2005 and 2009. These injuries were diagnosed based on a combination of clinical testing and imaging and arthroscopy when available. In all, 51 patients (75%) presented within 24 hours of their injury with a mean presentation at eight days (0 to 20) after the injury. A total of 63 patients (93%) had instability of the knee at presentation. There was a mean delay to the diagnosis of injury to the posterolateral corner of 30 months (0 to 420) from the time of injury. In all, the injuries in 49 patients (72%) were not identified at the time of the initial presentation, with the injury to the posterolateral corner only recognised in those patients who had severe multiple ligamentous injuries. The correct diagnosis, including injury to the posterolateral corner, had only been made in 34 patients (50%) at time of referral to a specialist knee clinic. MRI correctly identified 14 of 15 injuries when performed acutely (within 12 weeks of injury), but this was the case in only four of 15 patients in whom it was performed more than 12 weeks after the injury. Our study highlights a need for greater diligence in the examination and investigation of acute ligamentous injuries at the knee with symptoms of instability, in order to avoid failure to identify the true extent of the injury at the time when anatomical repair is most straightforward.

Title Atypical Pronation of the Sub-Talar Joint: Its Implications on the Lower Limb Background Atypical pronation of the sub-talar joint, or overpronation of the foot, as it is more commonly known, is a current subtopic in foot and lower limb-related biomechanical issues. Typical pronation is a tri-planar movement that involves eversion of the hindfoot, combined with abduction and dorsiflexion of the forefoot. Atypical pronation is recognized when this motion is excessive, and may be determined by the extent and duration to which this occurs according to the rhythmic timing during the gait pattern. It is a mechanical problem of the foot that primarily results from a subluxation or shift of the sub-talar joint and bones of the mid- and hind-foot. As a common finding in the general population, especially in those with flexible flat feet, atypical pronation may result chronically in a displacement of the bones and joints of the lower limb. Research has stated that excessive pronation of the ankle-foot complex may cause change in position of certain bones in the lower limb. This is believed to occur through an interaction between foot and pelvis through a kinetic chain mechanism. Furthermore, it has been stated that atypical pronation may affect weight transfer of the lower limb during gait that may...