Predictores de dolor anterior de rodilla en pacientes operados de artroplastia total de rodilla sin reemplazo patelar / Predictors of anterior knee pain in patients operated of arthroplasty total knee without patellar replacement

Osteoarthrosis of the knee is one of the most important causes of disability around the world, being total knee arthroplasty (TKA) a cost-effective surgical procedure for treating its severe stage when all knee compartments are compromised. Despite the good functional results and good survival of the implants and of the patients, still, 15 to 20% of the patients are dissatisfied after surgery. One of the causes of dissatisfaction is persistent pain located in the anterior part of the knee, which leads to controversy over whether to perform the patellar replacement. Advantages and complications are described in both scenarios, and neither is superior to the other in pain and implant survival. In the case of TKA without patellar replacement, the position of the femoral component plays a crucial role in achieving normal patellar tracking. The current challenge is to determine those clinical and radiological variables that allow us to predict the absence of long-term anterior pain in patients who require TKA and who do not undergo patellar replacement. (AU)

Relación entre el signo de entrecruzamiento y el ángulo de versión acetabular en tomografía axial computada / Association between the crossover sign and the acetabular version angle in axial computed tomography

Introduction.The crossover sign (CS) is proposed in the diagnosis of pincer-type femoroacetabular impingement (FAI). CS occurs in the cranial region of the acetabulum while the acetabular version angle (AV) is measured in the region where the acetabulum becomes deeper. Objective. To determine whether AV values measured in cranial regions using the classical measures relate better to the findings for positive CS. Material and Methods. Cross sectional study in asymptomatic patients. Images were obtained by CT of the abdomen and pelvis. They were recored in anterior-posterior reconstruction the CS and in axial reconstruction the AV angle. Logistic regression models for measuring AV in 7 cephalic levels to caudal with 95 percent CI were estimated. Results. 104 patients were measured. At Level 3 an area under ROC curve 0.81 (0.74-0.87), cutoff value of 11.2 degrees with sensitivity of 80.0 percent and specificity of 73.0 percent, was obtained. Conclusion. AV at level 3 has higher diagnostic capacity for the presence of positive CS.

Introducción. El signo de entrecruzamiento (SE) es propuesto en el diagnóstico imagenológico del pinzamiento Femoroacetabular tipo Pincer. El SE se produce en la región craneal del acetábulo, mientras que el ángulo de versión acetabular (VA) se mide en la región donde el acetábulo se hace más profundo. Objetivo. Determinar si valores de VA medidos en regiones craneales a la medida clásica se relacionan mejor al hallazgo de SE positivo. Material y Método. Estudio transversal en pacientes asintomáticos. Se obtuvieron imágenes mediante TC de abdomen y pelvis. Fueron consignados en reconstrucción antero-posterior el SE y en reconstrucción axial el ángulo de VA. Se estimaron modelos de regresión logística para la medición de VA en 7 niveles de cefálico a caudal con IC 95 porciento. Resultados. Fueron medidos 104 pacientes. En nivel 3 se obtuvo un área bajo curva ROC 0.81 (0.74-0.87), valor de corte 11.2 grados con sensibilidad de 80.0 porciento y especificidad de 73.0 porciento. Conclusión. VA en nivel 3 tiene mayor capacidad diagnóstica de la presencia de SE positivo.