[Intraarticular lesions associated with tibial fixation during anterior cruciate ligament reconstruction]. / Lesiones intraarticulares asociadas a la fijación tibial en la reconstrucción del ligamento cruzado anterior.

Anterior cruciate ligament reconstruction is a demanding procedure; complications may arise at any of its stages. This is the report of three cases in which the tibial fixation devices (IntraFix and Bio-IntraFix) led to intraarticular lesions. The complications were detected in one of the cases while the patient was still in the operating room and in the remaining two during the follow-up. All the patients had a stable knee, but all of them sustained chondral lesions resulting from the inadequate placement of the implants used for tibial fixation. Several suggestions to avoid the complications stemming from these devices are provided.

La reconstrucción del ligamento cruzado anterior es un procedimiento exigente; las complicaciones pueden presentarse en cualquiera de sus etapas. Presentamos tres casos en los cuales los dispositivos para la fijación tibial (IntraFix y Bio-IntraFix) condicionaron lesiones intraarticulares. Las complicaciones fueron detectadas, en uno de los casos, mientras el paciente se encontraba aún en la sala de operaciones, y en los otros dos, durante el seguimiento. Todos los pacientes contaban con una rodilla estable, pero tuvieron lesiones condrales causadas por la inadecuada colocación de los implantes para la fijación tibial. Se exponen algunas sugerencias para evitar complicaciones con estos dispositivos.

Lesiones intraarticulares asociadas a la fijación tibial en la reconstrucción del ligamento cruzado anterior / Intraarticular lesions associated to a tibial fixation device in anterior cruciate ligament reconstruction

Resumen: La reconstrucción del ligamento cruzado anterior es un procedimiento exigente; las complicaciones pueden presentarse en cualquiera de sus etapas. Presentamos tres casos en los cuales los dispositivos para la fijación tibial (IntraFix y Bio-IntraFix) condicionaron lesiones intraarticulares. Las complicaciones fueron detectadas, en uno de los casos, mientras el paciente se encontraba aún en la sala de operaciones, y en los otros dos, durante el seguimiento. Todos los pacientes contaban con una rodilla estable, pero tuvieron lesiones condrales causadas por la inadecuada colocación de los implantes para la fijación tibial. Se exponen algunas sugerencias para evitar complicaciones con estos dispositivos.

Abstract: Anterior cruciate ligament reconstruction is a demanding procedure; complications may arise at any of its stages. This is the report of three cases in which the tibial fixation devices (IntraFix and Bio-IntraFix) led to intraarticular lesions. The complications were detected in one of the cases while the patient was still in the operating room and in the remaining two during the follow-up. All the patients had a stable knee, but all of them sustained chondral lesions resulting from the inadequate placement of the implants used for tibial fixation. Several suggestions to avoid the complications stemming from these devices are provided.

Colitis ulcerativa grave en paciente con infección por virus de inmunodeficiencia humana: reporte de caso / A Case Report of Severe Ulcerative Colitis in an HIV Patient

Se presenta el caso de un paciente con colitis ulcerativa (CU) grave de nueva aparición y diagnóstico simultáneo de infección por virus de inmunodeficiencia humana (VIH). Dos enfermedades inmunológica y fisiopatológicamente opuestas, que raramente se asocian. Incluso se plantea que en la infección por VIH, la enfermedad inflamatoria intestinal (EII) puede ser menos agresiva. El diagnóstico se convierte en un reto, dado el espectro de enfermedades que pueden afectar el colón en el contexto de infección por VIH. Asimismo, el tratamiento es controversial teniendo en cuenta que el uso de inmunomoduladores o biológicos bloquean otro componente del sistema inmune que podría potenciar el estado de inmunosupresión en este grupo de pacientes. La historia natural, el tratamiento y el pronóstico, continúan siendo un desafío para la evidencia actual.

We present the case of a patient with severe de novo ulcerative colitis (CU) and a simultaneous diagnosis of Human Immunodeficiency Virus (HIV) infection. These two immunologically and pathophysiologically opposing diseases are rarely found in association, and it has even been suggested that inflammatory bowel disease (IAS) may be less aggressive in HIV infections. The diagnosis is challenging, given the spectrum of diseases that can affect the colon in the context of an HIV infection. Treatment is similarly controversial considering that the use of immunomodulators or biological block another component of the immune system that could enhance the state of immunosuppression in this group of patients. Natural history, treatment and prognosis remain a challenge for currently available evidence

Degradation of paracetamol by advance oxidation processes using modified reticulated vitreous carbon electrodes with TiO(2) and CuO/TiO(2)/Al(2)O(3).

The degradation of paracetamol in aqueous solutions in the presence of hydrogen peroxide was carried out by photochemistry, electrolysis and photoelectrolysis using modified 100 pores per inch reticulated vitreous carbon electrodes. The electrodes were coated with catalysts such as TiO(2) and CuO/TiO(2)/Al(2)O(3) by electrophoresis followed by heat treatment. The results of the electrolysis with bare reticulated vitreous carbon electrodes show that 90% paracetamol degradation occurs in 4 h at 1.3 V vs. SCE, forming intermediates such as benzoquinone and carboxylic acids followed by their complete mineralisation. When the electrolysis was carried out with the modified electrodes such as TiO(2)/RVC, 90% degradation was achieved in 2 h while with CuO/TiO(2)/Al(2)O(3)/RVC, 98% degradation took only 1 h. The degradation was also carried out in the presence of UV reaching 95% degradation with TiO(2)/RVC/UV and 99% with CuO/TiO(2)/Al(2)O(3)/RVC/UV in 1 h. The reactions were followed by spectroscopy UV-Vis, HPLC and total organic carbon analysis. These studies show that the degradation of paracetamol follows a pseudo-first order reaction kinetics.

A germination bioassay as a toxicological screening system for studying the effects of potential prodrugs of naproxen.

A germination bioassay with radish (Raphanus sativus L.) seeds was developed as a toxicological screening system for assessing the effects of new potential prodrugs of naproxen, as an alternative to animals and animal cell toxicity screens. Both enantiomers of naproxen (6-methoxy-α-methyl-2-naphthaleneacetic acid) and naproxol (6-methoxy-ß-2-naphthaleneethanol), and their racemic mixtures, inhibited the radicle growth of R. sativus at a concentration of 1mM, while only (R)-(+ )-naproxol and racemic naproxol inhibited the hypocotyl growth of R. sativus at the same concentration. Four novel combinatorial esters, naproxen naproxyl esters (6-methoxy-ß-methyl-2-naphthaleneethyl 6-methoxy-α-methyl-2-naphthaleneacetate), resulting from the combinatorial chemistry of the esterification reaction between naproxen and naproxol, were synthesised and then tested in the germination bioassay, at a concentration of 0.5mM. It was found that they did not inhibit either the radicle or the hypocotyl growth of R. sativus.