Extracción de proyectil acetabular por artroscopía de cadera / Acetabular bullet removal for hip arthroscopy

La extracción artroscópica de un proyectil articular de cadera por herida de bala se introdujo por primera vez por Cory y cols. en 1998. El misil puede ubicarse flotando libremente dentro de la articulación, ubicado cercano a esta o alojado dentro del hueso del acetábulo o de la cabeza femoral. Se presenta el caso de un paciente de treinta y dos años, quien fue asaltado. El proyectil se alojaba en el trasfondo del acetábulo luego de un trayecto abdominal.La artroscopía de cadera es un procedimiento mínimamente invasivo que resultó efectivo para el retiro de un proyectil articular, resultando menos cruento que una artrotomía. No se encontraron complicaciones. Nivel de Evidencia: III

Arthroscopic removal of a bullet from the hip joint was introduced first by Cory et al. in 1998. The missile can be located freely floating within the joint, located close to the joint, or lodged within the acetabulum bone or the femoral head. A case is presented in a thirty-two-year-old patient, who was assaulted. The projectile lodged in the background of acetabula fossa after an abdominal trajectory.Hip arthroscopy is a minimally invasive procedure that was effective for the removal of a joint projectile resulting in less morbidity than an arthrotomy. No complications were found. Level of Evidence: III

Can anodised zirconium implants stimulate bone formation? Preliminary study in rat model.

The mechanical properties and good biocompatibility of zirconium and some of its alloys make these materials good candidates for biomedical applications. The attractive in vivo performance of zirconium is mainly due to the presence of a protective oxide layer. In this preliminary study, the surface of pure zirconium modified by anodisation in acidic media at low potentials to enhance its barrier protection given by the oxides and osseointegration. Bare, commercially pure zirconium cylinders were compared to samples anodised at 30 V through electrochemical tests and scanning electron microscopy (SEM). For both conditions, in vivo tests were performed in a rat tibial osteotomy model. The histological features and fluorochrome-labelling changes of newly bone formed around the implants were evaluated on the non-decalcified sections 63 days after surgery. Electrochemical tests and SEM images show that the anodisation treatment increases the barrier effect over the material and the in vivo tests show continuous newly formed bone around the implant with a different amount of osteocytes in their lacunae depending on the region. There was no significant change in bone thickness around either kind of implant but the anodised samples had a significantly higher mineral apposition, suggesting that the anodisation treatment stimulates and assists the osseointegration process. We conclude that anodisation treatment at 30 V can stimulate the implant fixation in a rat model, making zirconium a strong candidate material for permanent implants.