RESUMO
The total hip replacement (THR) survival potential is linked to the material, to surgical technique and to patient's characteristics. Cemented and cementless systems exist in a wide variety of shapes, sizes, configurations, materials and surface treatments. Aseptic loosening remain the principal mechanism of prosthetic failure and the choice of right matching for each prosthesis-patient is the main issue to obtain a very good long-term implant fixation. Cement fixation is always solidly achieved but it can break down under mechanical and biological pressure. Stability with cementless fixation must be created by the initial bone response to the implant. Clinical studies and long-term results with THR showed that in patients with age between 60 and 70 years, it is important to analyze several parameters (bone quality and morphology, life-limiting diseases and levels of activity) to make the appropriate selection of components and type of fixation.
RESUMO
5 consecutive patients with osteoid osteoma were examined with bone scintigraphy and 67Ga scintigraphy. In 2 cases a 'three-phase' bone scintigraphy was performed. Scintigraphic features included obvious 67Ga uptake and diffusely increased accumulation on blood pool images. Thus, osteoid osteoma may possess the same scintigraphic characteristics as osteomyelitis.
