title: [Value of bone angioscintigraphy (isotope transit) in atraumatic osteonecrosis of the head of the femur].
abstract: Bone angioscintigraphy (isotopic transit) imaging provides a time-activity curve of two symmetrical joint regions (one of which is supposedly diseased) during the first few seconds following radioisotope injections, in this case 99mTc MDP. The curve obtained presents as two parts: a short rapid slope corresponding to the presence of the marker in the arteries of the region, and a slowly ascending slope corresponding to invasion of capillary bed without extravascular diffusion during the first minute. This method was used to study 22 cases of confirmed unilateral osteonecrosis of hip. In 20 of the 22 cases the height of the curve differed from one side to another: lower on the diseased side in 9 cases (negative gradient), 8 of these 9 patients having stages I and II (early stages) of the affection. It is suggested that this reduction in activity of the diseased side is due to a reduction in capillary bed from medullary necrosis, and that it constitutes a sign in favor of necrosis, particularly when radiologic signs are few or absent as in the early stages.
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005270:Femur Head / Q000098:blood supply; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D013669:Technetium Tc 99m Medronate
chemical_list: D013669:Technetium Tc 99m Medronate
vernacular_title: Intérêt de l'étude de l'angioscintigraphie osseuse (transit isotopique) dans les ostéonécroses non traumatiques de la tête fémorale.