title: Yttrium-90 distribution following radiosynoviorthesis of the knee joint in rheumatoid arthritis patients: a SPECT/CT study.
abstract: OBJECTIVE
  To examine yttrium-90 distribution 1 and 72 h following its injection into a knee joint in patients with rheumatoid arthritis (RA).
  
  
  METHODS
  In 14 RA patients we injected yttrium-90 into the affected knee joint using lateral approach. To assess the radioisotope distribution in the joint, the superimposed sequential SPECT and CT imaging was performed 1 and 72 h after the injection. We analyzed the percentage of radioisotope distribution in three predefined compartments of the knee joint (lower, upper medial, upper lateral).
  
  
  RESULTS
  After 1 and 72 h, the mean percentage distributions were, respectively, 7.14 and 23.07% in lower; 21.42 and 15.38% in upper medial, and 71.42 and 61.53% in upper lateral compartment. The percentage of isotope deposition did not change significantly with time in any of the compartments (all p > 0.26). The deposition of isotope, both at 1 and 72 h, was significantly greater in upper lateral compartment, where the injection was performed, than in all other compartments (all p < 0.05).
  
  
  CONCLUSIONS
  Using the SPECT/CT hybrid method, we proved that the majority of isotope is located at the compartment adjacent to the injection. Two injections targeting different compartments might improve the clinical efficacy of the procedure.
authors.affiliation: Department of Rheumatology and Balneology, Jagiellonian University Medical College, Sniadeckich 10, 31-501, Kraków, Poland, aneta.bielinska@uj.edu.pl.
authors.forename: A
authors.initials: A
authors.lastname: Bielińska
authors.forename: M
authors.initials: M
authors.lastname: Korkosz
authors.forename: J
authors.initials: J
authors.lastname: Gąsowski
authors.forename: M
authors.initials: M
authors.lastname: Tomaszuk
authors.forename: A
authors.initials: A
authors.lastname: Staszczak-Sowa
authors.forename: B
authors.initials: B
authors.lastname: Kwaśny-Krochin
authors.forename: M
authors.initials: M
authors.lastname: Buziak-Bereza
authors.forename: A
authors.initials: A
authors.lastname: Hubalewska-Dydejczyk
authors.forename: T
authors.initials: T
authors.lastname: Grodzicki
mesh_terms: D001172:Arthritis, Rheumatoid / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D000074402:Synovectomy; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed; D015021:Yttrium Radioisotopes / Q000378:metabolism
chemical_list: D015021:Yttrium Radioisotopes