title: Diffusely increased bone scintigraphic uptake in patellofemoral pain syndrome.
abstract: OBJECTIVE
  Painful disorders of the patellofemoral joint are one of the most frequent complaints in orthopaedic and sports medicine. The aims of this study were to determine whether bone scintigrams of patients suffering from patellofemoral pain syndrome (PFPS) show diffuse uptake and in what bony compartment of the knee uptake, if any, was localised.
  
  
  METHODS
  Fifty eight patients with chronic PFPS were examined. All patients underwent a detailed clinical history and a thorough physical examination of the knee. Anterior and lateral static images of both knees were made using a gamma camera 3 h after injection of 550 MBq of (99m)Tc-HMDP. Two experienced radiologists visually evaluated the scans blindly and separately. As 51 patients had bilateral pain, 109 painful knees are included in the results.
  
  
  RESULTS
  Diffuse uptake on bone scintigrams was found in 48 knees in 30 of the patients. In 33 knees the uptake was localised to only one bone compartment, in 10 knees diffuse uptake was found in two of the bones forming the knee joint, and in six knees all three bone compartments (the distal femur, the patella, and the proximal tibia) exhibited diffuse uptake.
  
  
  CONCLUSIONS
  Scintigrams of approximately half of the patients with PFPS will show diffuse uptake in one or more of the bony compartments of the knee joint and radioactive tracer accumulation will occur as often in the proximal tibia as in the patella.
authors.affiliation: Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden. j.naslund@mailbox.calypso.net <j.naslund@mailbox.calypso.net>
authors.forename: J E
authors.initials: JE
authors.lastname: Näslund
authors.forename: S
authors.initials: S
authors.lastname: Odenbring
authors.forename: U-B
authors.initials: UB
authors.lastname: Näslund
authors.forename: T
authors.initials: T
authors.lastname: Lundeberg
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D046788:Patellofemoral Pain Syndrome / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D016059:Range of Motion, Articular; D013669:Technetium Tc 99m Medronate / Q000031:analogs & derivatives*
chemical_list: D019275:Radiopharmaceuticals; C024226:technetium Tc 99m hydroxymethylene diphosphonate; D013669:Technetium Tc 99m Medronate
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