title: Preoperative imaging of Charcot neuroarthropathy in diabetic patients: comparison of ring PET, hybrid PET, and magnetic resonance imaging.
abstract: BACKGROUND
  The treatment of Charcot neuroarthropathy in the feet of diabetic patients has undergone fundamental changes in the last few years. Formerly, treatment was almost exclusively limited to nonoperative measures; since the late 1990s, however, current practice has shifted to early, stage-appropriate surgical therapy. The objective of this prospective study was to investigate the value of two types of positron emission tomography (PET) in the preoperative evaluation of diabetic patients with Charcot foot deformities.
  
  
  METHODS
  Ring [(18)F]FDG (2-fluoro-2-deoxy-glucose) and hybrid PET were compared to magnetic resonance imaging (MRI). MRI, ring PET, and hybrid PET imaging were used as part of the preoperative evaluation of 16 patients with type II diabetes mellitus. The diagnosis of Charcot neuropathy of the foot requiring operative treatment had been made on the basis of clinical and radiographic criteria.
  
  
  RESULTS
  Of 39 Charcot lesions confirmed at surgery, 37 were detected by ring PET, 30 by hybrid PET, and 31 by MRI.
  
  
  CONCLUSIONS
  PET (ring or hybrid) can be used in the evaluation of patients with metal implants that would compromise the accuracy of MRI. Another advantage of PET is its ability to distinguish between inflammatory and infectious soft-tissue lesions, and between osteomyelitis and Charcot neuroarthropathy. The differentiation between Charcot neuroarthropathy and florid osteomyelitis provides the surgeon with important additional information that often is unavailable from MRI. Because it provides important additional data, ring PET may be preferable to radiography and MRI in the preoperative evaluation of patients with Charcot neuroarthropathy of the foot. Hybrid PET, because of its poorer resolution compared to ring PET, appears less suitable for routine clinical application.
authors.affiliation: Department of Radiology, Justus-Liebig-University of Giessen, Klinikstrasse 36, D-35385 Giessen, Germany. stefan.hoepfner@web.de
authors.forename: Stefan
authors.initials: S
authors.lastname: Höpfner
authors.forename: Christoph
authors.initials: C
authors.lastname: Krolak
authors.forename: Stefan
authors.initials: S
authors.lastname: Kessler
authors.forename: Reinhold
authors.initials: R
authors.lastname: Tiling
authors.forename: Kirsten
authors.initials: K
authors.lastname: Brinkbäumer
authors.forename: Klaus
authors.initials: K
authors.lastname: Hahn
authors.forename: Stefan
authors.initials: S
authors.lastname: Dresel
mesh_terms: D000368:Aged; D001177:Arthropathy, Neurogenic / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D003924:Diabetes Mellitus, Type 2 / Q000150:complications*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010019:Osteomyelitis / Q000175:diagnosis; D049268:Positron-Emission Tomography; D011446:Prospective Studies; D012680:Sensitivity and Specificity