title: MRI of joint fluid in femoral head osteonecrosis.
abstract: OBJECTIVE
  To evaluate the relationship between joint fluid, intramedullary pressure (IMP), bone marrow edema, and stages of osteonecrosis of the femoral head (ONFH).
  
  
  METHODS
  We reviewed the magnetic resonance (MR) images of 28 patients with 40 documented ONFHs. IMP was measured in 16 symptomatic hips. The amount of joint fluid was graded as 0 (no fluid), 1 (fluid <5 mm in width), or 2 (fluid > or = 5 mm in width) adjacent to the entire length of the femoral neck. Associated focal and diffuse bone marrow abnormalities were evaluated. A control group of 29 recruited individuals without symptoms related to hip disease were examined. Follow-up MR images were obtained in four patients (five affected hips) 6-10 months after core decompression.
  
  
  RESULTS
  Of the 40 affected hips, the severity of ONFH was divided into stages 0 (n=4), I (n=28), and II (n=8 hips) on MR findings. The correlation of joint fluid to IMP and to the presence of bone marrow edema was poor. The amount of joint fluid correlated significantly with the stage of ONFH. None of the five affected hips showed decreased joint fluid on follow-up MR images.
  
  
  CONCLUSIONS
  The amount of joint fluid correlates well with the stage of ONFH. The amount of joint fluid does not correlate with IMP or bone marrow edema.
authors.affiliation: Department of Radiology, Taipei Medical University, Municipal Wan Fang Hospital, 111 Hsing-Long Road, Section 3, Taipei 116, Taiwan ROC.
authors.forename: W P
authors.initials: WP
authors.lastname: Chan
authors.forename: Y-J
authors.initials: YJ
authors.lastname: Liu
authors.forename: G-S
authors.initials: GS
authors.lastname: Huang
authors.forename: C-C
authors.initials: CC
authors.lastname: Jiang
authors.forename: S
authors.initials: S
authors.lastname: Huang
authors.forename: Y-C
authors.initials: YC
authors.lastname: Chang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001853:Bone Marrow / Q000473:pathology / Q000503:physiopathology; D004487:Edema / Q000473:pathology; D005260:Female; D005271:Femur Head Necrosis / Q000473:pathology* / Q000503:physiopathology; D006621:Hip Joint / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D013582:Synovial Fluid