title: Sonographic evaluation of the medial aspect of the knee in a population-based cohort study.
abstract: OBJECTIVE
  The aim of this study was to evaluate the medial aspect of the knee with ultrasound (US).
  
  
  METHODS
  This study included 71 men and 154 women (450 knees) with a mean age of 65 years. US was used to evaluate the medial joint space of both knees with and without weight-bearing. In each subject, the medial radial displacement of the medial meniscus, the peripheral joint space, and the number of osteophytes were evaluated. The subjects were stratified by age into five groups: 40-49 years, 50-59 years, 60-69 years, 70-79 years, and 80 years and older, and the US findings in each group were compared.
  
  
  RESULTS
  Statistically significant differences were noted between the 60-69 and over-80 age groups in medial radial displacements and peripheral joint spaces (p < 0.01 for both). The number of osteophytes significantly increased after 60 years of age (p < 0.01).
  
  
  CONCLUSIONS
  We believe that US is a useful tool for making a simple evaluation of the intra-articular components in population-based studies.
authors.affiliation: Department of Orthopaedic Surgery, Gunma University Graduate School of Medicine, Gunma, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Yanagisawa
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohsawa
authors.forename: Kenichi
authors.initials: K
authors.lastname: Saito
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yamamoto
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Tajika
authors.forename: Kenji
authors.initials: K
authors.lastname: Takagishi
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging*; D007719:Knee Joint / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D054850:Osteophyte / Q000000981:diagnostic imaging*; D014463:Ultrasonography
keywords: knee; meniscus; musculoskeletal; ultrasonography