Three-dimensional distribution of acetabular cartilage thickness in patients with hip dysplasia: a fully automated computational analysis of MR imaging 

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Three-dimensional distribution of acetabular cartilage thickness in patients with hip dysplasia: a fully automated computational analysis of MR imaging  Takashi Nishii, M.D., Nobuhiko Sugano, M.D., Yoshinobu Sato, Ph.D., Hisashi Tanaka, M.D., Hidenobu Miki, M.D., Hideki Yoshikawa, M.D.  Osteoarthritis and Cartilage  Volume 12, Issue 8, Pages 650-657 (August 2004) DOI: 10.1016/j.joca.2004.04.009

Fig. 1 (A) Mid-sagittal MR image of right dysplastic hip in 45-year-old female patient. Acetabular and femoral cartilages at high signal were clearly contrasted with adjacent joint fluid and subchondral bone at low signal. Anterior portion of the joint was on the left side of the image. (B) Corresponding acetabular cartilage area was obtained using a fully automated computational method. Osteoarthritis and Cartilage 2004 12, 650-657DOI: (10.1016/j.joca.2004.04.009)

Fig. 2 (A) The celestial spherical coordinate system in the left acetabulum. (B) Definition of acetabular cartilage position by longitude and latitude in the celestial spherical coordinate. Osteoarthritis and Cartilage 2004 12, 650-657DOI: (10.1016/j.joca.2004.04.009)

Fig. 3 Average acetabular cartilage thickness distribution in the normal (A) and dysplastic (B) hips. The position of the cartilage is shown by longitude in the horizontal axis and latitude in the vertical axis. The scale represents cartilage thickness in millimeters. Osteoarthritis and Cartilage 2004 12, 650-657DOI: (10.1016/j.joca.2004.04.009)

Fig. 4 Graph illustrating cartilage thickness distribution in each row of the discrete regions with the same longitude grid of the normal hips (left) and dysplastic hips (right). A test was performed among the rows of the discrete regions with longitude ranging 90–120, 120–150, 150–180, 180–210, 210–240, and 240–270°, within the normal and dysplastic hips. A single asterisk indicates a significant difference at P<0.005, and a double asterisk indicates a significant difference at P<0.0001, compared with the row of the discrete regions with longitude ranging 240–270°. Osteoarthritis and Cartilage 2004 12, 650-657DOI: (10.1016/j.joca.2004.04.009)