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Fat-Suppressed 3D Spoiled Gradient-Echo MRI and MDCT Arthrography of Articular Cartilage in Patients with Hip Dysplasia

¹ Department of Orthopaedic Surgery, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
² Department of Radiology, Osaka University Medical School, Osaka 565-0871, Japan.
³ Department of Radiology, Osaka Seamen's Insurance Hospital, Osaka 552-0021, Japan.

View larger version (163K): [in a new window]   Fig. 1A —40-year-old woman with right hip dysplasia. Midcoronal (A) and midsagittal (B) views of 3D MR images and midcoronal (C) and midsagittal (D) views of CT arthrography images show hip joint. Acetabular and femoral cartilages were evaluated using zone classification shown in midsagittal images (B and D). Weight-bearing area was divided into three 30° ranges: superoanterior (a), superior (b), and superoposterior (c) zones.

View larger version (163K): [in a new window]   Fig. 1B —40-year-old woman with right hip dysplasia. Midcoronal (A) and midsagittal (B) views of 3D MR images and midcoronal (C) and midsagittal (D) views of CT arthrography images show hip joint. Acetabular and femoral cartilages were evaluated using zone classification shown in midsagittal images (B and D). Weight-bearing area was divided into three 30° ranges: superoanterior (a), superior (b), and superoposterior (c) zones.

View larger version (109K): [in a new window]   Fig. 1C —40-year-old woman with right hip dysplasia. Midcoronal (A) and midsagittal (B) views of 3D MR images and midcoronal (C) and midsagittal (D) views of CT arthrography images show hip joint. Acetabular and femoral cartilages were evaluated using zone classification shown in midsagittal images (B and D). Weight-bearing area was divided into three 30° ranges: superoanterior (a), superior (b), and superoposterior (c) zones.

View larger version (124K): [in a new window]   Fig. 1D —40-year-old woman with right hip dysplasia. Midcoronal (A) and midsagittal (B) views of 3D MR images and midcoronal (C) and midsagittal (D) views of CT arthrography images show hip joint. Acetabular and femoral cartilages were evaluated using zone classification shown in midsagittal images (B and D). Weight-bearing area was divided into three 30° ranges: superoanterior (a), superior (b), and superoposterior (c) zones.

View larger version (151K): [in a new window]   Fig. 2A —33-year-old woman with left hip dysplasia. MR image shows acetabular cartilage erosion (arrow); observers 1 and 2 diagnosed erosion as grade 1 and 2, respectively.

View larger version (113K): [in a new window]   Fig. 2B —33-year-old woman with left hip dysplasia. CT arthrography image shows acetabular cartilage erosion (arrow); observers 1 and 2 diagnosed erosion as grade 3.

View larger version (108K): [in a new window]   Fig. 2C —33-year-old woman with left hip dysplasia. Arthroscopy image shows grade 3 acetabular cartilage erosion in superoanterior area (arrow).

View larger version (159K): [in a new window]   Fig. 3A —35-year-old woman with right hip dysplasia. MR image (A) and CT arthrography image (B) show partial loss of cartilage thickness with subchondral bone hypertrophy and bone cyst formation in superoanterior area of acetabulum (arrow). Both observers rated acetabular cartilage as grade 2 on both imaging methods.

View larger version (117K): [in a new window]   Fig. 3B —35-year-old woman with right hip dysplasia. MR image (A) and CT arthrography image (B) show partial loss of cartilage thickness with subchondral bone hypertrophy and bone cyst formation in superoanterior area of acetabulum (arrow). Both observers rated acetabular cartilage as grade 2 on both imaging methods.

View larger version (115K): [in a new window]   Fig. 3C —35-year-old woman with right hip dysplasia. Arthroscopy image shows only fibrillation change without substance loss (grade 1) (arrows) in superoanterior area of acetabular cartilage.

View larger version (166K): [in a new window]   Fig. 4A —49-year-old woman with left hip dysplasia. On MR image, no acetabular cartilage contour defect was observed. Observers 1 and 2 ranked superoanterior area as grade 0 and 1, respectively; both observers ranked superior area as grade 0.

View larger version (120K): [in a new window]   Fig. 4B —49-year-old woman with left hip dysplasia. CT arthrography image allowed accurate evaluation of superoanterior and superior areas as grade 2 (arrows) by both observers.

View larger version (127K): [in a new window]   Fig. 4C —49-year-old woman with left hip dysplasia. Arthroscopy image shows grade 2 acetabular cartilage erosion in superoanterior (arrows) and superior area.

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