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Three-dimensional magnetic resonance imaging in the coronal and sagittal planes was performed in 25 normal hips of 16 volunteers and 70 dysplastic hips of 50 patients with clinical symptoms but without radiologic joint space narrowing. A high prevalence of cartilage abnormalities was detected, mostly located at the anterosuperior area in the hip: 31 hips (44%) in the acetabular cartilage and five hips (7%) in the femoral cartilage showed a mild to moderate defect of cartilage thickness. The presence of cartilage abnormalities had a statistically significant correlation with age of the patients and severity of hip pain. Of 31 hips with cartilage abnormalities, sagittal magnetic resonance images showed abnormalities in 30 (97%), whereas coronal magnetic resonance images revealed abnormalities only in 11 (35%). A high incidence of cartilage abnormalities in the preradiologic stage suggests the need for more sensitive modalities for early diagnosis. Magnetic resonance imaging in the sagittal plane allows detailed assessment of early cartilage abnormalities.
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