Three-dimensional CT reconstruction for analysis of normal acetabular spatial contour and its curvature transformation / 中国组织工程研究

ABSTRACT

BACKGROUND: The determination of the normal acetabular spatial contour, the pattern of its curvature transformation, and adaptability between acetabulum and femoral head plays an important role in the description of spatial relationship of the hip joint the management and evaluation of hip disorders, especially developmental dysplasia of the hip.OBJECTIVE: Based on spiral threa-dimensional CT data of normal hip joints, to create isoline map of each acetabulum and femoral head by a well-developed and cooperating programmed computer software so as to determine the normal acetabular spatial contour and the pattern of its curvature transformation.METHODS: Three-dimensional CT data of 56 normal hip joints, aged from 6 to 17 years, were collected. After three-dimensional simulation and surface shade display (SSD) reconstruction by a well-developed VxWork software, the isoline map was created using contours map in Gecmorphology, and each isoline map of the normal acetabulum and femoral head was analyzed via a specific computer software (Terrain). RESULTS AND CONCLUSION: The isoline array of normal acetabulum revealed the modality of some concentric "C" or oval "O",with at least one close "O" at the central zone, indicating that there existed dome shape at the superior zone of acetabulum. The modality of sparse isolines around dome illustrated larger curvature radius and more slowgoing change of spatial contour transformation of this zone, while the dense isolines on the bottom zone Of acetabulum represented a small curvature radius,steep shape, and rapid changing profile of this zone. The isoline array of normal femoral head was multiple concentric "O" with different space between each line. The congruence isolines of acetabular dome and superior surface of femoral head emerged as the similar trend of geomorphological characteristics, revealing that both the spatial contour and the curvature pattern between acatabulum and femoral head are well-adaptable to each other. Results show that the isolines of acatabulum and femoral headcan stersoscopicly visualize the spatial contour and curvature pattern of the topographic surface of the hip joint.