A computer model for evaluating the osteotomy parameters of Chiari pelvic osteotomy |
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Authors: | Mohsen Karami Dariush Gouran Savadkoohi Ali Ghadirpoor Sina Rahimpoor Mahmood Azghani Farzam Farahmand |
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Institution: | (1) Department of Orthopaedics, Shahid Beheshti University, Tehran, Iran;(2) Sina Trauma Research Center, Tehran University of Medical Sciences, Tehran, Iran;(3) Sharif University of Technology, Tehran, Iran |
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Abstract: | This study was conducted to evaluate the effect of the various osteotomy parameters on the biomechanical aspects of the hip
joint on a computerised model. The data of the radiographs and a three-dimensional (3D) CT scan of six patients with coverage
deficient hip joint were used to construct a 3D computer model. Then Chiari type osteotomies were simulated using various
heights, angles and fibrocartilage thicknesses. A new angle called the mid acetabular center edge (MACE) angle was defined
in a mid coronal CT cut. The optimum displacement for obtaining the maximum coverage averaged 73%. The angle and height of
the osteotomy had a significant effect on the MACE angle (P value < 0.01). Our findings of these Chiari parameters may change the results of the osteotomy. The probability of adapting
the proximal osteotomy segment to a deformed femoral head was explained by the model and a modified osteotomy “multiple height
osteotomy” was proposed. |
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