A computer model for evaluating the osteotomy parameters of Chiari pelvic osteotomy

作者：Karami Mohsen^*; Savadkoohi Dariush Gouran; Ghadirpoor Ali; Rahimpoor Sina; Azghani Mahmood; Farahmand Farzam

来源：International Orthopaedics, 2010, 34(3): 329-333.

DOI：10.1007/s00264-009-0769-2

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.

• 出版日期2010-3