A computer model for evaluating the osteotomy parameters of Chiari pelvic osteotomy.
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.
Department of Orthopaedics, Shahid Beheshti University, Tehran, Iran. mn.karami@gmail.com
Mohsen
M
Karami
Dariush
D
Gouran Savadkoohi
Ali
A
Ghadirpoor
Sina
S
Rahimpour
Sina
S
Rahimpoor
Mahmood
M
Azghani
Farzam
F
Farahmand
D003198:Computer Simulation; D006618:Hip Dislocation, Congenital / Q000601:surgery*; D006621:Hip Joint / Q000000981:diagnostic imaging; D006801:Humans; D019060:Minimally Invasive Surgical Procedures; D008953:Models, Anatomic; D010027:Osteotomy / Q000379:methods*; D010384:Pelvic Bones / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D016896:Treatment Outcome