Biomechanical Analysis After Chiari’s Pelvic Osteotomy by Means of Superimposed Pelvic Computed Tomography Scan

  • Genji Fujii
  • Minoru Sakurai
  • Hidemitsu Kumeta
  • Kanichi Funayama


Changes in the bony and muscular structure of the pelvis after Chiari’s pelvic osteotomy were investigated in 18 hips (18 females patients) by means of pre- and postoperative computed tomography. After operation, the distance between the centers of the femoral heads decreased by an average of 0.7 cm and that between the anterior-superior iliac spines increased by an average of 1.1 cm. The iliac wing of the operated side was displaced laterally, but that of the non-operated side remained unchanged. Femoral head coverage improved from 53.3% to 88.1% postoperatively. On simulation, the direction of the vector of the gluteus medius and the resultant force changed vertically, from a preoperative value of 21.6° to 16.7° and from 14.9° to 11.1°, respectively, after operation. The resultant force on the femoral head decreased from a preoperative value of 3.42 W to 2.92 W after operation. In our method of Chiari’s osteotomy the inferior fragment was medialized, while the superior fragment was simultaneously displaced laterally; consequently biomechanical improvement was achieved.


Femoral Head Resultant Force Acetabular Dysplasia Biomechanical Analysis Gluteus Medius 
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Copyright information

© Springer-Verlag Tokyo 1993

Authors and Affiliations

  • Genji Fujii
  • Minoru Sakurai
    • 1
  • Hidemitsu Kumeta
    • 2
  • Kanichi Funayama
    • 3
  1. 1.Department of Orthopaedic SurgeryTohoku University School of MedicineAoba-ku, Sendai, 980Japan
  2. 2.Department of Orthopaedic SurgeryNagano Central HospitalNagano, 380Japan
  3. 3.Department of Orthopaedic SurgerySendai Red Cross HospitalTaihaku-ku, Sendai, 982Japan

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