Abstract
Objective:
Periacetabular spherical osteotomy for the treatment of dysplastic hip is effective but technically demanding. To help surgeons perform this difficult procedure reliably and safely, a computer assisted navigation technique has been developed and evaluated.
Methods:
Computed tomographic scans of 5 cadaveric pelvises were obtained and three-dimensional models were generated. The osteotomy was planned preoperatively. The pelvises were registered using an optimized algorithm. Periacetabular spherical osteotomy was performed at one side of each pelvis with navigation and at another side without navigation. The deviation of the real osteotomized surface from the planned surface was measured.
Results:
The computer assisted navigation system supported preoperative planning and provided real time display of the surgical procedure. The deviation of the real osteotomized surface from the planned surface was 1.59 ± 0.18 mm in the group with navigation, while 4.81 ± 1.67 mm in the group without navigation. The difference of the deviations has statistical significance (p < 0.003).
Conclusion:
A computer assisted navigation technique is able to help increase accuracy and safety of periacetabular spherical osteotomy, and thus facilitate performing this difficult procedure.
