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Registration accuracy in computer-assisted pelvic surgery.

P L Docquier¹, L Paul, O Cartiaux

¹Department of Orthopaedic Surgery, Saint-Luc University Hospital (Université catholique de Louvain), Brussels, Belgium. Pierre-Louis.Docquier@uclouvain.be

Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery

|June 13, 2009

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Computer-assisted surgery systems improve pelvic tumor resection accuracy. Optimal placement of the dynamic reference base (DRB) and sampling area are key for precise registration in computer-assisted pelvic surgery.

Area of Science:

Orthopaedic Surgery
Medical Imaging
Computer-Assisted Surgery

Background:

In vitro study to evaluate computer-assisted system accuracy in pelvic surgery.
System applied to a simulated pelvic tumor resection using a sawbone model.

Purpose of the Study:

Assess global registration accuracy of a computer-assisted system.
Quantify accuracy errors in pelvic orthopaedic surgery simulations.

Main Methods:

Twenty pelvic landmarks created; virtual model generated from CT scan.
Surface-based matching algorithm used for sawbone registration.
Landmark deviations calculated to determine global accuracy error.

Main Results:

Initialization point location did not impact accuracy.

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Dynamic reference base (DRB) placement away from the working area yielded best results.

Accuracy improved with increased sampling area, but decreased with excessive expansion.

Conclusions:

DRB placement on the contralateral side of the pelvis is recommended.
Posterior extension and inclusion of the entire working area in the sampling surface enhance accuracy.
Optimizing DRB and sampling area improves computer-assisted pelvic surgery precision.