Accuracy of corrective osteotomy using a custom-designed device based on a novel computer simulation system.

BACKGROUND

We developed an original computer program that three-dimensionally simulates anatomical deformity correction of an extremity based on computed tomography (CT) data and an operative method that uses a custom-designed surgical device to realize the simulation. The purpose of this study was to investigate the feasibility and accuracy of this system using cadaver bones.

METHODS

Twenty dry forearm bones were used to investigate the accuracy of this system. The error in the setting location of the template was evaluated as the difference between the setting location in the computer simulation and the actual setting location. A mock corrective osteotomy using a custom-made template was performed and the results were compared with the preoperative simulation.

RESULTS

All of the templates fitted snugly to the bone surface, and a mock osteotomy was performed as simulated. The errors in the setting location of the template on the bone surface were less than 1.0 mm and 1.0°. The accuracy of the simulation system as evaluated by a mock operation was also less than 1.0 mm and 1.0°.

CONCLUSIONS

The system has sufficient feasibility and accuracy to realize anatomical and precise 3-D deformity correction of an extremity.