Aim: As precise operative control is difficult to achieve, the accuracy of femoral osteotomies can only be estimated. Therefore, a computer-assisted ultrasound navigation system was developed in order to apply an on-line control for femoral osteotomies.
Method: Three ultrasound emitters were fixed on a triangle. The exact position of triangles could be determined by measuring the time the ultrasound beam takes to reach microphones positioned in a frame. With a reference triangle fixed distally to the osteotomy and a second triangle fixed on the surgical chisel the exact correction angle can be determined three-dimensionally.
Results: A high degree of accuracy was found in both laboratory trials and in simulation trials using pig femurs. The deviation of measured values compared to a laser beam control was less than 0.5 degrees.
Conclusion: The system was introduced into our operating theatre as an optimised control device that can provide excellent support to the surgical procedure.
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