Abstract
Objective. Show the use of computer navigation in exact screw positioning in the different pelvic
bones.
Background. Computer assisted pedicle screw insertion in the spine is an established procedure.
Screw fixation is also used in highly difficult pelvic and hip surgery (arthroplasty
revision surgery and tumor surgery).
Design. Insert as long screws as possible with computer navigation into the different bones
of the pelvis and compare these results with a non-computer controlled method.
Methods. The computer navigation was done with the system of Medivision (Oberdorf, Switzerland),
the software was SurgiGATE 2.1. Optically controlled spine instruments and a special
calibrated drill were used. The screw insertion with and without computer navigation
took place in seven real rapid prototyping pelvis models matched by pairs. Three screws
were inserted into the Os ileum, one into the Os pubis and one into the Os ischium.
The length of the inserted screws were measured and compared using routine statistic
methods.
Results. The mean screw length with vs. without computer navigation was 8.9 vs. 5.7 cm in
the Os ileum (P=0.0001), 6.0 vs. 4.2 cm in the Os pubis (P=0.01) and 4.3 vs. 3.9 cm in the Os ischium (not significant).
Conclusions. The use of computer navigation allows for the insertion of longer screws into the
bones of the pelvis (more exact positioning), which requires a more precise original
point of entry and direction of the drill (vector).
Relevance The insertion of fixation screws in highly difficult pelvic and hip surgery (revision
arthroplasty, tumor surgery) are another field for the use of computer navigation.
Keywords
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Article info
Publication history
Accepted:
April 9,
2002
Received:
April 30,
2001
Identification
Copyright
© 2002 Elsevier Science Ltd. Published by Elsevier Inc. All rights reserved.
