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Int J Med Robot. 2009 Jun;5(2):164-9. doi: 10.1002/rcs.243.

Tailor-made surgical guide based on rapid prototyping technique for cup insertion in total hip arthroplasty.

Author information

1
Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan. hana-osaka@umin.net

Abstract

BACKGROUND:

A surgical guide made by the rapid prototyping (RP) technique for cup insertion in total hip arthroplasty might be useful to avoid malalignment of the cup, which indicates postoperative complications.

METHODS:

To address this research question, we applied a RP-based guide to 24 patients with their CT images. We designed it to fit onto the acetabular edge and to insert a Kirschner wire (K-wire) which indicated a planned cup direction. We intraoperatively placed it on the acetabular edge, inserted the K-wire through the guide on the superior acetabulum and implanted the cup while observing the alignment of the K-wire. We also recorded the additional time needed to use the guide.

RESULTS:

The mean cup accuracy between planned and postoperative alignments was 2.8 degrees (SD = 2.1 degrees ) for abduction and 3.7 degrees (SD = 2.7 degrees ) for anteversion. The mean additional time was 3.5 (range 2-6) min.

CONCLUSION:

We can use this guide with acceptable accuracy and without consuming an excessive amount of time.

PMID:
19248055
DOI:
10.1002/rcs.243
[Indexed for MEDLINE]

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