Greater accuracy in positioning of the acetabular cup by using an image-free navigation system.

Abstract:

:In a prospective and randomised clinical study, acetabular cups were implanted free-hand (control group n=22) or with computer assistance using an image-free navigation system (study group n=23). The cup position was determined postoperatively on pelvic CT. An average inclination of 42.3 degrees (range: 30 degrees -53 degrees ; SD+/-7.0 degrees ) and an average anteversion of 24.0 degrees (range: -3 degrees to 51 degrees ; SD+/-15.0 degrees ) were found in the control group, and an average inclination of 45.0 degrees (range: 40 degrees -50 degrees ; SD+/-2.8 degrees ) and an average anteversion of 14.4 degrees (range: 5 degrees -25 degrees ; SS+/-5.0 degrees ) in the computer-assisted study group. The deviations from the desired cup position (45 degrees inclination, 15 degrees anteversion) were significantly lower in the computer-assisted study group (p<0.001 each). While only 11/22 of the cups in the control group were within the Lewinnek safe zone, 21/23 of the cups in the study group were placed in this target region (p=0.003).

journal_name

Int Orthop

authors

Kalteis T,Handel M,Herold T,Perlick L,Baethis H,Grifka J

doi

10.1007/s00264-005-0671-5

keywords:

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

272-6

issue

5

eissn

0341-2695

issn

1432-5195

journal_volume

29

pub_type

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