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Journal of Bone and Joint Surgery - British Volume, Vol 88-B, Issue 2, 163-167.
doi: 10.1302/0301-620X.88B2.17163  
Copyright © 2006 by British Editorial Society of Bone and Joint Surgery
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Imageless navigation for insertion of the acetabular component in total hip arthroplasty

IS IT AS ACCURATE AS CT-BASED NAVIGATION?

T. Kalteis, MD, Orthopaedic Surgeon1; M. Handel, MD, Orthopaedic Surgeon1; H. Bäthis, MD, Orthopaedic Surgeon1; L. Perlick, MD, Orthopaedic Surgeon1; M. Tingart, MD, Orthopaedic Surgeon1; and J. Grifka, MD, Orthopaedic Surgeon, Professor and Head of Department1

1 Department of Orthopaedic Surgery, University of Regensburg, Asklepios Klinikum Bad Abbach, Kaiser-Karl V.-Allee 3, 93077 Bad Abbach, Germany.

Correspondence should be sent to Dr T. Kalteis; e-mail: thomas.kalteis{at}klinik.uni-regensburg.de

In a prospective randomised clinical study acetabular components were implanted either freehand (n = 30) or using CT-based (n = 30) or imageless navigation (n = 30). The position of the component was determined post-operatively on CT scans of the pelvis.

Following conventional freehand placement of the acetabular component, only 14 of the 30 were within the safe zone as defined by Lewinnek et al (40° inclination SD 10°; 15° anteversion SD 10°). After computer-assisted navigation 25 of 30 acetabular components (CT-based) and 28 of 30 components (imageless) were positioned within this limit (overall p < 0.001). No significant differences were observed between CT-based and imageless navigation (p = 0.23); both showed a significant reduction in variation of the position of the acetabular component compared with conventional freehand arthroplasty (p < 0.001). The duration of the operation was increased by eight minutes with imageless and by 17 minutes with CT-based navigation.

Imageless navigation proved as reliable as that using CT in positioning the acetabular component.




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Imageless navigation for insertion of the acetabular component in total hip arthroplasty
Paul d Hamilton, et al.
J Bone Joint Surg Br Online, 31 Mar 2006 [Full text]

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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General