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Clinical Orthopaedics and Related Research®

Erschienen in:

01.02.2011 | Symposium: Papers Presented at the Hip Society Meetings 2010

Improving Cup Positioning Using a Mechanical Navigation Instrument

verfasst von: Simon D. Steppacher, MD, Jens H. Kowal, PhD, Stephen Barry Murphy, MD

Erschienen in: Clinical Orthopaedics and Related Research® | Ausgabe 2/2011

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Abstract

Background

Although surgical navigation reduces the rate of malpositioned acetabular cups in total hip arthroplasty (THA), its use has not been widely adopted. As a result of our perceived need for simple and efficient methods of navigation, we developed a mechanical navigation device for acetabular cup orientation.

Questions/purposes

We assessed accuracy of cup orientation (mean error of cup inclination and anteversion) of a novel mechanical navigation device, percentage of outliers, length of operation, and compared the results with a series of CT-based computer-assisted THAs.

Methods

Cup orientation of 70 THAs performed using the mechanical navigation device was compared with a historical control group of 146 THAs performed using CT-based computer navigation. Postoperative cup orientation was measured using a validated two-dimensional/three-dimensional matching method. An outlier was defined outside a range of ± 10° from the planned inclination and/or anteversion.

Results

Using the mechanical navigation device, we observed a decrease in the errors of inclination (1.3° ± 3.4° [range, −6.6° to 8.2°] versus 3.5° ± 4.2° [−12.7° to 6.9°]), errors of anteversion (1.0° ± 4.1° [−8.8° to 9.5°] versus 3.0° ± 5.8° [−11.8° to 19.6°]), percentages of outliers (0% versus 9.6%), and length of operation (112 ± 22 [78–184] minutes versus 132 ± 18 [90–197] minutes) compared with CT-based navigation.

Conclusions

Compared with CT-based surgical navigation, navigation of acetabular cup orientation using a mechanical device can be performed in less time, lower mean errors, and minimal equipment.

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Titel: Improving Cup Positioning Using a Mechanical Navigation Instrument
verfasst von: Simon D. Steppacher, MD
Jens H. Kowal, PhD
Stephen Barry Murphy, MD
Publikationsdatum: 01.02.2011
Verlag: Springer-Verlag
Erschienen in: Clinical Orthopaedics and Related Research® / Ausgabe 2/2011
Print ISSN: 0009-921X
Elektronische ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-010-1553-8

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Improving Cup Positioning Using a Mechanical Navigation Instrument