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Volume 3, Issue 4 (Suppl) J Clin Exp Orthop
ISSN:2471-8416 Osteoporosis and Arthroplasty 2017
December 04-05, 2017
&
11th International Conference on
Joint Event
OSTEOPOROSIS, ARTHRITIS & MUSCULOSKELETAL DISORDERS
December 04-05, 2017 | Madrid, Spain
10th INTERNATIONAL CONFERENCE ON ARTHROPLASTY
The trigonometric algorithm defining the true three-dimensional acetabular cup orientation: Correlation
between measured and calculated cup orientation angles
T E Snijders, T P C Schlösser, S M van Gaalen, R M Castelein, H Weinans and A de Gast
Clinical Orthopedic Research Center, The Netherlands
Background: Acetabular cup orientation plays a key role in implant stability and success rate of total hip arthroplasty (THA). To date,
the orientation is measured with different imaging modalities and definitions, leading to lack of consensus on optimal orientation.
A three-dimensional (3-D) concept, which measures orientation in the three anatomical perpendicular planes and describes their
mathematical relationship, enables universal definitions and quantifies cup orientation around the transverse axis in the sagittal
plane. The latter is important, because high-risk movements for dislocation are mainly around the transverse axis in the sagittal plane.
Purpose: To test the legitimacy and reliability of a 3-D concept to establish acetabular cup orientation.
Material & Methods: Twenty computed tomographic scans of patients with twenty-two primary THA in situ were systematically
collected. On multiplanar reconstructions, three observers independently measured cup orientation in terms of coronal inclination,
sagittal tilt and transverse version. The angles measured in two anatomical planes were used to calculate the angle in the third plane
via a trigonometric algorithm. For correlation and reliability analyses, intra- and interobserver differences between measured and
calculated angles were evaluated using the intra-class correlation coefficient (ICC).
Results: Measured and calculated angles had an ICC of 0.974 for coronal inclination, 0.993 for sagittal tilt and 0.993 for transverse
version. Intra- and interobserver reliability had an ICC of 0.987 and 0.987 for coronal inclination, 0.979 and 0.981 for sagittal tilt and
0.992 and 0.978 for transverse version, respectively.
Conclusion: The 3-D concept with its trigonometric algorithm is a legitimate and reliable measurement tool. This 3-D concept can
be used to determine the transverse version of acetabular cups from coronal inclination and sagittal tilt measurements. This offers
the opportunity to have universal definitions whatever imaging modality is used and introduces the sagittal tilt, that comprehends
the orientation of the cup around the transverse axis. Therefore, this straightforward 3-D concept can provide improved insight in
optimal cup orientation.
Recent Publications
1. Snijders T, van Gaalen SMand de Gast A (2017) Precision and accuracy of imageless navigation versus freehand implantation
of total hip arthroplasty: A systematic review and meta-analysis. International Journal of Medical Robotics and Computer
Assisted Surgery doi: 10.1002/rcs.1843.
2. Alessandro Liberati et al., (2009) The PRISMA statement for reporting systematic reviews and meta-analyses of studies that
evaluate health care interventions: explanation and elaboration. PLoS Med6(7): e1000100
Biography
T E Snijders is a Researcher working in Department of Orthopedics at Clinical Orthopedic Research Center – (CORC-mN). He is a Professor in Diakonessenhuis
Zeist in Netherlands. His research interests are Orthopedics and Trauma.
T E Snijders et al., J Clin Exp Orthop 2017, 3:4(Suppl)
DOI: 10.4172/2471-8416-C1-002