Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2013 Jun 11;48(1):62-68.
doi: 10.1016/j.rboe.2012.04.001. eCollection 2013 Jan-Feb.

Positioning of the acetabular component in cemented prostheses - radiographic calculation

Pedro José Labronici  1 , Ramon Louro Motta  2 , Bruno Bandeira Esteves  2 , José Sergio Franco  3 , Rolix Hoffmann  4 , Luiz Aurélio Costa Ferreira  5 , Marcos Giordano  6 , Sergio Delmonte Alves  7
Affiliations

Positioning of the acetabular component in cemented prostheses - radiographic calculation

Pedro José Labronici et al. Rev Bras Ortop. .

Abstract

Objective: to assess the reliability of the inclination angle and anteversion of acetabular cup component in patients with idiopatic osteoarthritis of the hip, aseptic necrosis and hip neck fracture using trigonometric formula and plain radiographs.

Methods: 66 patients underwent cemented total arthroplasty of 72 hips. The inclination of acetabular component was measured using plain radiograph. The acetabular component anteversion was measured using trigonometric formula.

Results: it was observed that, in the osteoarthritic hips, hip neck fracture and aseptic necrosis, the degree of agreement was highly significant (p < 0.0001), in the measurements of anteversion and inclination angles, among the three assessments, from intra as well as inter-observers. All the agreement pairs were of excellent degree (ICC > 0.80).

Conclusion: using plain radiographs and trigonometric formula, the method resulted to be highly accurate and reliable. Besides being easy to be calculated. No significant variation was found in the anteversion and inclination angles when compared with osteoarthritis of the hip, aseptic necrosis and hip neck fracture.

Keywords: Corneal transplantation; Keratitis; Mycobacteria atypical.

PubMed Disclaimer

Figures

Fig. 1
Fig. 1
Measurement of the inclination angle of the acetabular component. (a) – line tangential to the ischial tuberosities; (b) – line through the axis of the major diameter formed by the projection of the metal rim on the radiograph; (c) – acetabular inclination angle.
Fig. 2
Fig. 2
Measurement of the acetabular component by means of a trigonometric formula. Line D – distance of the maximum length of the diameter of the ellipse projected on the ring of the acetabular dome; point M – point marked at one-fifth of the distance of the maximum length of the diameter (D) of the ellipse projected on the ring of the acetabular dome; perpendicular distance (p) – perpendicular measurement from the point M to the metal ring.
See this image and copyright information in PMC

Similar articles

See all similar articles

References

    1. Charnley J. The long-term results of Low-friction arthroplasty of the hip performed as a primary Intervention. J Bone Joint Surg Br. 1972;54(1-B):61–76. - PubMed
    1. Murray D. The definition and measurement of acetabular orientation. J Bone JointSurg Br. 1993;75(2):228–232. - PubMed
    1. Hassan D.M., Johnston G.H., Dust W.N., Watson G., Dolovich A.T. Accuracy of intraoperative assessment of acetabular prosthesis placement. J Arthroplasty. 1998;13(1):80–84. - PubMed
    1. Muller O., Reize P., Trappmann D., Wulker N. Measuring anatomical acetabular cup orientation with a new X-ray technique. Comput Aided Surg. 2006;11(2):69–75. - PubMed
    1. Wan Z., Malik A., Jaramaz B., Chao L., Dorr L.D. Imaging and navigation measurement of acetabular component position in THA. Clin Orthop Relat Res. 2009;467(1):32–42. - PMC - PubMed

LinkOut - more resources