JBiSE  Vol.6 No.10 , October 2013
A method to calculate the acetabular cup anteversion after total hip replacement based on 3D coordinate system
ABSTRACT
Aim: To explore an accurate method to calculate acetabular cup anteversion after total hip arthroplasty. Method: 1) A 3D coordinate system was established with the center of the hip joint rotation center base as coordinate center. The acetabular exit plane and Pettersson formula acetabular anteversion and Riten Pradhan formula acetabular anteversion and acetabular true anteversion were drawn; 2) Determine the mathematical expression of Pettersson formula acetabular anteversion α and Riten Pradhan formula acetabular anteversion β in the coordinate system. The true acetabular anteversion is projection angle of Pettersson formula acetabular anteversion α on cross-section in the presence of acetabular abduction δ, determining mathematical expression of the acetabular anteversion θ by trigonometric functions. Results: Real acetabular cup anteversion θ = arctg (tgβ/cosδ). Conclusion: The true acetabular cup anteversion and Pettersson formula anteversion and Riten Pradhan for mula anteversion were quite different. The difference was increased with the acetabular cup abduction angle increased. The formula was simple and accurate and worthy of clinical reference.

Cite this paper
Zhang, Z. , Sun, F. , Li, J. , Li, H. , Deng, Y. and Yin, G. (2013) A method to calculate the acetabular cup anteversion after total hip replacement based on 3D coordinate system. Journal of Biomedical Science and Engineering, 6, 964-966. doi: 10.4236/jbise.2013.610119.
References
[1]   innek, G.E., Lewis, T.L., Tarr, R., et al. (1978) Dislocations after total hip replacement arthroplastics. Journal of Bone and Joint Surgery, 60, 217-220.

[2]   Bader, R., Scholz, R., Steinhauser, E., et al. (2004) The influence of head and neck geometry on stability of total hip replacement: A mechanical test study. Acta Orthopaedica Scandinavica, 75, 415-421.
http://dx.doi.org/10.1080/00016470410001178-1

[3]   Barrack, R.L. (2003) Dislocation after total hip arthroplasty: Impant design and orientation. Journal of the American Academy of Orthopaedic Surgeons, 11, 89-99.

[4]   Pettersson, H., Gentz, C.F., Hnberg, H.O., et al. (1982) Radiologic evaluation of the position of the acetabular component of the total hip prosthesis. Acta Radiologica: Diagnosis, 23, 259-263.

[5]   Pradhan, R. (1999) Planar anteversion of the acetabular cup as determined from plain anteroposterior radiograps. Journal of Bone and Joint Surgery, 81, 431-435.
http://dx.doi.org/10.1302/0301-620X.81B3.9067

[6]   Zhu, T.Y. (1995) Dynamic measurement of the angles of acetabular abduction and anteversion and its clinical significance. Chinese Journal of Orthopaedics, 15, 497-499.

 
 
Top