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MIÉRCOLES / WEDNESDAY<br />

60<br />

if the stem anteversion is 10-20 degrees, the cup anteversion<br />

should be 20 degrees, whereas if the stem anteversion is 5<br />

degrees, the cup anteversion should be close to 30 degrees.<br />

We rarely exceed 30 degrees of cup anteversion because<br />

exceeding 30 degrees increases the risk of impingement in<br />

external rotation and abduction and extension in external<br />

rotation.<br />

REFERENCES<br />

1. Barrack, R. L.: Dislocation after total hip arthroplasty:<br />

implant design and orientation. J Am Acad Orthop Surg,<br />

11(2): 89-99, 2003.<br />

2. D’Lima, D. D.; Chen, P. C.; and Colwell, C. W., Jr.: Optimizing<br />

acetabular component position to minimize impingement<br />

and reduce contact stress. J Bone Joint Surg<br />

Am, 83-A Suppl 2 Pt 2: 87-91, 2001.<br />

3. D’Lima, D. D.; Urquhart, A. G.; Buehler, K. O.; Walker,<br />

R. H.; and Colwell, C. W., Jr.: The effect of the orientation<br />

of the acetabular and femoral components on the range<br />

of motion of the hip at different head-neck ratios. J Bone<br />

Joint Surg Am, 82(3): 315-21, 2000.<br />

4. Dorr LD: Hip arthroplasty. Minimally invasive techniques<br />

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Saunders Elsevier, 2006.<br />

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M.: Precision and Bias of Imageless Computer Navigation<br />

and Surgeon Estimates for Acetabular Component Position.<br />

Clin Orthop Relat Res, 2007 Dec; 465:92-9.<br />

6. Jolles, B. M.; Genoud, P.; and Hoffmeyer, P.: Computerassisted<br />

cup placement techniques in total hip arthroplasty<br />

improve accuracy of placement. Clin Orthop Relat Res,<br />

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7. Kalteis, T.; Handel, M.; Bathis, H.; Perlick, L.; Tingart, M.;<br />

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acetabular component in total hip arthroplasty: is it as<br />

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8. Lucas DH, S. R.: The Ranawat sign. A specific maneuver<br />

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9. Malik, A., and Dorr, L. D.: The science of minimally invasive<br />

total hip arthroplasty. Clin Orthop Relat Res, 463: 74-84,<br />

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10. Malik, A.; Maheshwari, A.; and Dorr, L. D.: Impingement<br />

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J. A.: The Frank Stinchfield Award: Morphologic features<br />

of the acetabulum and femur: anteversion angle and implant<br />

positioning. Clin Orthop Relat Res, (393): 52-65, 2001.<br />

12. McCollum, D. E., and Gray, W. J.: Dislocation after total<br />

hip arthroplasty. Causes and prevention. Clin Orthop Relat<br />

Res, (261): 159-70, 1990.<br />

13. McKibbin, B.: Anatomical factors in the stability of the hip<br />

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59, 1970.<br />

14. Parratte, S., and Argenson, J. N.: Validation and usefulness<br />

of a computer-assisted cup-positioning system in<br />

total hip arthroplasty. A prospective, randomized, controlled<br />

study. J Bone Joint Surg Am, 89(3): 494-9, 2007.<br />

15. Pierchon, F.; Pasquier, G.; Cotten, A.; Fontaine, C.; Clarisse,<br />

J.; and Duquennoy, A.: Causes of dislocation of total<br />

hip arthroplasty. CT study of component alignment. J Bone<br />

Joint Surg Br, 76(1): 45-8, 1994.<br />

16. Widmer, K. H., and Zurfluh, B.: Compliant positioning of<br />

total hip components for optimal range of motion. J Orthop<br />

Res, 22(4): 815-21, 2004.<br />

17. Wines, A. P., and McNicol, D.: Computed tomography<br />

measurement of the accuracy of component version in total<br />

hip arthroplasty. J Arthroplasty, 21(5): 696-701, 2006.<br />

18. Yoshimine, F.: The safe-zones for combined cup and neck<br />

anteversions that fulfill the essential range of motion and<br />

their optimum combination in total hip replacements. J Biomech,<br />

39(7): 1315-23, 2006.

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