Comment on

• Dislocations after total hip-replacement arthroplasties.

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• Analysis of version in the acetabular cup.

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• Measurements of pelvic flexion angle using three-dimensional computed tomography.

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• Pelvic tilt makes acetabular cup navigation inaccurate.

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• The rationale for tilt-adjusted acetabular cup navigation.

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• Correction of acetabular cup orientation measurements for X-ray beam offset.

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• Optimization of total hip arthroplasty implantation: is the anterior pelvic plane concept valid?

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• A validation model for measurement of acetabular component position.

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• Cup anteversion in hip resurfacing: validation of EBRA and the presentation of a simple clinical grading system.

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• Optimal acetabular orientation for hip resurfacing.

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• Pelvis and total hip arthroplasty acetabular component orientations in sitting and standing positions: measurements reproductibility with EOS imaging system versus conventional radiographies.

  Lazennec JY, Rousseau MA, Rangel A, Gorin M, Belicourt C, Brusson A, Catonné Y. Lazennec JY, et al. Orthop Traumatol Surg Res. 2011 Jun;97(4):373-80. doi: 10.1016/j.otsr.2011.02.006. Epub 2011 May 12. Orthop Traumatol Surg Res. 2011. PMID: 21570378
• Insufficient acetabular version increases blood metal ion levels after metal-on-metal hip resurfacing.

  Hart AJ, Skinner JA, Henckel J, Sampson B, Gordon F. Hart AJ, et al. Clin Orthop Relat Res. 2011 Sep;469(9):2590-7. doi: 10.1007/s11999-011-1930-y. Epub 2011 Jun 9. Clin Orthop Relat Res. 2011. PMID: 21656317 Free PMC article.
• A new technique for radiographic measurement of acetabular cup orientation.

  Derbyshire B, Diggle PJ, Ingham CJ, Macnair R, Wimhurst J, Jones HW. Derbyshire B, et al. J Arthroplasty. 2014 Feb;29(2):369-72. doi: 10.1016/j.arth.2013.06.024. Epub 2013 Jul 27. J Arthroplasty. 2014. PMID: 23896357
• Functional acetabular component position with supine total hip replacement.

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• 2D measurements of cup orientation are less reliable than 3D measurements.

  Davda K, Smyth N, Cobb JP, Hart AJ. Davda K, et al. Acta Orthop. 2015;86(4):485-90. doi: 10.3109/17453674.2015.1017791. Epub 2015 Feb 12. Acta Orthop. 2015. PMID: 25674698 Free PMC article.