Erratum to: Assessing reproducibility for radiographic measurement of leg length inequality after total hip replacement, Hip Int. 2012 Sep-Oct;22(5):539-544.

Erratum to: Hip Int. 2012 Sep-Oct;22(5):539-544. Assessing reproducibility for radiographic measurement of leg length inequality after total hip replacement. McWilliams AB, Grainger AJ, O'Connor PJ, Redmond AC, Stewart TD, Stone MH. PMID: 23100154 DOI:10.5301/HIP.2012.9751 [PubMed - indexed for MEDLINE] In the article "Assessing reproducibility for radiographic measurement of leg length inequality after total hip replacement", by Anthony B. McWilliams, Andrew J. Grainger, Philip J. O'Connor, Anthony C. Redmond, Todd D. Stewart, Martin H. Stone, published in Hip International 2012; 22 (5): 539-544, there is an error in the labelling of Figure 4. The radiograph of the CFR-T-LT method is incorrectly labelled. The S (or stem) measurement and the O (or overall) measurement should be switched. The text in the caption is corrected below. This is an error in labelling and makes no difference to the results of the study; the measurements and methodology remain unchanged and the authors stand by the results. Fig. 4 - The CFR-T-LT Method. An initial reference line is drawn between the centres of femoral rotation. Two further lines are drawn parallel to this. The first at the level of the most inferior part of the acetabular teardrop to give measurement C, which corresponds to any inequality (CA-CN) due to the position of the cup. The second is at the level of the centre of the lesser trochanter to give measurement S, which corresponds to inequality (SA-SN) due to position of the stem. The measurement between these two additional lines is the overall LLI, (OA-ON).