In the article by Pritchard et al in the January 2012 issue of Arthritis Care & Research (pages 83–91) the following errors were detected. In the “Image analysis” section on page 85, the model-independent method was used to estimate Tb.Th, Tb.Sp, and Tb.N. In Table 2, Daily energy expenditure should be measured in kcal/week. Reference 35 should be Hildebrand T, Ruegsegger P. A new method for the model-independent assessment of thickness in three-dimensional images. J Microsc 1997;185:67–75.

We regret the errors.