Correction

Selfe J, Callaghan M, Witvrouw E, et al. Targeted interventions for patellofemoral pain syndrome (TIPPS): classification of clinical subgroups. BMJ Open 2013;3:e003795. Figure 1 of this article was published incorrectly. The correct figure 1 is below.

Figure 1.

Proposed clinical sub-groups and clinical test thresholds for sub-group assignment.