Dear Editor,
We totally agree with the statement of the authors of the letter to the editor that “the incidence of CRPS knee following trauma or otherwise is not well appreciated.”We would like to refer to our earlier published paper in which we concluded that the scientific literature does report cases of complex regional pain syndrome (CRPS) type I of only the knee(s). Our recommendation was to consider CRPS confined to the knee as a medical entity and therefore to include CRPS of only the knee(s) in future research on the etiological mechanisms of and optimal treatment for CRPS. [...]