A paper evaluating the inter-rater and parallel forms reliability of the German version of the PEDro scale has recently been published. The reference is:
Moseley A, Costa LOP, Hegenscheidt S. Interrater- und Paralleltest-Reliabilität der deutschen Version der PEDro-Skala (Interrater and Parallel Forms Reliability of the German Version of the PEDro Scale). physioscience 2015 Dec;11(4):164-70
The interrater reliability of the German PEDro scale is adequate and similar to the original English version. The evidence for parallel forms reliability suggests the interchangeability of the English and German versions.