accounts in particular for those subtests of the MLS that have to be done with both hands simultaneously. We therefore assume that it is possible to use the MLS as a tool to predict the ability to partially weight bear. Before clinical use threshold values for the subtests have to be determined with more patients. Since the MLS is a test that can be performed very easily, clinical use to predict the ability to comply with the prescribed load is realistic. Competing interests The authors declare that they have no competing interests. Authors' contributions TR participated in the study design, carried out all measurements, participated in the statistical analysis and drafted the manuscript. GO revised the statistical analysis and the manuscript. MZ participated in the study design and assisted in the measurements. PF participated in the study design and assisted in the measurements. CW conceived of the study and participated in its design, participated in the statistical analysis and helped to draft the manuscript. All authors read and approved the final manuscript.