Abstract
The treatment strategies are based on hypotheses about the aetiology of the pathology. These hypotheses remain unchanged, even if our treatment does not always bring the desired success. The cause of these less satisfactory results is often not investigated. New findings from modern literature can also go unnoticed for a long time. We should question our traditional concepts more often and be open to new and novel possibilities. As examples, we describe the treatment of hamstrings in squatting gait, femoral osteotomy in internal hip rotation during walking and the importance of spasticity. The problem of outdated working hypotheses also calls into question clinical evidence-based papers on outcome.