Inclusion Criteria:  diagnosed with tuberous sclerosis complex according to the criteria of Northrup et al. (2012) aged 6 years or older being able to walk without aids for a minimum distance of 6 meters  Exclusion Criteria:  severe epileptic seizure (status epilepticus or tonic-clonic insult over 3 min) within the 24 hours before the assessment insufficient cooperation to perform 3D gait analysis