Goal of this study is to develop and evaluate a physiotherapy concept that is focused on bilateral leg spasticity and aims to reduce spastic gait disturbance and to improve mobility in patients suffering from HSP.

This is a randomized single-center parallel study with a control group design. A blinded block randomization in groups of four was performed in equal parts toward the treatment (TPC) or the control (regular standard-of-care) group using randomization.com. Group assignment was kept in a closed envelope which was opened by the participant at the end of the baseline visit. Therefore both, the movement disorder specialist as well as the physiotherapist, were blinded to the randomization result for the baseline assessment up to the beginning of the first physiotherapy training session.

Therapeutic effects were evaluated at follow-up visits after 12 weeks (first visit, short-term effect) and after 26 weeks (second visit, long-term effect) comparing standard-of care with the TPC. Clinical evaluation is stated in detail below. Primary outcome assessment of this study was the change between baseline and follow-up assessment in treatment to control group in the spastic paraplegia rating scale (SPRS) score as a validated measure of disease severity (see Reference). Secondary outcome assessment was the change in walking distance in the Three-Minute-Walking test (3MW). Further exploratory outcome assessments were evaluated as effect sizes as specified below.

Inclusion Criteria:

• clinical diagnosis of hereditary spastic paraplegia
• manifest spastic gait disturbance
• remaining walking ability of at least 100m in three minutes,
• no botulinum toxin treatment during the entire study and three months prior to study inclusion
• no functional electronic stimulation during the study period.

Exclusion Criteria:

• see above

Available upon request

Masking only for baseline visit.