| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Hereditary Spastic Paraplegia |  
| Hereditaire Spastische Paraplegie |  | 
| E.1.1.1 | Medical condition in easily understood language |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Nervous System Diseases [C10] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| The primary objectives of this study is to investigate whether BTX injections, injected bilaterally in the spastic adductors of patients with HSP can improve lateral stepping and gait width. |  
| De primaire doelstelling van deze studie is te onderzoeken of BTX injecties, bilateraal geïnjecteerd in de spastische adductoren van HSP patiënten, lateraal stappen en de loopbreedte kan verbeteren. |  | 
| E.2.2 | Secondary objectives of the trial | 
| The secondary objectives are balance confidence, Berg Balance Scale, comfortable and maximum overground gait velocity, 6-Min Walk Test, Timed Up and Go test and gait adaptability. |  
| The secundaire doelstellingen zijn de balans tevredenheid, Berg Balans Schaal, comfortabele en maximale loopsnelheid, 6-Min Loop Test, Time Up and Go test en aanpassingsvermogen tijdens lopen. |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| -diagnosis of pure HSP based on molecular diagnosis (e.g. SPG-4 mutations) or based on inheritance -age at least 18 years
 -suffer from (bilateral) hip adductor spasticity without contracture (modified Ashworth scale score 1-4)
 -being a minimally independent household ambulator without walking aid (Functional Ambulation Categories 4-5)
 -gait velocity > 0.4 m/s
 -complain of balance problems due to a narrow base of support or problems with lateral stepping
 
 |  
| -diagnose van pure HSP gebaseerd op moleculaire diagnose (bijv. SPG-4) of op basis van erfelijkheid -minimaal 18 jaar
 -Lijden aan (bilaterale) heup adductor spasticiteit zonder contractuur (modified Ashworth scale score 1-4)
 -minimaal onafhankelijke lopers in bekende omgeving zonder hulpmiddelen (Functional Ambulation Categories 4-5)
 -Loopsnelheid > 0.4 m/s
 -Klachten over balansproblemen door te kleine standbreedte of problemen met zijwaarts stappen
 |  | 
| E.4 | Principal exclusion criteria | 
| -Last BTX treatment of the hip adductors is shorter than 6 months ago or when a next BTX treatment of these muscles cannot be postponed for 4 months without increasing fall risk or jeopardizing patients’ safety in any other way. -Any previous BTX injections in the calf muscles are accepted, but it must be possible to safely postpone subsequent injections of these muscles for 4 months after inclusion
 -Insufficient vision
 -Insufficient cardiopulmonary endurance
 -Insufficient sensorimotor abilities
 
 |  
| -Laatste BTX behandeling van de heup adductoren korter dan 6 maanden geleden of wanneer een BTX behandeling van deze spieren niet uitgesteld kan worden naar 4 maanden na inclusie zonder het risico van vallen te vergroten of de patiënt op enige andere wijze in gevaar te brengen -Voorgaande BTX injecties in kuitspieren worden geaccepteerd, maar het moet mogelijk zijn deze veilig uit te stellen naar 4 maanden na inclusie.
 -Onvoldoende visie
 -Onvoldoende cardiopulmonaal uithoudingsvermogen
 -Onvoldoende sensorimotorische capaciteiten
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Increased succesratio of recovering balance by a lateral step. Increased frontal leg angle. Increased gait width |  
| Verhoogde succes-ratio in balanshandhaving door een zijwaartse stap. Verhoogde frontale beenhoek. Verbeterde loopbreedte |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| before, 6 weeks and 16 weeks after the injection |  
| voor, 6 en 16 weken na de injectie |  | 
| E.5.2 | Secondary end point(s) | 
| Increased balance confidence, gait velocity and gait adaptability |  
| Verhoogde balans tevredenheid, loopsnelheid en aanpassingsvermogen tijdens het lopen. |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| before, 6 weeks and 16 weeks after the injection |  
| voor, 6 en 16 weken na de injectie |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | No | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | Yes | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | No | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | Yes | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | Yes | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | Yes | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years |  | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |