NCT06767631RecruitingPhase 4
Pilot Study on Muscle, Tendon, and Neural Changes Post-Botulinum Toxin Injections in Post-stroke Spastic Equinovarus
Exploratory, Longitudinal Study to Define Changes in Muscle, Tendon and Neural Properties After Botuline Neurotoxin Type A (BoNT) Treatment of Spastic Equinovarus in First-ever Stroke Patients: a Pilot Study.
Source: ClinicalTrials.gov · Last updated 29 Apr 2026
Brief summary (registry, in English)
Poststroke spasticity significantly impairs function, particularly through the development of pes equinovarus. Botulinum toxin A (BoNT) injections into the medial gastrocnemius (MG) are a first-line treatment. Treatment outcomes and long-term responses to interventions can vary significantly between individual patients. Additionally, there is increasing concern about potential adverse effects on muscle morphology. Further research is essential to optimize treatment strategies and improve long-term outcomes in this population. Three-dimensional freehand ultrasound (3DfUS) and instrumented spasticity assessment (ISA) are two recently developed techniques that enable the evaluation of changes in muscle, tendon, and neural properties following BoNT injections for post-stroke spastic equinovarus. These methods hold promise for providing new insights into treatment effects. Before implementing these techniques in large-scale studies, a pilot study is required for accurate sample size calculations for a prospective observational study. This study includes a protocol for a non-blinded, non-randomized open-label longitudinal pilot study. The study was approved by the European Medicines Agency ( EU CT Number 2024-513158-32) by the University Hospitals Leuven ethical committee (ID S68672). Standard deviations and effect sizes of outcome measures obtained longitudinally with 3DfUS and ISA before and after BoNT injection into MG will inform sample size calculations for future research.
- Status (registry)
- Recruiting
- Phase (registry)
- Phase 4
- Study type
- Interventional
- Enrollment
- 12 (estimated)
- First submitted
- 27 Dec 2024
- Start date
- 2 May 2025
- Primary completion date
- 31 May 2027
- Lead sponsor
- Universitaire Ziekenhuizen KU Leuven
- Diseases
- Stroke
- NCT number
- NCT06767631
- EU CT number
- 2024-513158-32-01
What you commit to
- Study type: Interventional · Phase 4
- Planned participants: 12
- From 2 May 2025 to the primary completion date, 31 May 2027
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- The effect of botulinum toxin A can theoretically be potentiated by agents affecting neuromuscular transmission, such as aminoglycoside antibiotics (e.g., gentamicin, tobramycin), lithium salts, cholinesterase inhibitors and tubocurarine-like muscle relaxants ((cis)atracurium, rocuronium, suxamethonium, vecuronium). Therefore, patients on whom these medications are started during the course of the trail will be excluded.
Other
- Musculoskeletal or other neurological problems affecting the lower limb
- Presence of spinal cord pathology that could lead to spasticity, ataxia, dystonia
- Cognitive problems that impede measurements
- Severe co-morbidities
- Irritated skin or open wounds where ultrasound will be placed
- Pregnancy
- Profound atrophy of the muscles in the target area(s) of injection
- Participation in an interventional Trial with an investigational medicinal product (IMP) or device
Who the study is looking for
- Voluntary written informed consent of the participant or their legally authorized representative has been obtained prior to any screening procedures
- 2\. At least 18 years of age at the time of signing the Informed Consent Form (ICF)
- 3\. Use of highly effective methods of birth control; defined as those that, alone or in combination, result in low failure rate (i.e., less than 1% per year) when used consistently and correctly; such as implants, injectables, combined oral contraceptives, some IUDs, true sexual abstinence (i.e. refraining from heterosexual intercourse during the entire period of risk associated with the Trial treatment(s)) or commitment to a vasectomised partner.
- 4\. Pes equinovarus due to spasticity
- 5\. Clinical need for BoNT injection at the lower leg
- 6\. Any previous injection of BoNT into the muscles to be investigated was at least 3 months ago
- 7\. First-ever, unilateral stroke
Age in the registry: 40 years to 60 years · Sex: All · Does not accept healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| UZ Leuven Coordinator of this site? Confirm its status | Leuven | Belgium | Recruiting |
This page is information, not medical advice. Discuss any trial with your doctor.