After a stroke, many people experience difficulty using both hands together in daily life. Most rehabilitation assessments, however, only measure how the affected arm performs in one-handed tasks. This makes it difficult to understand how well people actually use their hands in real-world activities, which are usually bimanual.

The Adult Assisting Hand Assessment - Stroke version (Ad-AHA Stroke) is a new clinical test that evaluates how the affected hand performs during two-handed tasks. While promising, it is still unknown whether the score on this test truly reflects how stroke survivors use their hands in daily life.

This study aims to investigate this question by comparing Ad-AHA Stroke scores with real-life data on hand use, recorded over three days using wrist-worn sensors on both arms. By combining clinical and sensor-based measures, this study will help determine whether the Ad-AHA Stroke can accurately represent everyday bimanual performance after stroke.

This is a single-center, cross-sectional observational study designed to examine the relationship between Ad-AHA Stroke scores and real-life bimanual hand use derived from accelerometry data in chronic stroke survivors.

Inclusion Criteria:

• Written informed consent obtained prior to any study procedures.
• Age between 18 and 80 years (inclusive).
• Unilateral supratentorial stroke involving cortical or subcortical structures.
• At least 6 months post-stroke at the time of inclusion.
• Community-dwelling (discharged from hospital and currently living at home).
• Able and willing to wear bilateral wrist-worn sensors (triaxial accelerometers) for three consecutive days.
• Presence of clinically observable bimanual impairment.

Exclusion Criteria:

• Severe upper limb impairment, defined as a Fugl-Meyer Assessment of Upper Extremity (FMA-UE) score ≤ 15.
• Severe cognitive or language comprehension impairment interfering with understanding of study instructions or task performance, as judged during screening.
• Presence of other neurological or orthopedic conditions affecting upper limb function (e.g., Parkinson's disease, multiple sclerosis, severe osteoarthritis, brachial plexus injury).

Study participants will be adults with chronic stroke (≥ 6 months post-onset) who have observable difficulties in performing bimanual tasks. Participants will be recruited from KU Leuven's rehabilitation network, including university-affiliated rehabilitation centers and outpatient clinics in the Leuven region. All participants will be community-dwelling and medically stable at the time of inclusion.