Does Severe Early Motor Deficit Define Recovery Ceiling After Basal Ganglia or Thalamic Hemorrhage?

Area of Science:

• Neuroscience
• Neurology
• Rehabilitation Medicine

Background:

• The extent of motor recovery after severe early motor deficit in deep intracerebral hemorrhage (ICH) remains unclear.
• It is debated whether this deficit represents a fixed recovery ceiling or a mix of reversible and structural factors.

Purpose of the Study:

• To synthesize time-dependent motor outcomes after basal ganglia or thalamic hemorrhage.
• To identify corticospinal tract-related predictors of motor recovery in deep ICH.

Main Methods:

• A systematic review and synthesis without meta-analysis was conducted following PRISMA 2020 guidelines.
• Searched multiple databases (PubMed, Embase, Web of Science, Scopus, Cochrane Library) for eligible studies.
• Classified studies into severe-deficit, broader, and predictor cohorts; assessed risk of bias using the Quality in Prognosis Studies tool.

Main Results:

• Twenty-five studies were included. Six severe-baseline cohorts showed meaningful six-month motor recovery, with faster gains in putaminal hemorrhage within four months.
• Approximately 53% of patients in broader cohorts achieved Functional Ambulation Category ≥4 at discharge.
• Corticospinal tract integrity, fractional anisotropy, lesion load, and posterior internal capsule involvement consistently predicted motor outcomes.

Conclusions:

• Severe early motor deficit after deep ICH does not preclude recovery.
• Recovery is anatomically limited by corticospinal tract and posterior internal capsule integrity.
• Prognostic counseling should incorporate acute imaging and the suggested four-month recovery window for severe putaminal hemorrhage.