Topics in stroke rehabilitation · 2026
Reduced contralateral center of pressure displacement during lateral weight-shifting in patients with lateropulsion after acute brainstem infarction.
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Inoue Taisei, Matsuo Hideaki, Watanabe Hiraku, Matsumura Mayumi, Kotani Soa, Ikawa Masamichi, Arishima Hidetaka, Kubota Masafumi
Аннотация
BACKGROUND: The center of pressure (COP) position in lateropulsion cases has been reported to deviate toward the lateropulsion side and then shift toward the non-lateropulsion side during recovery. However, research on dynamic postural control in patients with lateropulsion is limited, and the kinematic characteristics remain unclear.
OBJECTIVE: To investigate the characteristics of dynamic postural control in patients with lateropulsion following acute brainstem infarction by comparing COP displacement during a lateral weight-shifting task.
METHODS: This retrospective cross-sectional study included twenty patients diagnosed with lateropulsion after brainstem infarction. Patients were classified into mild (Grades I - II, n = 8) and severe (Grades III - IV, n = 12) lateropulsion groups based on the Grading of Lateropulsion. The main outcomes were maximum lateral COP displacement on the lateropulsion and non-lateropulsion sides during a 30-s lateral weight-shifting task. The COP symmetry index was calculated as follows: [(lateropulsion - non-lateropulsion)/(lateropulsion + non-lateropulsion)] × 100. Balance was evaluated using the Berg Balance Scale (BBS).
RESULTS: In all participants, non-lateropulsion side COP displacement was significantly smaller than lateropulsion side displacement (lateropulsion: 8.4 ± 2.8 cm, non-lateropulsion: 6.0 ± 3.4 cm; p = 0.007, d = 0.770). The severe lateropulsion group showed greater COP symmetry index values (32.7 ± 29.7% vs. 0.6 ± 31.2%, p = 0.031, d = 1.050) and significantly lower BBS scores (24.1 ± 9.5 vs. 43.3 ± 10.2, p < 0.001, d = 2.020) than those of the mild lateropulsion group.
CONCLUSIONS: Among patients with lateropulsion after acute brainstem infarction, COP displacement toward the non-lateropulsion side was smaller than that toward the lateropulsion side during a dynamic standing task, with greater asymmetry in patients with more severe lateropulsion.
OBJECTIVE: To investigate the characteristics of dynamic postural control in patients with lateropulsion following acute brainstem infarction by comparing COP displacement during a lateral weight-shifting task.
METHODS: This retrospective cross-sectional study included twenty patients diagnosed with lateropulsion after brainstem infarction. Patients were classified into mild (Grades I - II, n = 8) and severe (Grades III - IV, n = 12) lateropulsion groups based on the Grading of Lateropulsion. The main outcomes were maximum lateral COP displacement on the lateropulsion and non-lateropulsion sides during a 30-s lateral weight-shifting task. The COP symmetry index was calculated as follows: [(lateropulsion - non-lateropulsion)/(lateropulsion + non-lateropulsion)] × 100. Balance was evaluated using the Berg Balance Scale (BBS).
RESULTS: In all participants, non-lateropulsion side COP displacement was significantly smaller than lateropulsion side displacement (lateropulsion: 8.4 ± 2.8 cm, non-lateropulsion: 6.0 ± 3.4 cm; p = 0.007, d = 0.770). The severe lateropulsion group showed greater COP symmetry index values (32.7 ± 29.7% vs. 0.6 ± 31.2%, p = 0.031, d = 1.050) and significantly lower BBS scores (24.1 ± 9.5 vs. 43.3 ± 10.2, p < 0.001, d = 2.020) than those of the mild lateropulsion group.
CONCLUSIONS: Among patients with lateropulsion after acute brainstem infarction, COP displacement toward the non-lateropulsion side was smaller than that toward the lateropulsion side during a dynamic standing task, with greater asymmetry in patients with more severe lateropulsion.