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Subjective postural vertical in Parkinson's disease with lateral trunk flexion
Author(s) -
Mikami Kyohei,
Shiraishi Makoto,
Kamo Tsutomu
Publication year - 2020
Publication title -
acta neurologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.967
H-Index - 95
eISSN - 1600-0404
pISSN - 0001-6314
DOI - 10.1111/ane.13285
Subject(s) - coronal plane , trunk , medicine , parkinson's disease , psychology , disease , anatomy , biology , ecology
Background Patients with Parkinson's disease (PD) and associated lateral trunk flexion (LTF) cannot accurately perceive their own verticality. Objective We measured the subjective postural vertical in coronal plane (SPVc) angle on patients' ipsilateral and contralateral sides and combined to clarify the effects of SPVc on LTF. We also investigated effects of the SPVc angle on LTF severity. Methods Thirty‐nine patients (aged 74.1 ± 7.6 years) were divided between those with mild LTF (LTF angle < 10°, n = 34) and those with moderate to severe LTF (LTF angle ≥ 10°, n = 5) for comparison of the LTF angle, SPVc angle on both sides, inter‐measurement variation in the SPVc angle, and the LTF to SPVc angle ratio (SPVc ratio). Results We found significant positive correlation between LTF and the SPVc angle on the combined ( r = .54, P = .001), ipsilateral ( r = .51, P = .002), and contralateral ( r = .50, P = .002) sides. We found significant negative correlation between the LTF angle and the SPVc ratio on the combined SPVc ( r = −.82, P = .001), ipsilateral ( r = −.69, P = .001), and contralateral ( r = −.75, P = .001) sides and between the LTF and ipsilateral side coefficient of variation ( r = −.34, P = .038). SPVc angles on ipsilateral and contralateral sides were significantly greater in cases of moderate to severe LTF than in cases of mild LTF ( P < .01). Conclusions Subjective postural vertical in coronal plane assessment may be useful for assessing patients with PD and associated LTF.