Abstract
In a retrospective study we tested our hypothesis that the subjective postural vertical ratio (SPV ratio), i.e., the subjective postural vertical measured in relation to the lateral flexion axis, is predictive of lateral trunk flexion in patients with Parkinson's disease (PD). Twenty-five patients were included. The SPV angle, i.e., the subjective perception of a vertical position with reference to the vertical axis, and the SPV ratio, i.e., the SPV angle with reference to the axis of lateral flexion, were calculated. The SPV ratio (r = 0.698, P = 0.001) and LTF angle (r = − 0.601, P = 0.001) correlated with change in the LTF angle at 1 year. The SPV ratio was significantly smaller in patients for whom lateral trunk flexion improved (n = 12) than in those for whom it did not improve (n = 13) (0.99 ± 0.78 vs 1.66 ± 0.71, P = 0.011). The AUC under the ROC curve of the SPV ratio for discrimination of improvement was 0.795 (95% confidence interval: 0.61–0.98). We found that the SPV ratio is associated with change in the LTF and that it can conceivably be used to predict the likelihood of improvement in PD-associated lateral trunk flexion.
Highlights
In a retrospective study we tested our hypothesis that the subjective postural vertical ratio (SPV ratio), i.e., the subjective postural vertical measured in relation to the lateral flexion axis, is predictive of lateral trunk flexion in patients with Parkinson’s disease (PD)
A postural abnormality characterized by lateral deviation of the spine and the corresponding tendency to lean to one side, is common in patients with Parkinson’s disease (PD), with its prevalence, including that of mild lateral flexion, reported to exceed 40% among patients with PD of Hoehn and Yahr stages 1–4 and to exceed 80% among patients with PD of stage 41
Positive correlation was found between change in the LTF angle observed at 1 year and the baseline SPV ratio (r = 0.698, P = 0.001 (Fig. 1b), and negative correlation was found between change in the LTF angle and the baseline LTF angle (r = − 0.601, P = 0.001)
Summary
In a retrospective study we tested our hypothesis that the subjective postural vertical ratio (SPV ratio), i.e., the subjective postural vertical measured in relation to the lateral flexion axis, is predictive of lateral trunk flexion in patients with Parkinson’s disease (PD). We found that the SPV ratio is associated with change in the LTF and that it can conceivably be used to predict the likelihood of improvement in PD-associated lateral trunk flexion. The lateral trunk flexion itself requires treatment because it and other postural abnormalities associated with PD are not responsive to antiparkinson drugs typically administered to patients with P D6. We conducted a retrospective study in which we investigated the effect of the lateral subjective vertical on the course of lateral trunk flexion of patients who underwent rehabilitation therapy at regular intervals
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