In the published article, there was an error in Table 2 as published. The units of the Total body center of mass sway in x-axis (TBCMx) and y-axis (TBCMy) were shown in mm when they should be in cm. The corrected Table 2 and its caption appear below.
Table 2
| Gait parameter | 1. HC | 2. AC | 3. SP | 3.1 SPS | 3.2 SPSL | 3.3 SMP |
|---|---|---|---|---|---|---|
| Stride duration, s | 1.238 ± 0.386 | 1.463 ± 0.518 | 1.628 ± 0.690 | 1.709 ± 0.729 | 1.463 ± 0.509 | 1.616 ± 0.768 |
| Stride length, cm | 114.7 ± 23.0 | 101.5 ± 28.0 | 93.6 ± 25.5 | 92.8 ± 25.6 | 91.7 ± 23.7 | 100.2 ± 27.3 |
| Step duration, s | 0.626 ± 0.282 | 0.732 ± 0.343 | 0.823 ± 0.489 | 0.862 ± 0.517 | 0.744 ± 0.396 | 0.816 ± 0.513 |
| Step length, cm | 52.2 ± 13.5 | 47.3 ± 15.5 | 42.6 ± 15.6 | 42.6 ± 15.9 | 41.6 ± 15.3 | 44.7 ± 14.4 |
| Step width, cm | 12.4 ± 3.7 | 12.1 ± 3.8 | 13.0 ± 4.2 | 13.7 ± 4.4 | 12.1 ± 4.1 | 12.2 ± 3.2 |
| Stance duration, s | 0.784 ± 0.261 | 0.943 ± 0.396 | 1.012 ± 0.525 | 1.057 ± 0.559 | 0.901 ± 0.360 | 1.044 ± 0.608 |
| Swing duration, s | 0.455 ± 0.245 | 0.521 ± 0.301 | 0.616 ± 0.414 | 0.652 ± 0.451 | 0.562 ± 0.342 | 0.573 ± 0.367 |
| Single support duration, s | 0.897 ± 0.331 | 1.043 ± 0.451 | 1.219 ± 0.575 | 1.292 ± 0.623 | 1.104 ± 0.440 | 1.142 ± 0.559 |
| Double support duration, s | 0.341 ± 0.125 | 0.421 ± 0.172 | 0.409 ± 0.267 | 0.417 ± 0.296 | 0.359 ± 0.139 | 0.474 ± 0.309 |
| Gait speed, m/s | 1.047 ± 0.239 | 0.846 ± 0.228 | 0.728 ± 0.180 | 0.696 ± 0.161 | 0.767 ± 0.182 | 0.785 ± 0.218 |
| Gait speed variability, m/s | 0.105 ± 0.057 | 0.153 ± 0.384 | 0.121 ± 0.216 | 0.107 ± 0.119 | 0.125 ± 0.208 | 0.170 ± 0.423 |
| Foot swing velocity, m/s | 2.679 ± 1.031 | 2.318 ± 1.334 | 1.894 ± 1.109 | 1.807 ± 1.103 | 1.917 ± 0.917 | 2.195 ± 1.376 |
| Arm swing velocity, m/s | 1.976 ± 0.749 | 1.570 ± 0.798 | 1.384 ± 0.709 | 1.312 ± 0.515 | 1.405 ± 0.575 | 1.633 ± 1.299 |
| Total body center of mass sway in x-axis, cm | 29.2 ± 38.7 | 35.5 ± 26.1 | 34.1 ± 37.9 | 29.7 ± 33.1 | 44.7 ± 41.5 | 31.5 ± 44.2 |
| Total body center of mass sway in y-axis, cm | 10.2 ± 5.4 | 13.7 ± 15.5 | 11.1 ± 8.4 | 10.9 ± 7.5 | 11.6 ± 10.7 | 10.9 ± 7.0 |
| Neck angle, deg | 166.1 ± 10.2 | 162.3 ± 14.2 | 158.1 ± 17.7 | 160.4 ± 13.8 | 152.1 ± 23.5 | 160.2 ± 16.5 |
| Spine shoulder angle, deg | 171.3 ± 5.8 | 168.5 ± 8.7 | 165.7 ± 11.3 | 167.1 ± 8.9 | 161.9 ± 15.3 | 167.2 ± 9.4 |
| Spine middle angle, deg | 175.9 ± 2.2 | 174.7 ± 2.7 | 173.6 ± 3.3 | 173.8 ± 3.2 | 172.8 ± 3.6 | 173.9 ± 3.3 |
| Maximum elbow angle, deg | 167.6 ± 10.9 | 166.0 ± 9.7 | 166.0 ± 10.1 | 166.1 ± 9.3 | 166.5 ± 12.8 | 164.5 ± 6.2 |
| Minimum elbow angle, deg | 144.3 ± 20.4 | 144.7 ± 20.4 | 144.8 ± 21.8 | 145.3 ± 20.1 | 144.7 ± 26.0 | 142.6 ± 19.9 |
| Maximum knee angle, deg | 174.5 ± 3.1 | 176.8 ± 2.5 | 174.8 ± 3.5 | 174.5 ± 3.6 | 174.8 ± 3.4 | 176.1 ± 3.1 |
| Minimum knee angle, deg | 142.0 ± 17.7 | 142.5 ± 17.1 | 143.1 ± 18.4 | 142.6 ± 18.1 | 145.3 ± 17.7 | 141.1 ± 20.8 |
| Hip angle range, deg | 19.3 ± 7.0 | 18.9 ± 7.5 | 17.1 ± 6.8 | 17.3 ± 7.2 | 16.0 ± 5.8 | 18.4 ± 7.1 |
| Ankle angle range, deg | 33.6 ± 16.6 | 27.9 ± 17.6 | 20.7 ± 16.0 | 17.6 ± 14.2 | 22.0 ± 16.0 | 30.3 ± 18.4 |
Mean ± standard deviation values for each gait parameter and each subject group (1. Healthy Controls – HC; 2. Asymptomatic Carriers – AC; 3. Symptomatic Patients – SP; 3.1 Patients with small-fiber sensory polyneuropathy – SPS – and 3.2 with large-fiber sensory polyneuropathy – SPSL; and 3.3 Patients with motor neuropathy – SMP).
In the published article, there was an error in Table 3 as published. The units of the Total body center of mass sway in x-axis (TBCMx) and y-axis (TBCMy) were shown in mm. The correct unit is cm. The corrected Table 3 and its caption appear below.
Table 3
| Gait parameter | HC–AC | HC–SP | AC–SP | AC–SPS | SPS–SPSL | SPSL–SMP | HC–SMP |
|---|---|---|---|---|---|---|---|
| Stride duration, s | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 |
| Stride length, cm | 0.04 | ||||||
| Step duration, s | ≤ 0.001 | ||||||
| Step length, cm | |||||||
| Step width, cm | N.S. | N.S. | N.S. | ||||
| Stance duration, s | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ||||
| Swing duration, s | N.S. | ||||||
| Single support duration, s | |||||||
| Double support duration, s | ≤ 0.001 | ||||||
| Gait speed, m/s | N.S. | ||||||
| Gait speed variability, m/s | N.S. | ≤ 0.001 | |||||
| Foot swing velocity, m/s | ≤ 0.001 | 0.002 | |||||
| Arm swing velocity, m/s | ≤ 0.001 | ||||||
| Total body center of mass sway in x-axis (TBCMx), cm | 0.036 | ||||||
| Total body center of mass sway in y-axis (TBCMy), cm | N.S. | N.S. | N.S. | ||||
| Neck angle, deg | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ||||
| Spine shoulder angle, deg | |||||||
| Spine middle angle, deg | |||||||
| Maximum elbow angle, deg | N.S. | N.S. | |||||
| Minimum elbow angle, deg | N.S. | 0.009 | 0.038 | 0.003 | N.S. | ||
| Maximum knee angle, deg | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | 0.046 | ≤ 0.001 | ||
| Minimum knee angle, deg | 0.007 | N.S. | N.S. | 0.002 | 0.022 | N.S. | |
| Hip angle range, deg | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | |
| Ankle angle range, deg |
Results of the Conover-Iman test (p-value) pairwise comparison between the six groups included in Table 2 (HC, AC, SP, SPS, SPSL and SMP), for each gait parameter.
N.S. stands for non-significant (p-value > 0.05).
In the published article, there was an error in Figure 3 as published. The units of the Total body center of mass sway in x-axis were shown in mm in the vertical axis of the plot. The correct unit is cm. The corrected Figure 3 and its caption appear below.
Figure 3
Mean and standard deviation for each subject group, for the gait parameters that showed statistically significant differences in the Conover-Iman test (p ≤ 0.05) for all the comparisons, when comparing different pairwise comparison, included in Table III, between the six groups (HC, AC, SP, SPS, SPSL and SMP).
In the published article, there was an error in Supplementary Table S.I. The units of the Total body center of mass sway in x-axis (TBCMx) and y-axis (TBCMy) were shown in mm. The correct unit is cm. The correct material statement appears below.
Table S.I
| Gait parameter | HC-SPS | HC–SPSL | AC–SPSL | AC–SMP | SPS–SMP |
|---|---|---|---|---|---|
| Stride duration, s | ≤ 0.001 | ≤ 0.001 | N.S. | ≤ 0.001 | ≤ 0.001 |
| Stride length, cm | ≤ 0.001 | 0.003 | |||
| Step duration, s | N.S. | ≤ 0.001 | 0.005 | ||
| Step length, cm | ≤ 0.001 | N.S. | |||
| Step width, cm | N.S. | 0.035 | N.S. | ≤ 0.001 | |
| Stance duration, s | ≤ 0.001 | ≤ 0.001 | ≤ 0.001 | N.S. | |
| Swing duration, s | ≤ 0.001 | ||||
| Single support duration, s | |||||
| Double support duration, s | N.S. | ||||
| Gait speed, m/s | ≤ 0.001 | ||||
| Gait speed variability, m/s | N.S. | 0.009 | N.S. | ||
| Foot swing velocity, m/s | ≤ 0.001 | ≤ 0.001 | 0.021 | ||
| Arm swing velocity, m/s | N.S. | ||||
| Total body center of mass sway in x-axis (TBCMx), cm | 0.015 | ≤ 0.001 | |||
| Total body center of mass sway in y-axis (TBCMy), cm | ≤ 0.001 | N.S. | 0.023 | ||
| Neck angle, deg | N.S. | ≤ 0.001 | |||
| Spine shoulder angle, deg | 0.03 | N.S. | |||
| Spine middle angle, deg | 0.003 | ||||
| Maximum elbow angle, deg | N.S. | ≤ 0.001 | |||
| Minimum elbow angle, deg | ≤ 0.001 | 0.021 | ≤ 0.001 | ||
| Maximum knee angle, deg | 0.037 | ≤ 0.001 | |||
| Minimum knee angle, deg | 0.004 | N.S. | |||
| Hip angle range, deg | ≤ 0.001 | N.S. | |||
| Ankle angle range, deg | 0.025 | 0.01 |
Results of the Conover-Iman test (p-value) for the pairwise comparisons not presented in Table 3 between the six considered groups (HC, AC, SP, SPS, SPSL and SMP), for each gait parameter.
N.S. stands for non-significant (p-value > 0.05).
In the published article, there was a mistake on the computation description of one of the assessed parameters (total body center of mass). A correction has been made to “Data Processing,” Paragraph 3:
“For each gait cycle, we computed the 24 spatiotemporal and kinematic gait parameters listed in Table 2 and defined in (15). The total body center of mass (TBCM) sway was computed as the standard deviation of the distance (in the x/y-axis, i.e., medial-lateral and vertical directions) of the total body center of mass (TBCM), in relation to the RGB-D sensor's coordinate system, for all gait cycle frames. For each frame, TBCM's position is the mean position of all body segments' CM, which was obtained according to (21).”
The authors apologize for these errors and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
Publisher's note
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Summary
Keywords
ATTRv V30M, amyloidosis, polyneuropathy, gait, quantitative assessment, ambulatory, markerless vision-based systems
Citation
Vilas-Boas MdC, Rocha AP, Cardoso MN, Fernandes JM, Coelho T and Cunha JPS (2022) Corrigendum: Clinical 3-D gait assessment of patients with polyneuropathy associated with hereditary transthyretin amyloidosis. Front. Neurol. 13:980597. doi: 10.3389/fneur.2022.980597
Received
28 June 2022
Accepted
19 July 2022
Published
17 August 2022
Volume
13 - 2022
Edited by
Chiara Briani, University of Padua, Italy
Reviewed by
Valeria Prada, University of Genoa, Italy; Daniele Coraci, University of Padua, Italy
Updates
Copyright
© 2022 Vilas-Boas, Rocha, Cardoso, Fernandes, Coelho and Cunha.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: João Paulo Silva Cunha jpcunha@inesctec.pt
This article was submitted to Neuromuscular Disorders and Peripheral Neuropathies, a section of the journal Frontiers in Neurology
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.