Automatic Measurement of Neutral Foot Posture Using Three-Dimensional Scanning
The Rearfoot Angle (RFA) is the most commonly method used for foot posture assessment, and it is also a method for evaluating the subtalar joint neutral foot posture. However, orthopedists and researchers often meet trouble for the measurements of the RFA and neutral foot posture due to lacking measurement with automation and objectivity. In general, the RFA was measured using a goniometer to align with manual markers on the foot. The purpose of this study implements the automatic computing of leg angle, foot angle, and RFA by the foot model using Three-Dimensional (3D) scanning. This study contributes to the algorithms to The purpose of this study implement the automatic and objective computing of leg angle, foot angle, and RFA by the foot model using 3D scanning. The automatic calculation on leg angle, foot angle, and neutral foot posture has been created, test, and validated completely in this study. There are two algorithm methods proposed to determine the midpoint on the leg or foot outline. The midline has been computed by linear regression through five midpoints. The leg and foot angles are calculated by the tibial and calcaneal midlines, respectively. Through the subject standing on eversion foot platforms, the neutral posture of the foot can be computed by the leg and foot angles determined by the 3D model scanned of the foot with various tilt angles. The determinations of the midpoint and midline have been demonstrated algorithm by MATLAB. Based on comparing with the goniometer measured, selecting the midpoint algorithm of the limit points and the lowest point methods to determine the tibial and calcaneal midlines respectively would carry out better results. The foot 3D scanning measurement proposed in this study has been tested and validated from the goniometer. This study can determine the leg angle, foot angle, and neutral foot postures for a subject with normal weight status, but be not suitable for that with obese weight status. In the future, this study can provide guidance for foot posture assessment and personal insoles design.
D. L. France, “Human and nonhuman bone identification: a color atlas,” CRC Press, 2008.
R. B. Brewer and A. J. Gregory, “Ghronic lower leg pain in athletes: a guide for the differential diagnosis, evaluation, and treatment,” Sports Health, vol. 4, no. 2, pp. 121-127, 2012.
S. R. Jonson and M. T. Gross, “Intraexaminer reliability, interexaminer reliability and mean values for nine lower extremity skeletal measures in healthy naval midshipmen,” J. Orthop. Sports Phys. Ther., vol. 25, no. 4, pp. 253-263, 1997.
J. M. Genova and M. T. Gross, “Effect of foot orthotics on calcaneal eversion during standing and treadmill walking for subjects with abnormal pronation,” J. Orthop. Sports Phys. Ther., vol. 30, no. 11, pp. 664-675, 2000.
B. Langley, M. Cramp, and S. C. Morrison, “Clinical measures of static foot posture do not agree,” J. Foot Ankle Res., vol. 9, no. 1, pp. 45-1-6, 2016.
A. P. Ribeiro, F. Trombini-Souza, V. Tessutti, F. R. Lima, I. C. N. Sacco, and S. M. A. João, “Rearfoot alignment and medial longitudinal arch configurations of runners with symptoms and histories of plantar fasciitis,” Clin., vol. 66, no. 6, pp. 1027-1033, 2011.
L. D. M. Mendonça, N. F. N. Bittencourt, G. M. Amaral, L. S. Diniz, T. R. Souza, and S. T. Fonseca, “A quick and reliable procedure for assessing foot alignment in athletes,” J. Am. Podiatr. Med. Assoc., vol.103, no. 5, pp. 405-410, 2013.
R. G. Nielsen, M. S. Rathleff, O. H. Simonsen, and H. Langberg, “Determination of normal values for navicular drop during walking: a new model correcting for foot length and gender,” J. Foot Ankle Res., vol. 2, pp. 1-12, 2009.
H. B. Menz, M. R. Fotoohabadi, E. Wee, and M. J. Spink, “Visual categorisation of the arch index: a simplified measure of foot posture in older people,” J. Foot Ankle Res., vol. 5, no. 10, pp. 1-7, 2012.
R. W. Mendicino, A. R. Catanzariti, S. John, B. Child, and B. M. Lamm, “Long leg calcaneal axial and hindfoot alignment radiographic views for frontal plane assessment,” J. Am. Podiatr. Med. Assoc., vol. 98, no. 1, pp. 75-78, 2008.
B. M. Lamm, R. W. Mendicino, A. R. Catanzariti, and H. J. Hillstrom, “Static rearfoot alignment,” J. Am. Podiatr. Med. Assoc., vol. 95, no. 1, pp. 26-33, 2005.
Y. X. Chen, G. R. Yu, J. Mei, J. Q. Zhou, and W. Wang, “Assessment of subtalar joint neutral position: a cadaveric study,” Chin. Med. J., vol. 121, no. 8, pp. 735-739, 2008.
C. H. Lin, C. C. Yeh, and Z. H. Qiu, “Assessment of subtalar joint neutral position: study of image processing for rear foot image,” Proceedings of the World Congress on Engineering, July 5-7, London, vol. II, pp. 3-7, 2017.
H. Mukhtar, D. Rahmawati, D. K. Silalahi, L. Novamizanti, M. R. Ghifari, A. A. A. Dzikri, F. F. Rachman, and A. A. Khatami “Fast algorithm to measure the types of foot postures with anthropometric tests using image processing”, Indones. J. Electr. Eng. Comput. Sci., vol. 2, no. 1, pp. 48-59, 2020.
C. H. Lin, Z. H. Qiu, and C. C. Yeh, "Image processing for rear foot image evaluating leg and foot angles," Measurement, vol. 126, pp. 168-183, 2018.
Y. Dessery, J. Pallari “Correction: Measurements agreement between low-cost and high-level handheld 3D scanners to scan the knee for designing a 3D printed knee brace,” PLoS One, vol. 13, no. 4, pp. e0196183-1-14, 2018.
L. Hale, E. Linley, and D. M. Kalaskar, “A digital workflow for design and fabrication of bespoke orthoses using 3D scanning and 3D printing a patient-based case study,” Sci. Rep., vol. 10, pp. 7028, 2020.
H. K. Banga, P. Kalra, R. M. Belokar, and R. Kumar, “Scanning and rapid prototyping of foot drop patient's leg,” 14th International Conference on Humanizing Work and Work Environment, 2016.
Y. H. Cha, K. H. Lee, H. J. Ryu, I. W. Joo, A. Seo, D. H. Kim, and S. J. Kim, “Ankle-foot orthosis made by 3D printing technique and automated design software,” Appl. Bionics. Biomech., vol. , no. , pp., 2017.
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