Wei Wei Jiang1,2, Connie Lok Kan Cheng2, Jason Pui Yin Cheung3,4, Dino Samartzis3,4, Kelly Ka Lee Lai2, Michael Kai Tsun To5,6, Yong Ping Zheng7. 1. College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou, China. 2. Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China. 3. Department of Orthopaedics and Traumatology, HKU Shenzhen Hospital, Shenzhen, Guangdong, China. 4. The Duchess of Kent Children's Hospital, The University of Hong Kong, Pokfulam, Hong Kong SAR, China. 5. Department of Orthopaedics and Traumatology, HKU Shenzhen Hospital, Shenzhen, Guangdong, China. mikektto@hku.hk. 6. The Duchess of Kent Children's Hospital, The University of Hong Kong, Pokfulam, Hong Kong SAR, China. mikektto@hku.hk. 7. Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China. ypzheng@ieee.org.
Abstract
PURPOSE: The Adam's forward bending test is the most commonly used approach to assess the spine deformity in adolescent idiopathic scoliosis (AIS) patients. However, there are noticeable differences in the hump appearance from standing to forward bending. This phenomenon has yet to be understood due to limitations of conventional radiographs. This study aimed to investigate effects of postural change in the spine deformity in the coronal plane of AIS patients using a 3D ultrasound imaging system. METHODS: This was a prospective study that recruited 72 AIS patients at a single institute. All patients were scanned twice in the sitting and sitting forward bending postures. A coronal ultrasound image showing the spinal curvature was generated after each scan and the spinous process angle (SPA) representing the deformity was manually measured from it. Correlation of SPAs under sitting and sitting forward bending postures was analyzed. RESULTS: In the comparison test, it was noted that there were three types of spine profile alternation after the postural change. In types I and II, the SPA angle numbers were the same before and after forward bending and only SPA values changed. In type III, the two curvatures were changed to one curvature in the forward bending posture. Moderate correlation was observed between the angles obtained in the two postures (r = 0.55, p < 0.001). CONCLUSIONS: Spine deformities of AIS patients vary with different postures. The patterns of changes in sitting and sitting forward bending postures are highly subject dependent. These slides can be retrieved under Electronic Supplementary Material.
PURPOSE: The Adam's forward bending test is the most commonly used approach to assess the spine deformity in adolescent idiopathic scoliosis (AIS) patients. However, there are noticeable differences in the hump appearance from standing to forward bending. This phenomenon has yet to be understood due to limitations of conventional radiographs. This study aimed to investigate effects of postural change in the spine deformity in the coronal plane of AISpatients using a 3D ultrasound imaging system. METHODS: This was a prospective study that recruited 72 AISpatients at a single institute. All patients were scanned twice in the sitting and sitting forward bending postures. A coronal ultrasound image showing the spinal curvature was generated after each scan and the spinous process angle (SPA) representing the deformity was manually measured from it. Correlation of SPAs under sitting and sitting forward bending postures was analyzed. RESULTS: In the comparison test, it was noted that there were three types of spine profile alternation after the postural change. In types I and II, the SPA angle numbers were the same before and after forward bending and only SPA values changed. In type III, the two curvatures were changed to one curvature in the forward bending posture. Moderate correlation was observed between the angles obtained in the two postures (r = 0.55, p < 0.001). CONCLUSIONS: Spine deformities of AISpatients vary with different postures. The patterns of changes in sitting and sitting forward bending postures are highly subject dependent. These slides can be retrieved under Electronic Supplementary Material.
Entities:
Keywords:
3D ultrasound; AIS; Forward bending; Scoliosis; Trunk posture
Authors: C F Lee; Daniel Y T Fong; Kenneth M C Cheung; Jack C Y Cheng; Bobby K W Ng; T P Lam; K H Mak; Paul S F Yip; Keith D K Luk Journal: Spine (Phila Pa 1976) Date: 2010-12-01 Impact factor: 3.468
Authors: Dino Samartzis; Yee Leung; Hideki Shigematsu; Deepa Natarajan; Oliver Stokes; Kin-Cheung Mak; Guanfeng Yao; Keith D K Luk; Kenneth M C Cheung Journal: PLoS One Date: 2015-08-13 Impact factor: 3.240