Assessment of Maximum Spinal Deformity in Scoliosis: A Literature Review
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REVIEW ARTICLE
Assessment of Maximum Spinal Deformity in Scoliosis: A Literature Review Hui‑Dong Wu1,2,3 · Man‑Sang Wong1 Received: 4 July 2019 / Accepted: 23 July 2020 © Taiwanese Society of Biomedical Engineering 2020
Abstract Purpose The plane of maximum curvature (PMC), end-apical-end vertebrae plane (EAEP), and best-fit plane (BFP) have been used to describe the three-dimensional (3D) features of scoliosis but no thorough analyses were conducted. This study aimed to systematically review these descriptors about their potential differences, measurement techniques, and applications in scoliosis. Methods Articles were retrieved from six databases and Google Scholar search engine using the keywords “maximum spinal deformity” and “scoliosis” combined with “And”. Results BFP was found superior to EAEP and PMC in describing the 3D features of scoliosis; however, whether this advantage changes when BFP or EAEP orientation is simplified remains unknown. With the development of 3D reconstruction technique, radiographs and ultrasound images can be used to estimate maximum spinal deformity. The three descriptors have been applied in 3D assessment, progression monitoring, and classification of scoliosis, as well as evaluation of orthotic and surgical treatments but are rarely considered in major clinical decision-making. Conclusion More evidence is needed to support the superiority of PMC and simplified EAE and BFP, the accuracy of radiographic and ultrasound techniques, and the application of these descriptors to clinical decision-making. Further studies are deserved. Keywords Scoliosis · Maximum deformity · Plane of maximum curvature · End-apical-end vertebrae plane · Best-fit plane
1 Introduction Scoliosis is a complicated three-dimensional (3D) deformity of the spine characterized by lateral curve and axial vertebral rotation (AVR), and the spine may be shifted/rotated from the sagittal plane to other anatomical planes. The coronal Cobb angle measured from the posteroanterior (PA) radiograph is commonly used to assess scoliosis [1–3] but may underestimate the severity of the spinal curve and may not fully reflect the curve type [4–7]. Some 3D descriptors were * Man‑Sang Wong [email protected] 1
Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
2
Rehabilitation Medicine Center, West China Hospital, Sichuan University, Chengdu, China
3
Institute for Disaster Management and Reconstruction, Sichuan University-Hong Kong Polytechnic University, Chengdu, China
proposed to illustrate the maximum spinal deformity, including the plane of maximum curvature (PMC), end-apicalend vertebrae plane (EAEP), and best-fit plane (BFP), which have been considered important in the 3D assessment of scoliosis [8] and have been increasingly recognized in the orthopedic operation of the spine [9]. However, the difference and superiority among these 3D descriptors in describing the 3D features of spinal deformity have not been fully studied. Some techniques have been develope
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