• Yangmin Lin, CheungJason Pui YinJPYDepartment of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong SAR, People's Republic of China., Chi Kwan Chan, Sidney Wing Fai Wong, CheungKenneth Man CheeKMCDepartment of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong SAR, People's Republic of China., Martin Wong, Wun Ching Wong, CheungPrudence Wing HangPWHDepartment of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong SAR, People's Republic of China., and Man Sang Wong.
• Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China.
• Spine. 2022 Jan 1; 47 (1): 132013-20.

Study DesignProspective randomized controlled trial.ObjectiveTo compare clinical effectiveness and quality of life (QoL) of the 3D-printed orthosis (3O) and conventional orthosis (CO) for adolescent idiopathic scoliosis (AIS).Summary Of Background DataUsing 3D printing technology to design and fabricate orthoses to manage AIS aiming to improve in-orthosis correction and patients' compliance that are considered essential factors of effective treatment. Clinical evaluation was conducted to study the effectiveness of this innovative method.MethodsThirty females with AIS who met the criteria (age 10-14, Cobb 20-40°, Risser sign 0-2, ≤12 months after menarche) were recruited. Subjects were randomly allocated to the 3O group (n = 15, age 12.4, Cobb 31.8°) and CO group (n = 15, age 12.0, Cobb 29.3°). All patients were prescribed for full-time wearing (23 hours/d) and follow-up every 4 to 6 months until bone maturity. Compliance was monitored by thermosensors, while QoL was assessed using three validated questionnaires.ResultsComparable immediate in-orthosis correction was observed between 3O (-11.6°, P < 0.001) and CO groups (-12.9°, P < 0.001). In the QoL study via SRS-22r, the 3O group got worse results after 3 months in aspects of function, self-image, and mental health (-0.5, -0.6, -0.7, P < 0.05) while the CO group had worse results in aspects of self-image and mental health (-0.3, -0.3, P < 0.05). No significant difference was found in QoL assessments between groups. After 2 years of follow-up, 22 patients were analyzed with 4 dropouts in each group. Comparable angle reduction was observed in both groups (3O: -2.2°, P = 0.364; CO: -3.5°, P = 0.193). There was one subject (9.1%) in the 3O group while two subjects (18.2%) in the CO group had curve progression >5°. Daily wearing hours were 1.9 hours longer in the 3O group than the CO group (17.1 vs. 15.2 hours, P = 0.934).ConclusionThe 3O group could provide comparable clinical effects as compared with the CO group while patients with 3O showed similar compliance and QoL compared to those with CO.Level of Evidence: 1.Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.

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