A retrospective study on the effectiveness of capod CAD/CAM system for patients with adolescent idiopathic scoliosis

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A retrospective study on the effectiveness of capod CAD/CAM system for patients with adolescent idiopathic scoliosis


Author: Chiu, Sun-wang
Title: A retrospective study on the effectiveness of capod CAD/CAM system for patients with adolescent idiopathic scoliosis
Year: 2004
Subject: Hong Kong Polytechnic University -- Dissertations
Scoliosis -- Patients -- Rehabilitation
CAD/CAM systems
Department: Jockey Club Rehabilitation Engineering Centre
Pages: xi, 54 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1781042
URI: http://theses.lib.polyu.edu.hk/handle/200/1809
Abstract: Scoliosis is a 3-dimenional deformity of spine. If untreated, it may affect the trunk balance, cosmetic appearance of the body and cardiopulmonary function. For Adolescent Idiopathic Scoliosis (AIS) patients with Cobb's angle between 21o and 45o, spinal orthosis is usually prescribed until skeletal maturity. For the conventional method, Plaster of Paris (POP) bandages are used to get the contour of the patient's body. The CAD/CAM system to prosthetics and orthotics has been developed over two decades. It is a series of automated processes from scanning or digitizing of body shape, to fabrication of positive model by numerical controlled milling machine. A CAD/CAM system was set up in the Department of Prosthetics and Orthotics, Prince of Wales Hospital in Hong Kong at the end of 1998. The aims of this study were to assess the effectiveness of spinal orthoses, the work flow time of making spinal orthoses and learning time of clinicians with the CAD/CAM approach implemented in Prince of Wales Hospital. One hundred and forty-seven clinical records of scoliotic patients were collected for the comparison between the conventional method and the CAD/CAM method. The results showed that significant decreases were found in Cobb's angles when comparing to the pre-brace data. Significant decrease was also found in apical vertebral rotation in the conventional method. However, no significant difference was found on the trunk listing for the two methods. The productivity of spinal orthosis was found to be 275% higher in the CAD/CAM method than that of the conventional method in the studied period. Regarding the learning time, clinicians became more familiar with the technique of application of the CAD/CAM method to make spinal orthoses in a few years. Significant decreases were found in the learning time except the number of time of scanning when comparisons were made between 1999 and the following three years. As the CAD/CAM method can obtain similar clinical results in comparison with the conventional method, it can be considered to substitute the conventional method in making of spinal orthoses for AIS patients.

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