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Conference Paper: The learning curve effect in magnetically controlled growing rod distraction monitoring by ultrasound
Title | The learning curve effect in magnetically controlled growing rod distraction monitoring by ultrasound |
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Authors | |
Issue Date | 2016 |
Publisher | Hong Kong Orthopaedic Association. |
Citation | The 36th Annual Congress of the Hong Kong Orthopaedic Association (HKOA 2016), Hong Kong, 5-6 November 2016. In Programme & Abstracts, 2016, p. 93, abstract no. 7.11 How to Cite? |
Abstract | INTRODUCTION: Radiographs are the gold standard for monitoring of distraction lengths for magnetically controlled growing rod (MCGR) treatment. However, ultrasound is a radiation-free alternative. This study aimed to determine if a learning curve exists for this purpose. METHODS: Consecutive patients undergoing MCGR insertion and ultrasound measurements from 15 October 2013 to 31 March 2015 were prospectively recruited. Data regarding date of the distraction visit, and the interval radiograph and ultrasound measurements of the distracted lengths were collected. The change in both radiograph and ultrasound measurements was plotted to determine clusters of correlation differences with time. Comparison was made by paired t test. RESULTS: A total of 22 patients with 140 distraction episodes were recorded. The mean differences between ultrasound and radiograph measurements per distraction episode was -0.3 mm for right rod and -0.1 mm for left rod. The correlation in the first cluster (15 October 2013 to 16 October 2013) was 0.612 (right rod) and 0.795 (left rod), the second cluster (16 October 2013 to 20 May 2014) was 0.879 (right rod) and 0.918 (left rod), and the third cluster (20 May 2014 to 31 March 2015) being 0.956 (right rod) and 0.932 (left rod). Thus, the second cluster was where the correlation plateaus which translated to 48 to 73 rod measurements by ultrasound. CONCLUSION: Although initial use of ultrasound may require radiographic confirmation, with time and experience, ultrasound measurements can be more reliable. Ultrasound and radiographic measurements correlate in general but are even more compatible after measuring 48 to 73 patients. |
Description | Conference Theme: Hip Journey - Discover & Recover S225. Free Paper Session 7 - Paediatric Orthopaedics and Paediatric Spine: no. 7.11 |
Persistent Identifier | http://hdl.handle.net/10722/236467 |
DC Field | Value | Language |
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dc.contributor.author | Cheung, JPY | - |
dc.contributor.author | Yiu, KL | - |
dc.contributor.author | Bow, HYC | - |
dc.contributor.author | Samartzis, D | - |
dc.contributor.author | Cheung, KMC | - |
dc.date.accessioned | 2016-11-25T00:53:49Z | - |
dc.date.available | 2016-11-25T00:53:49Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | The 36th Annual Congress of the Hong Kong Orthopaedic Association (HKOA 2016), Hong Kong, 5-6 November 2016. In Programme & Abstracts, 2016, p. 93, abstract no. 7.11 | - |
dc.identifier.uri | http://hdl.handle.net/10722/236467 | - |
dc.description | Conference Theme: Hip Journey - Discover & Recover | - |
dc.description | S225. Free Paper Session 7 - Paediatric Orthopaedics and Paediatric Spine: no. 7.11 | - |
dc.description.abstract | INTRODUCTION: Radiographs are the gold standard for monitoring of distraction lengths for magnetically controlled growing rod (MCGR) treatment. However, ultrasound is a radiation-free alternative. This study aimed to determine if a learning curve exists for this purpose. METHODS: Consecutive patients undergoing MCGR insertion and ultrasound measurements from 15 October 2013 to 31 March 2015 were prospectively recruited. Data regarding date of the distraction visit, and the interval radiograph and ultrasound measurements of the distracted lengths were collected. The change in both radiograph and ultrasound measurements was plotted to determine clusters of correlation differences with time. Comparison was made by paired t test. RESULTS: A total of 22 patients with 140 distraction episodes were recorded. The mean differences between ultrasound and radiograph measurements per distraction episode was -0.3 mm for right rod and -0.1 mm for left rod. The correlation in the first cluster (15 October 2013 to 16 October 2013) was 0.612 (right rod) and 0.795 (left rod), the second cluster (16 October 2013 to 20 May 2014) was 0.879 (right rod) and 0.918 (left rod), and the third cluster (20 May 2014 to 31 March 2015) being 0.956 (right rod) and 0.932 (left rod). Thus, the second cluster was where the correlation plateaus which translated to 48 to 73 rod measurements by ultrasound. CONCLUSION: Although initial use of ultrasound may require radiographic confirmation, with time and experience, ultrasound measurements can be more reliable. Ultrasound and radiographic measurements correlate in general but are even more compatible after measuring 48 to 73 patients. | - |
dc.language | eng | - |
dc.publisher | Hong Kong Orthopaedic Association. | - |
dc.relation.ispartof | Annual Congress of the Hong Kong Orthopaedic Association, HKOA 2016 | - |
dc.relation.ispartof | 香港骨科醫學會第三十六屇週年會議 | - |
dc.rights | Annual Congress of the Hong Kong Orthopaedic Association, HKOA 2016. Copyright © Hong Kong Orthopaedic Association. | - |
dc.title | The learning curve effect in magnetically controlled growing rod distraction monitoring by ultrasound | - |
dc.type | Conference_Paper | - |
dc.identifier.email | Cheung, JPY: cheungjp@hku.hk | - |
dc.identifier.email | Yiu, KL: kyiu@hku.hk | - |
dc.identifier.email | Bow, HYC: cbow@hku.hk | - |
dc.identifier.email | Samartzis, D: dspine@hku.hk | - |
dc.identifier.email | Cheung, KMC: cheungmc@hku.hk | - |
dc.identifier.authority | Cheung, JPY=rp01685 | - |
dc.identifier.authority | Samartzis, D=rp01430 | - |
dc.identifier.authority | Cheung, KMC=rp00387 | - |
dc.identifier.hkuros | 270578 | - |
dc.identifier.spage | 93, abstract no. 7.11 | - |
dc.identifier.epage | 93, abstract no. 7.11 | - |
dc.publisher.place | Hong Kong | - |