Biomechanical comparison between 2 guided-growth constructs

Journal of Pediatric Orthopedics
Andrea StitgenKenneth J Noonan

Abstract

Correction of deformity using guided growth with plate and screw constructs has shown good results in the correction of angular deformities in children. Some recent reports have shown device failure, perhaps because of increased patient weight as seen in Blount disease. The purpose of our study was to compare the strength to failure between 2 similar devices, the Orthofix 8-plate manufacturer 1 (M-1) and Biomet Peanut plate manufacturer 2 (M-2), using 2 different screw types: solid and cannulated. A model of bone was developed using 30-pcf solid polyurethane foam as cancellous bone and high-density polyethylene as cortical bone. A 10.0-mm defect was created through the polyurethane foam and was spanned by a plate and screw system. Under the assumption that device failure is caused by cyclical loading, each device underwent fatigue testing on an MTS Bionix machine with a 4-Hz micromotion of 5.0 mm at -500-N compression, and the number of cycles to failure was recorded. All devices failed at the screw shaft; plates did not break under any circumstances. The highest mean number of cycles to failure was seen with the M-2 device using solid, stainless-steel screws (22,614 cycles; SD, 6885). On comparing with titanium screws, solid s...Continue Reading

References

Apr 7, 2007·Journal of Pediatric Orthopedics·Peter M Stevens
Dec 23, 2008·Journal of Pediatric Orthopedics·Samuel SchroerluckeFrederick O Gregg
Aug 25, 2010·Journal of Pediatric Orthopedics·Rolf D BurghardtJohn E Herzenberg

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Citations

Dec 2, 2014·The Orthopedic Clinics of North America·Sanjeev Sabharwal
Jun 18, 2016·Journal of Children's Orthopaedics·Muayad KadhimJohn E Herzenberg
Jul 13, 2016·Journal of Pediatric Orthopedics·Yong-Woon ShinDaniel W Green
Nov 3, 2015·Journal of Pediatric Orthopedics·Anna E B ClementKenneth J Noonan
Aug 12, 2017·Journal of Pediatric Orthopedics·Samir Sabharwal, Sanjeev Sabharwal
Dec 11, 2013·Journal of Pediatric Orthopedics. Part B·Scott J SchoenleberShawn C Standard
Dec 1, 2020·The Journal of International Medical Research·Jing DingPin-Quan Shen

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