Fixation Stability and Stiffness of Two Implant Systems for Proximal Femoral Varization Osteotomy

Kerstin Radtke,Peter Paes,Michael Schwarze,Fabian Goede,Bastian Welke,Max Ettinger

doi:10.3390/app10175867

Kerstin Radtke, Peter Paes + Show 4 more

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https://doi.org/10.3390/app10175867

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Journal: Applied sciences	Publication Date: Aug 25, 2020
Citations: 4	License type: CC BY 4.0

Affiliation: Hannover Medical School

Abstract

Proximal femoral varization osteotomy is a well-established surgical procedure in children with severe hip problems. This study aimed to evaluate the fixation stability and stiffness of two new implant systems. A biomechanical testing model was created with a total of 12 synthetic femora. Proximal femoral varization osteotomy was performed in every femur, and the synthetic femora were fixed with two different implant systems (PediLoc Locking Proximal Femur Plate System versus PediLoc Locking Cannulated Blade Plate System; OrthoPediatrics, Warsaw, IN, USA). The average torsional stiffness of the locking plate group was higher than for the cannulated blade plate group. Differences in internal and external rotations were seen between the two groups, but they were not significant. Using the tested implants in severe osteoporotic bones might show other results. Therefore, it might be helpful to use the locking plate system in osteoporotic bones and in cases of revision operations where stability is of critical focus.

Highlights

Proximal femoral varization osteotomy is a well-established surgical procedure in children with different hip problems, such as developmental dysplasia of the hip (DDH), containment in Perthes disease, and hip dislocation or subluxation in severe cerebral palsy (CP) [1,2,3,4,5,6,7,8,9]
This study aimed to evaluate fixation stability and stiffness of two new implant systems
All synthetic femora could be tested for axial torsion without causing damage

Summary

Introduction

Proximal femoral varization osteotomy is a well-established surgical procedure in children with different hip problems, such as developmental dysplasia of the hip (DDH), containment in Perthes disease, and hip dislocation or subluxation in severe cerebral palsy (CP) [1,2,3,4,5,6,7,8,9]. Older implant systems had higher complication rates and longer time to bone union [8]. To simplify the procedure and to stabilize the fixation, new blade plate systems were developed [9]. Given the low complication rates and postoperative mobilization under full weight bearing, fixed-angle blade plates became the most used implant over time [2,4,5,6]. Clinical studies with the new implant systems comparing blade plate and screw-side plate show generally good results [2,10,11,12]. Jain et al described a rate of implant-related fractures of 2.5% in all patients, and they found no significant difference between the blade plate and screw-side plate [11]

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