Biodegradable magnesium Herbert screw – image quality and artifacts with radiography, CT and MRI

BMC Medical Imaging

Research Article

Lena Sonnow¹  Christian von Falck¹  Frank Wacker¹  Peter M. Vogt²  Sören Könneker² 

[1] Department of Diagnostic and Interventional Radiology, 30625, Hannover, Germany;Department of Plastic, Hand and Reconstructive Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany;

关键词: Magnesium Alloy;    Hallux Valgus;    Artifact Reduction;    Compression Screw;    Metal Artifact Reduction;   

DOI  :  10.1186/s12880-017-0187-7

 received in 2016-08-09, accepted in 2017-02-03,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundMagnesium alloys have recently been rediscovered as biodegradable implants in musculoskeletal surgery. This study is an ex-vivo trial to evaluate the imaging characteristics of magnesium implants in different imaging modalities as compared to conventional metallic implants.MethodsA CE-approved magnesium Herbert screw (MAGNEZIX®) and a titanium screw of the same dimensions (3.2x20 mm) were imaged using different modalities: digital radiography (DX), multidetector computed tomography (MDCT), high resolution flat panel CT (FPCT) and magnetic resonance imaging (MRI). The screws were scanned in vitro and after implantation in a fresh chicken tibia in order to simulate surrounding bone and soft tissue. The images were quantitatively evaluated with respect to the overall image quality and the extent and intensity of artifacts.ResultsIn all modalities, the artifacts generated by the magnesium screw had a lesser extent and were less severe as compared to the titanium screw (mean difference of artifact size of solo scanned screws in DX: 0.7 mm, MDCT: 6.2 mm, FPCT: 5.9 mm and MRI: 4.73 mm; p < 0.05). In MDCT and FPCT multiplanar reformations and 3D reconstructions were superior as compared with the titanium screw and the metal-bone interface after implanting the screws in chicken cadavers was more clearly depicted. While the artifacts of the titanium screw could be effectively reduced using metal-artifact reduction sequences in MRI (WARP, mean reduction of 2.5 mm, p < 0.05), there was no significant difference for the magnesium screw.ConclusionsMagnesium implants generate significantly less artifacts in common imaging modalities (DX, MDCT, FPCT and MRI) as compared with conventional titanium implants and therefore may facilitate post-operative follow-up.

【 授权许可】

CC BY   
© The Author(s). 2017