Micro‑scale assessment of the postoperative effect of anterior cruciate ligament reconstruction preclinical study using a 7.1T micro‑magnetic resonance imaging

Chai,Fang; Wan,Fang; Jiang,Jia; Chen,Shiyi

doi:10.3892/etm.2018.6080

Micro‑scale assessment of the postoperative effect of anterior cruciate ligament reconstruction preclinical study using a 7.1T micro‑magnetic resonance imaging

Authors:
- Fang Chai
- Fang Wan
- Jia Jiang
- Shiyi Chen
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Affiliations: Department of Orthopedics, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310003, P.R. China, Department of Sports Medicine and Arthroscopic Surgery, Huashan Hospital, Sports Medicine Center, Fudan University, Shanghai 200040, P.R. China
Published online on: April 19, 2018 https://doi.org/10.3892/etm.2018.6080
Pages: 214-220
Copyright : © Chai et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY 4.0].

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Abstract

High‑field micro‑magnetic resonance imaging (MRI) scanning may provide additional information for quantitative analysis of graft bone healing processes, thus serving as a promising supplementary method in graft and bone healing evaluation following anterior cruciate ligament reconstruction (ACLR) surgery during preclinical studies. The present study included 12 New Zealand white rabbits that underwent ACLR with polyethylene terephthalate (PET) ligament. At 4, 8, and 16 weeks following surgery, 4 rabbits were euthanized and knee joint samples were harvested for a 7.1T micro‑magnetic resonance imaging (MRI) scan. The graft bone tunnel diameter and signal noise ratio (SNR) at the region of interest (ROI) were measured. Hematoxylin‑eosin staining was performed at each time point to verify the graft bone healing process in histology. The bone tunnel diameter at the graft tunnel interface decreased over time in both femoral and tibial parts. Notably, the tunnel size was smaller than the diameter of the drilling Kirschner wire that was used to observe the femoral part and proximal site of the tibial part at 16 weeks following surgery. SNR research demonstrated that both the femoral and tibial part PET ligaments selected in the ROI exhibited a marked increase in SNR from the initial 4‑week results. The micro‑MRI result was consistent with that of histological analysis. Micro‑MRI scanning was applied in an animal model that underwent ACL reconstruction surgery with PET ligament, and it was determined that micro‑MRI is promising in quantitatively observing graft bone healing processes directly with a focus on graft tunnel distances and SNRs.

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