Évaluation volumétrique de l’extrusion dans les déchirures des racines postérieures du ménisque médial par segmentation semi-automatique des images IRM 3 teslas - 09/08/20

Volumetric assessment of extrusion in medial meniscus posterior root tears through semi-automatic segmentation on 3-tesla magnetic resonance images

Doi : 10.1016/j.rcot.2020.06.003

Changwan Kim ^a, Seong-Il Bin ^a, Bum-Sik Lee ^a, Won-Joon Cho ^b, June-Goo Lee ^c, Gi-Woon Yoon ^a, Jong-Min Kim ^a,^⁎
^a Department of Orthopaedic Surgery, College of Medicine, Asan Medical Center, University of Ulsan, Seoul, République de Corée
^b Department of Orthopaedic Surgery, Bonbridge Hospital, Seoul, République de Corée
^c Biomedical Engineering Research Center, College of Medicine, Asan Medical Center, Asan Institute for Life Sciences, University of Ulsan, Seoul, République de Corée

^⁎Auteur correspondant.

Sous presse. Épreuves corrigées par l'auteur. Disponible en ligne depuis le Sunday 09 August 2020
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Abstract

Background

Many reports have described the relationship between medial meniscus posterior root tears (MMPRTs) and meniscal extrusion on coronal magnetic resonance (MR) images. However, volumetric assessment of meniscal extrusion has not been performed, and the correlation between extrusion length and volume remains unclear.

Hypothesis

Extrusion in both length and volume would be greater in MMPRTs than that in the normal medial meniscus, and the extrusion length measured on coronal MR images would be correlated with the extrusion volume.

Patients and methods

A total of 20 knees who underwent isolated MMPRTs without trauma history were included in the MMPRT group, and another 20 knees with normal medial meniscus were selected as the control group. All 40 knees underwent 3-tesla MR imaging. The extrusion length of the medial meniscus was measured using coronal MR images only. Volumetric assessments of the meniscus were performed and analyzed via a semi-automatic segmentation. Group-wise comparisons of the extrusion length and volumetric values were conducted, and the correlation between the two measures in both groups was evaluated.

Results

The mean extrusion length of the medial meniscus in the MMPRT group was significantly longer (2.60 versus 0.63mm; p<0.001) than that in the control group. The mean extrusion volume was also significantly higher in the MMPRT than that in the control group (770.93 versus 193.80mm³; p<0.001). The extrusion length was significantly and positively correlated with the extrusion volume in both groups (R=0.64; p=0.002 in MMPRT, R=0.73; p<0.001 in the control group).

Discussion

Semi-automatic segmentation was used to measure the volume of meniscal extrusion, which had previously only been estimated indirectly with the extrusion length on coronal MR images. MMPRTs significantly increased the extrusion in both measures. The extrusion length measured on coronal MR images was positively correlated with the extrusion volume in both groups.

Level of evidence

III, case-control study.

IRB information

Project No. 2018-0286, AMC IRB SOP.

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Keywords : Meniscus, Medial meniscus posterior root tears, Extrusion, Segmentation

☆	Cet article peut être consulté in extenso dans la version anglaise de la revue Orthopaedics & Traumatology: Surgery & Research sur Science Direct (sciencedirect.com) en utilisant le DOI ci-dessus.