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AJR Am J Roentgenol. 2016 Apr;206(4):810-6. doi: 10.2214/AJR.15.15252. Epub 2016 Feb 2.

Association of Medial Meniscus Extrusion With the Prominence of a Fascicular Capsulofemoral Band Subjacent to the Deep Medial Collateral Ligament.

Author information

1
1 Department of Radiology, Hacettepe University School of Medicine, Sihhiye, 06100 Ankara, Turkey.
2
2 Department of Orthopedics and Traumatology, Koç University School of Medicine, Sariyer, Istanbul, Turkey.
3
3 Department of Radiology, American Hospital, Nişantaşı, Istanbul, Turkey.
4
4 Department of Anatomy, Hacettepe University School of Medicine, Sihhiye, Ankara, Turkey.
5
5 Department of Pathology, Hacettepe University School of Medicine, Sihhiye, Ankara, Turkey.

Abstract

OBJECTIVE:

The objective of our study was to test our hypothesis that a transverse oblique fascicular anteromedial capsulofemoral band partially subjacent to the deep medial collateral ligament (MCL) is more prominent in knees with medial meniscal extrusion.

MATERIALS AND METHODS:

We retrospectively analyzed all knee MRI examinations from a 6-month period for the presence and dimensions of the anteromedial capsulofemoral band on coronal proton-density fat-saturated images and also for medial meniscus extrusion, which was defined as extrusion of 3 mm or greater. Edemalike signal intensity within or in the vicinity of the anteromedial capsulofemoral band, partial or complete tears of the MCL, a history of MCL surgery, or a neoplastic mass lesion violating the medial supporting structures were exclusion criteria. We reviewed procedural videos of patients who subsequently underwent knee arthroscopy. MRI of a cadaveric knee was performed and was followed by dissection and histologic examination.

RESULTS:

MRI examinations of 346 knees of 312 patients met the inclusion criteria; of these knees, 50 had medial meniscus extrusion. The anteromedial capsulofemoral band was discernible on MRI in all knees except five (98.6%), and it was visible in six of the arthroscopy videos of 17 knees. The anteromedial capsulofemoral band was thicker on MRI of patients with medial meniscus extrusion (p < 0.0001). The anteromedial capsulofemoral band was identified on MRI and at dissection of the cadaveric knee, and histologic examination revealed that the anteromedial capsulofemoral band was a capsuloligamentous structure.

CONCLUSION:

A transverse oblique anteromedial capsulofemoral band subjacent to the deep MCL is thicker in knees with medial meniscus extrusion.

KEYWORDS:

MRI; dissection; knee; medial collateral ligament; menisci

PMID:
27003050
DOI:
10.2214/AJR.15.15252
[Indexed for MEDLINE]

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