title: MR imaging of the anatomy of the anterior horn of the medial meniscus.
abstract: Background In cadaveric and arthroscopic studies different insertion locations of the anterior horn of the medial meniscus (AHMM) have been described. Purpose To investigate if the different insertion locations of the AHMM, as described in cadaveric studies, can be determined on magnetic resonance imaging (MRI). Material and Methods MR images of 100 patients without meniscal tears on MRI were retrospectively evaluated. Two observers classified the AHMM insertion based on its position relative to the anterior tibial edge and the medial tibial spine. The association between AHMM insertion and tibial plateau slope, meniscal radial displacement, and anterior intermeniscal ligament (AIL) presence was investigated. Results The AHMM inserted posterior to the anterior tibial edge in 93 knees and anterior to the tibial edge in seven knees (= type III). Of the 93 knees with AHMM insertion posterior to the anterior tibial edge, 63 inserted lateral to the medial tibial spine (= type I) and 30 medial (= type II). The AHMMs inserting anterior to the tibial edge had a significantly ( P < 0.05) steeper anterior tibial plateau slope and a significantly ( P < 0.05) higher presence of the AIL. No significant difference in radial displacement was observed between the three insertion types ( P > 0.05). A strong inter- and intra-observer agreement was observed. Conclusion Three different bony insertion locations of the AHMM, as described in cadaveric studies, could be identified on MRI. All AHMMs inserting anterior to the tibial edge displayed an AIL. Whether there is a clinical correlation with these insertion patterns remains unclear.
authors.affiliation: 1 Department of Radiology, Ghent University Hospital, Ghent, Belgium.
authors.forename: Tineke
authors.initials: T
authors.lastname: De Coninck
authors.affiliation: 2 Department of Radiology, AZ Groeninge, Kortrijk, Belgium.
authors.forename: Frederik
authors.initials: F
authors.lastname: Vanrietvelde
authors.affiliation: 2 Department of Radiology, AZ Groeninge, Kortrijk, Belgium.
authors.forename: Patrick
authors.initials: P
authors.lastname: Seynaeve
authors.affiliation: 3 Faculty of Medicine Ghent University, Ghent, Belgium.|4 Antwerp Orthopedic Center, Monica Hospitals, Antwerp, Belgium.
authors.forename: Peter
authors.initials: P
authors.lastname: Verdonk
authors.affiliation: 1 Department of Radiology, Ghent University Hospital, Ghent, Belgium.
authors.forename: Koenraad
authors.initials: K
authors.lastname: Verstraete
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008592:Menisci, Tibial / Q000033:anatomy & histology*; D008875:Middle Aged; D012016:Reference Values; D012189:Retrospective Studies
keywords: anatomy; knee; magnetic resonance imaging; meniscus