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Characterization of the orientation and isometry of Humphrey's ligament

Michael B Cross, Bradley S Raphael, Travis G Maak, Christopher Plaskos, Claus Christoph Egidy & Andrew D Pearle

abstract

OBJECTIVES/PURPOSE
The purpose of this study was to examine the effect of flexion angle on isometry and fiber obliquity of the anterior meniscofemoral ligament (Humphrey's ligament (HL)).

METHODS
Following a medial parapatellar arthrotomy on 7 fresh frozen cadavers, the insertion points of the anterolateral (AL) and posteromedial (PM) bundles of the PCL, and HL were identified. Using a 9mm circular software tool, virtual fibers were created. Within each virtual graft, a central fiber was calculated and used to generate anisometry profiles for the AL and PM bundles and HL at flexion angles of 0°, 30°, 60°, 90°, and 120°. Previously validated computer navigation software was used to re-create three dimensional bundles to measure fiber obliquity in the sagittal, frontal, and axial planes.

RESULTS
HL length increased with knee flexion from 0 to 120°, and underwent similar length changes as the PCL bundles. In full extension and at 90°, the average length of the PM and AL bundles were not statistically different (p=0.13 and p=0.85 respectively). From 0 to 120°, the PM bundle was the most isometric, but the anisometry profile was statistically similar to the AL bundle and HL. In general, HL and the PM bundle had similar graphic trends in terms of fiber obliquity in all planes.

CONCLUSIONS
Using computer navigation, we have demonstrated that HL has similar isometry profiles as the PM and AL bundles of the PCL, and "mirrored" the obliquity of the PM bundle in all planes throughout flexion to 120°.
   
citation Cross M B, Raphael B S, Maak T G, Plaskos C, Egidy C C, Pearle A D. Characterization of the orientation and isometry of Humphrey's ligament. Knee 2013; 20:515-9.
   
type journal paper/review (English)
date of publishing 06-05-2013
journal title Knee (20/6)
ISSN electronic 1873-5800
pages 515-9
PubMed 23659994
DOI 10.1016/j.knee.2013.04.002