TITLE

The Location of Femoral and Tibial Tunnels in Anatomic Double-Bundle Anterior Cruciate Ligament Reconstruction Analyzed by Three-Dimensional Computed Tomography Models

AUTHOR(S)
Forsythe, Brian; Kopf, Sebastian; Wong, Andrew K.; Martins, Cesar A.Q.; Anderst, William; Tashman, Scott; Fu, Freddie H.
PUB. DATE
June 2010
SOURCE
Journal of Bone & Joint Surgery, American Volume;Jun2010, Vol. 92-A Issue 6, p1418
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Characterization of the insertion site anatomy in anterior cruciate ligament reconstruction has recently received increased attention in the literature, coincidingwith a growing interest in anatomic reconstruction. The purpose of this study was to visualize and quantify the position of anatomic anteromedial and posterolateral bone tunnels in anterior cruciate ligament reconstruction with use of novel methods applied to three–dimensional computed tomographic reconstruction images. Methods: Careful arthroscopic dissection and anatomic double–bundle anterior cruciate ligament tunnel drilling were performed with use of topographical landmarks in eight cadaver knees. Computed tomography scans were performed on each knee, and three–dimensional models were created and aligned into an anatomic coordinate system. Tibial tunnel aperture centers were measured in the anterior–to–posterior and medial–to–lateral directions on the tibial plateau. The femoral tunnel aperture centers were measured in anatomic posterior–to–anterior and proximal–to–distal directions and with the quadrant method (relative to the femoral notch). Results: The centers of the tunnel apertures for the anteromedial and posterolateral tunnels were located at a mean (and standard deviation) of 25% ± 2.8% and 46.4% ± 3.7%, respectively, of the anterior–to–posterior tibial plateau depth and at a mean of 50.5% ± 4.2% and 52.4% ± 2.5% of the medial–to–lateral tibial plateau width. On the medial wall of the lateral fémoral condyle in the anatomic posterior–to–anterior direction, the anteromedial and posterolateral tunnels were located at 23.1% ± 6.1% and 15.3% ± 4.8%, respectively. The proximal–to–distal locations were at 28.2% ± 5.4% and 58.1 ± 7.1%, respectively. With the quadrant method, anteromedial and posterolateral tunnels were measured at 21.7% ± 2.5% and 35.1% ± 3.5%, respectively, from the proximal condylar surface (parallel to the Blumensaat line), and at 33.2% ± 5.6% and 55.3% ± 5.3% from the notch roof (perpendicular to the Blumensaat line). lntraobserver and interobserver reliability was high, with small standard errors of measurement. Conclusions: This cadaver study provides reference data against which tunnel position in anterior cruciate ligament reconstruction can be compared in future clinical trials. Clinical Relevance: This study may help surgeons to evaluate tunnel position and facilitate anatomic tunnel placement in anterior cruciate ligament reconstruction.
ACCESSION #
51403995

 

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