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Research Papers

Mapping of Contributions From Collateral Ligaments to Overall Knee Joint Constraint: An Experimental Cadaveric Study

[+] Author and Article Information
Adam J. Cyr

Bioengineering Graduate Program,
University of Kansas,
1530 W. 15th Street, Learned Hall,
Lawrence, KS 66044
e-mail: acyr@ku.edu

Sami S. Shalhoub

Bioengineering Graduate Program,
University of Kansas,
1530 W. 15th Street, Learned Hall,
Lawrence, KS 66044
e-mail: sss015@ku.edu

Fallon G. Fitzwater

Department of Mechanical Engineering,
University of Kansas,
1530 W. 15th Street,
Lawrence, KS 66044
e-mail: ffitzwat@ku.edu

Lauren A. Ferris

Department of Mechanical Engineering,
University of Kansas,
1530 W. 15th Street,
Lawrence, KS 66044
e-mail: lferris@ku.edu

Lorin P. Maletsky

Department of Mechanical Engineering,
University of Kansas,
1530 W. 15th Street,
Lawrence, KS 66044
e-mail: maletsky@ku.edu

1Corresponding author.

Manuscript received June 23, 2014; final manuscript received February 3, 2015; published online March 25, 2015. Assoc. Editor: Tammy L. Haut Donahue.

J Biomech Eng 137(6), 061006 (Jun 01, 2015) (7 pages) Paper No: BIO-14-1289; doi: 10.1115/1.4029980 History: Received June 23, 2014; Revised February 03, 2015; Online March 25, 2015

Understanding the contribution of the soft-tissues to total joint constraint (TJC) is important for predicting joint kinematics, developing surgical procedures, and increasing accuracy of computational models. Previous studies on the collateral ligaments have focused on quantifying strain and tension properties under discrete loads or kinematic paths; however, there has been little work to quantify collateral ligament contribution over a broad range of applied loads and range of motion (ROM) in passive constraint. To accomplish this, passive envelopes were collected from nine cadaveric knees instrumented with implantable pressure transducers (IPT) in the collateral ligaments. The contributions from medial and lateral collateral ligaments (LCL) were quantified by the relative contribution of each structure at various flexion angles (0–120 deg) and compound external loads (±10 N m valgus, ±8 N m external, and ±40 N anterior). Average medial collateral ligament (MCL) contributions were highest under external and valgus torques from 60 deg to 120 deg flexion. The MCL showed significant contributions to TJC under external torques throughout the flexion range. Average LCL contributions were highest from 0 deg to 60 deg flexion under external and varus torques, as well as internal torques from 60 deg to 110 deg flexion. Similarly, these regions were found to have statistically significant LCL contributions. Anterior and posterior loads generally reduced collateral contribution to TJC; however, posterior loads further reduced MCL contribution, while anterior loads further reduced LCL contribution. These results provide insight to the functional role of the collaterals over a broad range of passive constraint. Developing a map of collateral ligament contribution to TJC may be used to identify the effects of injury or surgical intervention on soft-tissue, and how collateral ligament contributions to constraint correlate with activities of daily living.

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References

Figures

Grahic Jump Location
Fig. 1

(a) Photo of the IPT and relative size (dimensions in millimeter, obtained with permission from Precision Measurement Company). (b) Example placement of an IPT in the superficial fibers of the anterior MCL.

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Fig. 2

Experimental setup. With the femur fixed to a base plate, loads were applied through an analog foot and 6DOF load cell fixed to the distal tibia. Motion tracking arrays attached to the femur and tibia provided spatial bone orientations.

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Fig. 3

UE quadrants in knee position space as defined by pure peak loads in VrVl (horizontal plane) and IE (vertical plane) across all flexion angles. The quadrants are defined as follows: (1) valgus/external, (2) valgus/internal, (3) varus/internal, and (4) varus/external.

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Fig. 4

UE in joint orientation space for 100% isosurface, colored with average (a–c) and significant (d–f) MCL contribution. Average colors represent average level or normalized MCL constraint under (a) 0 N AP, (b) 40 N anterior, and (c) 40 N posterior force. For significance figures, red (light) regions correspond with statistically significant MCL contribution greater than 0% (H0 = 0, p  <  0.05) for (d) 0 N AP, (e) 40 N anterior, and (f) 40 N posterior force. In all figures, the UE ranges from 0 to 120 deg flexion.

Grahic Jump Location
Fig. 5

UE in joint orientation space for 100% isosurface, colored with average (a–c) and significant (d–f) LCL contribution. Average colors represent average level or normalized LCL constraint under (a) 0 N AP, (b) 40 N anterior, and (c) 40 N posterior force. For significance figures, red (light) regions correspond with statistically significant LCL contribution greater than 0% (H0 = 0, p < 0.05) for (d) 0 N AP, (e) 40 N anterior, and (f) 40 N posterior force. In all figures, the UE ranges from 0 to 120 deg flexion.

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