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Research Papers

Cartilage Strain Distributions Are Different Under the Same Load in the Central and Peripheral Tibial Plateau Regions

[+] Author and Article Information
Paul Briant

Mem. ASME
Stanford University,
496 Lomita Mall,
Durand Building 204 MC: 4040,
Stanford, CA 94305;
149 Commonwealth Drive,
Menlo Park, CA 94025
e-mail: pbriant@exponent.com

Scott Bevill

Mem. ASME
Colorado Mesa University,
1100 North Avenue,
Grand Junction, CO 81501
e-mail: sbevill@coloradomesa.edu

Thomas Andriacchi

Stanford University,
496 Lomita Mall,
Durand Building 227 MC: 4040,
Stanford, CA 94305
e-mail: tandriac@stanford.edu

1Corresponding author.

Manuscript received May 31, 2015; final manuscript received October 16, 2015; published online November 6, 2015. Assoc. Editor: Tammy L. Haut Donahue.

J Biomech Eng 137(12), 121009 (Nov 06, 2015) (7 pages) Paper No: BIO-15-1271; doi: 10.1115/1.4031849 History: Received May 31, 2015; Revised October 16, 2015

There is increasing evidence that the regional spatial variations in the biological and mechanical properties of articular cartilage are an important consideration in the pathogenesis of knee osteoarthritis (OA) following kinematic changes at the knee due to joint destabilizing events (such as an anterior cruciate ligament (ACL) injury). Thus, given the sensitivity of chondrocytes to the mechanical environment, understanding the internal mechanical strains in knee articular cartilage under macroscopic loads is an important element in understanding knee OA. The purpose of this study was to test the hypothesis that cartilage from the central and peripheral regions of the tibial plateau has different internal strain distributions under the same applied load. The internal matrix strain distribution for each specimen was measured on osteochondral blocks from the tibial plateau of mature ovine stifle joints. Each specimen was loaded cyclically for 20 min, after which the specimen was cryofixed in its deformed position and freeze fractured. The internal matrix was viewed in a scanning electron microscope (SEM) and internal strains were measured by quantifying the deformation of the collagen fiber network. The peak surface tensile strain, maximum principal strain, and maximum shear strain were compared between the regions. The results demonstrated significantly different internal mechanical strain distributions between the central and peripheral regions of tibial plateau articular cartilage under both the same applied load and same applied nominal strain. These differences in the above strain measures were due to differences in the deformation patterns of the collagen network between the central and peripheral regions. Taken together with previous studies demonstrating differences in the biochemical response of chondrocytes from the central and peripheral regions of the tibial plateau to mechanical load, the differences in collagen network deformation observed in this study help to provide a fundamental basis for understanding the association between altered knee joint kinematics and premature knee OA.

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Figures

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Fig. 4

Representative strain distributions calculated from the displacement fields for (a) the peripheral region and (b) the central region

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Fig. 3

Comparison of estimated initial collagen orientation (solid lines) and deformed collagen orientation (X-marked lines) for (a) peripheral and (b) central region specimens

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Fig. 2

Deformed matrix orientation traced on SEM image. Deformed cartilage can be viewed under the arrow, which was directly loaded by the indenter. Images across the entire specimen were obtained and combined to form a single panorama using the position data from the SEM.

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Fig. 1

Location of peripheral (dotted) and (dashed) specimen harvest location and freeze fracture plane (long dashed)

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Fig. 5

Bending deformation pattern in the central region in (a) full thickness view and (b) higher magnificent image near surface

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Fig. 6

Peripheral low-load specimen under load. (a) Full thickness profile and (b) zoom-in at deep/transitional zone interface. No bending occurred during loading.

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Fig. 7

Comparison of strain components under same applied load (a) and same applied nominal strain (b). The central region tended to have higher strains under same load and same nominal strain. The dashed lines on each bar show the average precision error associated with the initial position estimation for each region.

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