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ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

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attached cases this value was higher than for the fully attached case, but the<br />

magnitude was much higher for the horns section attachment (2.79 MPa) case than for<br />

the tips attachment case.<br />

Fully<br />

attached<br />

Horn<br />

section<br />

attached<br />

Tips<br />

attached<br />

Max<br />

simulation<br />

time (sec)<br />

Meniscal<br />

displacement<br />

(mm)<br />

Meniscal<br />

Effective<br />

Stress<br />

(Mpa)<br />

Meniscal<br />

Max Shear<br />

Strain<br />

Max Femoral<br />

displacement<br />

(mm)<br />

ACL 1<br />

Principal<br />

Stress<br />

(Mpa)<br />

Femoral<br />

cartilage<br />

Max Shear<br />

Stress (Mpa)<br />

0.04 0.0594 5.81 0.0135 14.5 28.2 0.22<br />

0.07 0.46 22.81 0.0512 19.8 16.9 2.79<br />

0.05 2.21 38.8 0.0754 25.8 15.9 0.786<br />

Table 2: Maximum values for the outputs for each case scenario.<br />

Figure 3: ACL 1 Principal Stress (first left), femoral cartilage Shear Stress in patellar contact (second<br />

left), meniscal total displacement (centre right), and femoral total displacement (last right) at the end of<br />

the simulations, for menisci fully attached (top row), menisci partially attached at a section under the<br />

horns (centre row), and menisci attached at nodes of the tips (bottom row).<br />

A similar result was obtained for the maximum simulation time, which increased in<br />

both partially attached cases but was higher for the horns attachment case (0.07 sec)<br />

than for the tips attached case (0.05 sec). From the color maps on Figure 3, each of<br />

which correspond to the last time step, different changes can be observed. The ACL<br />

first principal stress is more distributed across the whole section in both sliding<br />

contact cases, compared to the menisci fully attached case, where the stress was much<br />

higher and concentrated on one corner of the tibial attachment. The patello-femoral

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