I recommend the following to help convergence.
Use more elements through the thickness. A minimum of 4 linear elements should be used through the thickness. There are several places where there is only one element across the thickness.
Add Keyop(6)=1 to the Meniscus because that material is close to incompressible with a Poisson's Ratio of 0.49
Add Keyop(6)=1 to the Cartilage because that material is close to incompressible with a Poisson's Ratio of 0.45
Consider using Hyperelastic Material model for the Cartilage because that material has a low Young's Modulus.
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