Which tools I should use in Solidworks to model Cartilages ?

It would help if you could include a picture of the type of thing you want to model.

Ehsan,

Organic/freeform modeling in SolidWorks is time consuming. It is possible by generating curves and then using boundary surfaces and fills, but it may not be cost effective for your work.

Some other applications (Geomagic, Rapidform, and others) will take 3D scan data and construct an organic nurbs model without building all the curves and surfaces as you would need to do in SolidWorks. Its not automatic, but it can be a lot faster.

There is a plugin for SolidWorks called PowerSurfacing, which allows for construction and editing of a nurbs model based on a simplified representation.

I believe a concern here would be in how much deviation you get from the reference model or 3D scan to the nurbs surface, since it is not doing an exact fit. You would have to determine a way to measure the deviation of the nurbs model to the original 3D scan or medical imaging data if it is relevant.

The scan to surface applications like Geomagic or Rapidform typically give you the ability to see how much the nurbs surface varies from the scan data.