It is important to partly remove the torn area of the meniscus otherwise it will cause major arthritis very fast. However more meniscus you remove, more are the chances of future arthritis; though lesser than what you get if you don't remove the torn part. 

An experienced surgeon will try to be just right and not over-enthusiast in removing the torn area. Of course, if the tear is reparable, then one must repair it and not remove it.

http://www.ncbi.nlm.nih.gov/pubmed/25390473

SO Team

#SaumyaOrthocare