Whether you train crossfit, powerlifting or bodybuilding (or anything for that matter), you primarily train bilateral movements. Is this a bad thing? Absolutely not!
Bilateral movements include almost all of the seven primal movements:
EVERYONE HAS ARTHRITIS!
Osteoarthritis is a form of degenerative change in joints. It's a matter of load vs. capacity. When the load in a joint is too high, for too long, the joint wears down. Simply put, it's the wearing down of the protective tissue in joints.