My left ankle broke 2 years ago. And when I run now, it cracks all the time, and my left shin can go numb or hurt. The more I go run more setbacks.?

Depends. If your ankle fracture resulted in widening of your ankle joint it can cause wearing of the cartilage. Thinning it out causing ankle joint to collapse. X-rays can assess this. Because of instability it can cause stress on the shin and posterior tibial tendon. You may need to be measured for orthotics to stabilize your ankle. If arthritic you may bike or swim or do elliptical machine.