Compartment syndrome surgeries are not THAT common, but are getting a little more common now that more DPM's are obtaining ER privileges and ER on call schedules.
Compartment syndrome cases often are diagnosed after/during trauma and are therefore diagnosed in the ER, and as a result were often referred to the orthopedic staff or trauma surgeons. That trend has started to have a very slight swing in some progressive hospitals, depending on podiatry's relationship in that hospital and their delineation of privileges.
In PA we can perform fasciotomies of the leg compartments. I have also found that in hospitals that have residency programs and podiatric residents that rotate through the ER it's much more likely that DPM's will be involved.
There are also cases of exercise induced compartment syndrome that are more chronic than acute that can be treated and actually scheduled as a non emergent surgery.
I believe that as a general rule, surgery for compartment syndrome is not that common, nor is surgery for soft tissue procedures of the leg. Yes, there are the occasional lumps and bumps and Achilles work, but the vast majority of your cases will be the foot, followed by the ankle.
Don't worry, there's plenty of work.