I'm two weeks post-op. I had bilateral Austin bunionectomy, neuromas and gastroc recession (slide) done on both legs. My understanding of this procedure is that the tendon connecting the gastrocnemius muscle and the soleus muscle is cut to allow the foot to dorsiflex more normally and allow less forefoot impact during the gait cycle. I'm sure there are probably other reasons for doing the procedure.
I was surprised at the amount of discomfort post surgery, but it's getting much better now. If I could stretch more I'm sure this wouldn't be a problem, my mobility is limited because of the boots I'm wearing. The incisions are about 3 inches long just below mid-calf.
One thing that is of minor concern for me is the numbness on the side of my left leg about level with the incision extending down along my left foot. Doc says he had to "stretch" the nerve to get to the tendon. He says this will go away in time and I'll have full feeling. He's done a great job with all the other "stuff" I had done, so I have no reason to doubt what he's telling me. I'm not experiencing this with my right foot.
Here's a website I found when I plugged in "gastroc recession" in the Google search engine.