Not sure why you need a fully healed ankle to show your serve.
My ankle has torn tendons, I have not run in over 7 years, and my serve still is fast enough to trouble anyone short of a real solid 5.5 when it goes in, first or second. Second almost always goes in. First maybe 35% if I'm hitting full speed.
Lol? By trouble do you mean like...."damn, I'm not sure which corner I want to smash this return into?"